VOLUME II TECHNICAL SPECIFICATIONS

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Technical Specifications for 12 kV Three Phase Outdoor Auto Recloser

VOLUME II

TECHNICAL SPECIFICATIONS

PART 2 – Additional Technical Specifications for

Distribution Line and Test Equipment

1 TECHNICAL SPECIFICATIONS FOR 12 kV THREE PHASE

OUTDOOR AUTOMATIC CIRCUIT RECLOSER (AUTO

RECLOSER

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2 TECHNICAL SPECIFICATIONS FOR 12 kV THREE PHASE

OUTDOOR SECTIONALIZER / LOAD BREAK SWITCH

Page 21

3 TECHNICAL SPECIFICATION FOR MEDIUM VOLTAGE

OVERHEAD LINE FAULT PASSAGE INDICATOR

Page 40

4 TECHNICAL SPECIFICATIONS FOR CABLE FAULT LOCATION

AND TEST VAN

Page 52

5 TECHNICAL SPECIFICATIONS FOR 12 kV MOTORIZED RING

MAIN UNITS (RMU

Page 61

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SPECIFICATION NO : TSE-D-001

TECHNICAL SPECIFICATIONS FOR

12 kV THREE PHASE OUTDOOR AUTOMATIC

CIRCUIT RECLOSER (AUTO RECLOSER)

Rev : R0: 07/2020

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TECHNICAL SPECIFICATION FOR 12 kV THREE PHASE OUTDOOR AUTO RECLOSER

CONTENTS

1.0

Scope

2.0

System Parameters

3.0

Service Conditions

4.0

Applicable Standards

5.0

Technical Requirements

6.0

Quality Assurance

7.0

Manufacturing Experience

8.0

Spares

9.0

Training

10.0

Warranty

11.0

Technical Literature and Drawings

12.0

Inspection and Testing

13.0

Information to be Furnished by the Bidder

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TECHNICAL SPECIFICATION FOR 12 KV THREE PHASE OUTDOOR AUTO RECLOSER

1.0 SCOPE

This specification covers the general requirements of design, manufacture, testing and supply of 12

kV Three Phase Outdoor Auto Recloser to be used in 11 kV power distribution lines.

2.0 SYSTEM PARAMETERS

Parameter 11kV System

Nominal Voltage 11kV

Highest System Voltage 12kV

Number of Phases 3

Frequency 50Hz

Neutral Earthing Effectively earthed

3 Phase Short Circuit Levels 12.5 kA

Duration of Short Circuit 1sec

Impulse Withstand Voltage 75 kV (peak)

Power Freq. Withstand Voltage 1 min 28 kV

3.0 SERVICE CONDITIONS

Parameter Value

Max. Ambient Temperature 45 oC

Max. Daily average ambient temp. 35 oC

Min Ambient Temp 0 oC

Maximum Humidity 95%

Minimum Humidity 55%

Maximum altitude above M.S.I. Upto 1000 Meter

Average Annual rainfall 2400 mm.

Isokeraunic (thunder days) level 85 days

Maximum wind speed 55 m/s

(Very high damage risk zone A)

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4.0 APPLICABLE STANDARDS

Unless otherwise specified herein, all equipment shall be designed, manufactured and supplied

in accordance with the relevant current IS and IEC Standards including all amendments.

IEC/ISO IS Subject

IEC 62271-111 :2012

High-voltage switchgear and controlgear - Part 111:

Automatic circuit reclosers and fault interrupters for

alternating current - systems up to 38 kV

IEC:62271-100 & 200

IS: 13118 High voltage alternating current circuit breakers general requirement.

IEC: 694 IS: 12729 Common clauses of high voltage switch-gear and control gear standards (for voltage exceeding 1000 V).

IEC: 60060 - 2 IS: 9135 High Voltage testing techniques.

IEC: 427 IS: 13516 Method of synthetic testing of HV .A.C circuit breakers.

IEC: 1233 HV. AC. Circuit breakers- inductive load switching.

IEC: 17A/CD:474 HV. AC. Circuit breakers- capacitive switching.

IEC: 529 IS: 13947 Degree of protection provided by enclosure.

IEC: 137 IS: 2099 Insulating bushing for A.C. voltages above 1000V

IEC 60815 Selection and dimensioning of high-voltage insulators intended for use in polluted conditions

IEC: 233 IS : 5621 Hollow insulators for use in electrical equipment & testing.

IEC 262217 Polymeric HV insulators for indoor and outdoor use – General definitions, test methods and acceptance criteria.

IEC: 273 IS: 5350 Characteristics of indoor and outdoor post insulators for systems with nominal voltages greater than 1000V.

IEC: 815 IS: 13134 Guide for selection of insulators in respect of polluted conditions.

IEC 60255-149 Measuring relays and protection equipment - Part 149 - Functional requirements for thermal electrical relays

ISO: 1460 BS: 729 IS: 2629 Hot dip galvanizing

IEC: 61869 IS: 2705 Current transformers.

IEC: 61869 IS: 3156 Potential transformers

IEC 60870-5- 101 & 104

Telecontrol equipment and systems - Part 5-101 & 104

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5.0 TECHNICAL REQUIREMENTS

5.1 General

The Recloser shall be used in HT overhead power distribution lines to provide programmable reclosing cycles to clear transient faults. It shall also be used in coordination with the downstream Sectionalizers to isolate sections of permanent faults.

5.2 Design and Performance Criteria

The Recloser shall have rated characteristics and design features as detailed in Table 1 and be able to operate with minimum maintenance and suit the conditions stated in clause 3.0. Any conflicts between Table 1 and the rest of this document, Table 1 has precedence.

Table 1 : Recloser Design and Performance Criteria

Design and Performance Criteria for 12 kV Three Phase Outdoor Auto-Recloser

Rated voltage kV 12

Frequency Hz 50

No. of Phases - Three

Rated Normal Continuous current A 630

Mechanical Endurance - Class M2

Electrical Endurance Class E3

Rated Short Circuit Performance

Rated short-circuit breaking current (RMS) kA 12.5

Short Time Withstand Current (1 Sec) kA 12.5

Rated short-circuit making current (Peak) kA 31

Insulation level

Rated lightning impulse withstand voltage

kVpk 75

Rated short-duration power-frequency withstand voltage, wet (1min.)

kV 28

Insulator Creepage Distance mm 300

Recloser Design

Insulation Medium Solid dielectric (HCEP) (Hydrophobic Cycloaliphatic Epoxy )

Operating Chamber

The Recloser shall have self-contained reclosing chamber/s for each phase including operating mechanism

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Interruption Medium Vacuum only.

Operating Mechanism

All three poles shall be simultaneously operated through magnetic actuator mechanism.

Instrument Transformers / Sensors

Current Transformer / Sensor CT sets for each phase to measure phase currents and enable protection schemes.

Voltage Transformer / Sensor

VT / Voltage sensor sets for each phase to measure voltage, enable protection schemes including over / under voltage settings.

Accuracy of measurements Current: ±1% Voltage : ±1%

Opening/ Closing / Locking and Tripping

Tripping Tripping shall be initiated as per protection schemes specified below.

Automatic Switching Schemes

At least four O-CO-CO-CO switching cycles with individually selectable dead times as per IEC 62271.

Manual Locking / Unlocking

Manual locking / unlocking facility by means of a liver mechanism operated using operating rod from ground level. In lock position all operations shall be disabled and Recloser shall be in open position. Lock and unlock positions shall be clearly visible from ground.

Protection Schemes

Frequency Protection

The over and under frequency upto 5 Hz

above / below the system frequency in steps of 0.1 Hz shall be provided. Auto-close

function shall be provided to close upon

returning to normal frequency from tripping due to over/ under frequency.

Voltage Protection

Over / Under voltage trip settings in steps of

1% of nominal system voltage shall be provided for 100% - 150% (overvoltage) and

50% - 100% (under voltage).

Overcurrent and Earth Fault Operation Characteristics

Instantaneous, Standard inverse, Very inverse, Extreme inverse as per IEC60255.

Over Current Setting Range 25% - 150 % of the rated current with

minimum resolution of 1A.

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Earth fault Setting Range 5% to 50 % of rated current with minimum resolution of 1A.

Sensitive earth fault setting range 0.5% to 8% of the rated current of the current transformer with minimum resolution of 0.5 A.

Protection Profiles

Facility to incorporate protection profiles shall be made available for defined overcurrent protection and operation settings.

Cold Load Pickup (CLPU)

Cold Load Pickup (CLPU) facility to prevent the control from tripping due to short-term increases in current caused by loss of normal load diversity based on operational cold load time and user set parameters.

Inrush Restraint Provision Facility toapply user set timing and inrush restraint multiplier for overcurrent protection.

High Current Lockout

Facility for direct Recloser lockout for a sustained current condition above the user set high current lockout level. The Recloser shall not reclose under this condition and provide indication and signals.

Dead time setting range 0. 5 to 120sec.

Reclaim time setting range 5 sec. to 180 sec.

5.3 Use of Equipment Recloser shall be of three phase outdoor type, suitable for installation on single pole on 11 kV

power distribution lines in order to provide successive (programmable) reclosing to clear or

isolate short circuit and earth faults downstream of the line. It may also be used at 33/11 kV

substations in order to provide protection and switching functionality for 11 kV feeders.

5.4 Design and Construction 5.4.1 Three phase Auto-Recloser shall be provided as a single unit with solid insulation (

hydrophobic cycloaliphatic epoxy (HCEP)) bushings with integrated Vacuum Interrupter,

integrated instrument transformers / sensors and stainless steel base tank housing operating

mechanism, complete with stainless steel Control Cubicle and all other components and

cables necessary for installation and operation.

5.4.2 All three poles of the Auto Recloser shall be operated simultaneously via magnetic

actuator (spring) mechanism.

5.4.3 Auto Recloser lockout shall be clearly indicated with Open/Close positions. This indicator

shall be light reflecting Open/Close position indicator so, that the position of the switch

can be clearly seen from the ground even under bad weather conditions. It shall be

possible to manually trip the Auto Recloser which will trip the same to lockout position

and disable Recloser sequence until it is closed again. Provision shall be made to

achieve the manual tripping by pressing a trip button on the control panel or by a manual

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control lever or by a remote operator via modem interface.

5.4.4 Mechanical and electrical Endurance of Auto Recloser shall be 10,000 or more in/out

operations. Auto Recloser operations shall be recorded by a mechanical or electrical

counter which can be accessed in the field via control panel display unit and field

computer using the associated computer software package.

5.4.5 All non-metal parts including insulating materials of cables shall be able to withstand

effects due to ultra violet radiation.

5.4.6 The Recloser shall have a separate button on the control panel to lock and unlock

reclosing action manually in case of live line maintenance work is done at the

downstream of the power line.

5.4.7 The Auto Recloser shall be provided with suitable Pole Mounting Steel Frame with Lifting

Tackle, Surge Arrester Mounting Brackets on the both source and load side.

5.4.8 Earthing terminal suitable to accommodate two Nos. 5mm diameter to 15 mm diameter

earthing conductors shall also be provided for bonding the Auto Recloser base tank, mounting frame and the surge arrester earth terminal to the local earthing electrodes .

5.4.9 Tripping shall be initiated by overcurrent, earth fault and instantaneous relays. The type

of overcurrent, earth fault and sensitive earth relays and their operating current/time

setting ranges shall conform to the protection schemes specified in Table 1. In addition

frequency and voltage protections shall be provided as specified.

5.4.10 The automatic switching schemes shall comply with requirements specified in Table 1.

5.5 Vacuum Interrupters

The vacuum interrupters shall be of a reputed make with proven track record. The

vacuum interrupters shall be of proven and tested design that provide high fault-

interrupting capability, fast low energy arc interruption, minimum and even contact wear

and minimum heat generation.

Number of full load interruptions, full fault interruptions and number of half fault

interruption that could be performed by the interrupter during its life span shall be

furnished. Remaining percentage contact wear shall be recorded in the Auto Recloser

and shall indicate in the control panel.

5.6 Operating Mechanism

The Recloser operating mechanism shall be 3-phase gang operated. It shall consist of

a bi-stable magnetic actuator capable of fast opening and closing operations with no

recharging delay. Bi-stable refers to that no operating power is required to hold the unit

open or closed. Close and trip capacitors shall be used to store the necessary energy

for operating the magnetic actuator. The magnetic actuators shall be of reputed make with

proven track record.

5.7 Insulation

The Recloser bushings shall use Hydrophobic Cycloaliphatic Epoxy (HCEP) as the

dielectric insulating medium and be highly resistant to ozone, oxygen, moisture,

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contamination and ultraviolet light. No coatings or UV protective covers are acceptable.It

shall provide high resistance to damage. The hydrophobic cycloaliphatic epoxy shall

provide complete encapsulation of the internal vacuum interrupter. The encapsulation

shall also be completely bonded to the source and load side bushing terminals. The

Recloser bushings shall be designed utilizing alternating minor and major skirts to

increase creepage distance.

5.8 Control and Protection

5.8.1 All protection settings and the reclosing pattern shall be configurable by both control

panel and a computer which is connected remotely or locally. A minimum of four (04)

tripping operations to lockout shall be provided and the number and sequence of operations to lockout shall be adjustable in the field.

5.8.2 The applicable over current tripping shall be of the instantaneous, standard inverse, very

inverse and extreme inverse types as per IEC 60255-149 and the tripping current/time

delay setting range shall be as stipulated in Clause 5.2. Inrush restraint, CLPU and High Current Lockout facilities shall be also provided. The tripping current/time delay setting

range for earth fault and sensitive earth fault tripping shall be as stipulated in Table 1.

5.8.3 If the fault is cleared by any one of the Auto Recloser operations and the Auto Recloser

remains closed, it shall reset itself for another complete sequence of operations. The reset time shall be adjustable from 5-180sec.

5.8.4 The successful bidder shall be responsible to set auto-recloser protection curve settings

in field so as to coordinate with other upstream breakers and fuses to ensure that only the faulty section downstream of the Aauto- Recloser will be isolated in the event of a

permanent fault. In case Automatic Sectionalizers are used downstream of the Recloser

successful bidder must ensure that Automatic Sectionalizers are coordinated with Reclosing cycles are coordinated with the to isolate only the faulty section of the line.

The successful bidder shall provide proposed scheme for coordination of the protective

and sectionalizing devices for respective for approval of the Project Manager prior to

implementation in field. 5.9 Control Cabinet

5.9.1 The Recloser shall be supplied with Control Cabinet with an integrated microprocessor based control and protection system incorporating all control and protection features

specified in this specification.

5.9.2 Control cabinet shall have a display panel with backlit LCD and keypad to provide

navigation and local control. Navigation keys shall be able to disable with password

protection. Navigation menus should be presented in easily understandable text for the

operators. Basic configurations can be carried out using navigation keys and LCD display. It shall also be possible to read instantaneous current, voltage, power and

system logs values through LCD display.

5.9.3 The control system shall have facilities for data logging of network parameters such as

current, voltage, active power, reactive power, energy, Instantaneous Measurements in the events of operation of Auto Recloser, change of network configuration, power interruptions and restorations etc

5.9.4 The control cabinet shall be provided with auxiliary power supply, battery system and

battery charging system as specified in clause 5.11 (Auxiliary Supply)

5.9.5 The enclosure of the control cabinet shall have IP 54 or higher rating. Cabinet shall be

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designed for the specified service conditions, adequately ventilated and fitted with

substantial door securing devices capable of ensuring entry by only authorized personnel. Cabinet shall be adequately sealed and dust protected and shall be internally

treated to prevent moisture condensation.

5.9.6 The cabinet shall be designed for the service conditions specified, adequately ventilated

and fitted with substantial door securing devices capable of being padlocked by a

padlock with a shank of 8mm with the door in the closed position.

5.9.7 The equipment housed in the control cabinet shall withstand the heating effect of direct

solar radiation without causing failure and/or mal-operation.

5.9.8 The cabinet shall make provision for bottom entry of at least two additional cables. The

cabinet shall be pre-punched with at least one 21mm and one 32mm hole. The holes shall

be suitably blanked off. The cabinet shall be fitted with an external M12 earthing stud, with a nut, lock nut, and a serrated washer.

5.9.9 The control cabinet shall be mounted below the Recloser and shall be connected to the

Recloser switchgear by a minimum seven meter long multi-core control cable. The multi-core cable shall be ultra violet stabilized and adequately screened against electrostatic

and electromagnetic interference, which can cause malfunctioning of the protection or

control equipment. This cable shall connect into both the Recloser and the control

cabinet by means of plug and socket arrangements. Entry of the control cable into the Control Cubicle shall be from the bottom.

5.10 Software

5.10.1 It shall be possible to download data stored in control unit and configure the Recloser

settings using a portable computer locally or remotely. Interfacing should be via USB port.

5.10.2 Computer software compatible with Windows 7 or later to upload and download

protection settings, to provide history information (event data logs, load profile, etc) to

display breaker contact erosion data etc., shall be supplied. The software shall be

capable of connecting to control and protection system locally or remotely via

communication system. The protocol for data transfer shall be in accordance with 5.12.

5.10.3 The software should have the facility to install on any computer without a separate

license and record the event history to get the information of the access user. The

software should have separate authority levels for ;

Programming, Operating and Monitoring

Operating and Monitoring

Monitoring

5.10.4 The offered software should be backward-compatible with the previous version. A copy

of the manual of the software shall accompany the bid. Required one set of interface

cables shall be provided with every ten units or part thereof.

5.10.5 The downloaded data shall be stored in a suitable fool proof database. This data shall

be able to be extracted as a delimited text format or MS Excel format.

5.10.6 Software shall be valid or provided with necessary keys and upgrades for at least the

full life span of the equipment. The manufacturer/ supplier shall provide necessary

support throughout this period. The software should facilitate remote data downloading

individually from each equipment.

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5.11 Auxiliary Supply

5.11.1 Auxiliary supply for the operating mechanism and control cabinet of the Recloser shall

normally be from an internal sealed battery fitted with a charging system.

5.11.2 The battery system shall be capable of initiating correct operation of the Recloser including controls, protections and communications for not less than 3 days (at 6 operations per day)

after loss of ac auxiliary supply.

5.11.3 The battery system shall incorporate a battery test facility. The following features shall be

regarded as typical of the 'test' / 'monitoring' facilities required.

(a) Display of battery operating voltage, battery charge / discharge current.

(b) An alarm signal in the event of loss of the battery system or poor battery condition.

5.11.4 The charging system shall operate from a HT Voltage Transformer, incorporated into the installation. The Voltage Transformer for auxiliary supply shall be designed, manufactured

and tested in accordance with IEC 61869-3. It shall be provided with adequate capacity for

provision of auxiliary supply for operating mechanism, control cabinet including RTU and

communication equipment to be incorporated in the control cabinet in future.

It shall be suitable for mounting on the Recloser pole and supplied complete with a pole

mounting bracket. The auxiliary supply VT shall have a primary winding suitable for connecting to the 11 KV line and a secondary output voltage of 240V.

5.11.5 A 2A HRC fuse or a circuit breaker shall be provided in the secondary terminal box of the VT

to facilitate the isolation of the secondary wiring in the event of a fault.

5.11.6 A name plate marked with the following information shall be provided on the auxiliary VT:

Manufacturer’s name, serial number, rated impulse withstand level, primary and secondary

voltages, rated current.

5.12 Remote Control / SCADA

5.12.1 Auto Recloser shall have the facility to monitor and control remotely from Control Station

(future application). Provision for incorporating Remote Terminal Unit (RTU) with the

Controller shall be provided for this future application.

5.12.2 The incorporated Remote Terminal Unit (RTU) shall be compatible with GSM/ GPRS/

3G/4G or latest communication module that allows the Auto Recloser to communicate

over cellular network with remote server / PC and software supplied as per clause 5.10.

The communication protocol shall conform to DNP3.0, IEC 60870-5-101& 104 latest

versions. Any additional software for RTU / Communications shall be provided.

5.12.3 Following communication ports shall be provided for SCADA and local configuration.

RS232 (SCADA)

Ethernet RJ45 (SCADA)

USB (Local configuration)

5.12.4 The RTU shall communicate and shall allow for the processing of all analogue and digital

signals including inputs, outputs, measurements and alarms in order to monitor and

control the Auto Recloser remotely. The power supply for RTU shall be provided from

internal battery.

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5.12.5 Voltage detection on both sides of the opened switch shall be possible from the control

centre. The measurement of line parameters (line voltages: on both side of one phase,

phase currents) and maintenance information (such as retrieval of ‘Number of switching

operations performed’) shall be possible from the control center. Periodical, continuous

and on – request remote data acquisition modes shall be available.

5.12.6 The RTU shall be firmware upgradable.

5.12.7 The supply of RTU / communication module with the Recloser is optional. The BOQ may

however include supply of these equipment for limited number of Reclosers for testing

of remote monitoring and control. In such case the successful bidder is required provide

complete system solution including equipment and software for both device and server

ends to implement remote monitoring and control of the Recloser. 5.13 Rating Plate Markings

The ratings and data of the Auto Recloser shall be provided in the rating plate which

shall be weather and corrosion proof.

Rating plate shall be provided at the lower part of the base tank and shall consist

following information.

i) Manufacturer's name and trademark

ii) Type designation and serial number

iii) Standard adopted with the year and the edition

iv) Rated voltage, Basic Impulse and Power Frequency Withstand Levels

v) Rated continuous current and short time current with duration

vi) Year of manufacture

vii) Purchasers Name : TSECL

6.0 Quality Assurance

The manufacturer shall have an established quality assurance system in the process

of design, manufacture and testing of equipment. The bidder shall furnish related quality

system details and Quality Assurance Certifications such as ISO certifications, along

with the offer.

7.0 Manufacturing Experience

The manufacturer of Auto Recloser shall have minimum of 10 years of experience in

manufacturing similar products. The product offered shall have been in service in

electricity utilities over past 5 years.

The bidder shall furnish list of purchasers with year and quantity of the product offered

along with the bid to prove his manufacturing experience.

8.0 Spares

8.1 Mandatory Spares

The following mandatory spare parts shall be provided;

01 Nos Control Unit for every 10 Nos. of Reclosers or part thereof.

01 Nos auxiliary supply VT for every 10 Nos. of Reclosers or part thereof.

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8.2 Manufacturer Recommended Spare Parts

A list of manufacturers recommended spare parts with current prices for 5 year trouble

free operation and out maintenance of the Recloser shall be submitted along with the

bid.

In case special testing equipment and tools are required for testing and maintenance of the Recloser, such testing equipment and tools shall be supplied along with the Reclosers.

9.0 Training

The bidder shall provide training on the use of offered Recloser to nominated TSECL staffs through the Manufacturer. Training shall cover installation, operation and maintenance of the Recloser and its Control and Protection system. This should also include setting up parameters for protection and control.

10.0 Warranty

The Bidder shall warrant that all Goods supplied shall have no defect arising from

design, materials or workmanship or from any act or omission of the supplier, that may

develop under normal use of the supplied goods in the conditions as specified. This Warranty shall remain valid for twelve (12) months after the completion of the final

delivery.

In addition, three (3) years comprehensive warranty for electronic devices and cards in

the control panel shall be provided.

11.0 Technical Literature and Drawings

The successful bidder shall provide catalogues with all relevant drawings, technical

literature, calculations, operating manuals for equipment and software etc. required for

installation, operation, and maintenance of the equipment. The details shall cover the

main plant and all associated ancillary equipment and software as supplied under the

offer.

12.0 INSPECTION AND TESTING

The Auto-Recloser shall be subjected to routine and type tests in accordance with the

standards listed in this specification. The tests shall include but not limited to the following;

12.1 Type Tests

The following Certificates of type tests as per relevant IEC / IS standards shall be provided.

(a) Dielectric tests

(b) Making and breaking tests

(c) Short time withstand and peak withstand current tests

(d) Measurements of resistance of the main circuit

(e) Temperature raise tests

(f) Dimensional tests

(g) Surge current

(h) Temperature rise test

(i) Time current tests

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(j) Mechanical operation tests

(k) Control electronic elements surge withstand capability and EMI tests

(l) Accelerated weathering test in accordance with IEC 62217 (on bushing

Insulators).

Type test reports should be issued during period not exceeding 5 years from the bid

opening date. In case the type test reports are of the test conducted earlier than 5 (five)

years prior to the date of bid opening, the bidder shall repeat these test(s) at no extra

cost.

Type tests reports shall be from reputed independent CPRI / NABL accredited testing

laboratories in India or reputed international test laboratories accredited to ISO/IEC

17025:2005 for carrying out specified type tests. Proof of accreditation by a national/

international authority shall be forwarded with the offer. The test laboratories should be

acceptable to TSECL.

12.2 Routine Tests

The following Routine Tests in accordance with relevant IEC standards shall be carried

out on all units and test report shall be furnished for the observation of the Engineer

appointed by the purchaser at the time of inspection.

(a) Dielectric test on the main circuit

(b) Measurement of the resistance of the main circuit

(c) Tightness test

(d) Reclosing and overcurrent trip calibration

(e) Partial discharge test

(f) Mechanical operations tests

12.3 Inspection

The Successful bidder shall make necessary arrangements for inspection by TSECL

nominated representative and also to carry out in his presence necessary Acceptance

tests on the Recloser.

The successful bidder shall give reasonable notice of when the acceptance/sample /routine

tests are to be carried out. TSECL reserves the right to appoint representatives to witness

the tests as well as conduct design reviews, and periodic inspection of the Recloser during

manufacture.

12.4 Acceptance Tests The following Acceptance/Sample tests as per IEC 62271-111 or equivalent BIS standard shall be witnessed by the TSECL nominated representative;

(a) Control unit calibration checks, wiring, operating and functional tests

(b) Wiring and operating checks

(c) Dielectric withstand tests

(d) Mechanical operation checks

(e) Leakage check

(f) Temperature rise test

(g) Duty Cycle Tests

(h) Verification of remote operation with the software

(i) Dimensional tests

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13.0 INFORMATION TO BE FURNISHED BY THE BIDDER

The following shall be furnished with the offer.

(a) Catalogues describing the equipment - Recloser, Control Cabinet, Software and

Auxiliary supply VT.

(b) Literature describing the operational feature of the equipment.

(c) Constructional features, materials used for components and relevant technical

literature.

(d) The following drawings;

i) Overall dimensional drawing of the Auto Recloser including general

arrangement.

ii) Electrical clearance requirements of installation

iii) Insulator assembly and shed profile

iv) Dimensional drawing of mounting arrangement.

v) Name plate to scale, incorporating the particulars called for.

(e) Manufacturing experience in accordance with clause 7.0

(f) List of Manufacturer Recommended Spare Parts with current prices as per

clause 8.2.

(g) Copies of type test reports as per clause 12.1

(h) Quality Assurance Certification as per clause 6.0.

(i) Completed schedule of guaranteed technical particulars and schedule of

deviations.

Failure to furnish the above information may result in the offer being rejected.

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GUARANTEED TECHNICAL PARTICULARS

12 kV Three Phase Outdoor Auto Recloser

# Parameter Offered

1. Name and address of the Manufacturer

2. Country of Origin

3. Model No

4. Type

i. Indoor/out door

ii. Insulation media

iii. Interruption media

iv Operating mechanism

v. Number of phases

5. Rated voltage kV

6. Rated continuous current A

7. Rated frequency Hz

8. Rated Short Circuit

Rated duration of short-circuit s

Rated short-circuit breaking current (Isc) kA

Rated short-circuit making current (Ima) kA

9. X/R ratio

10. Insulation level

Impulse withstand voltage (1.2/50 s) kVpk


kV

Creepage distance, phase-to-earth mm

Clearance, phase-to-phase mm

11. Type of Operating mechanism

i. Closing

ii. Tripping

12 Vacuum Interrupters

i. Make and Model

ii. Country of Origin

13. Magnetic Actuators

i. Make and Model


14. Protections and Control

i. Over Current operation characteristics provided

ii. Over current setting range

iii. Inrush Restraint, CLPU and High Current Lockout features provided ?

v. Earth fault operation characteristic

vi. Std. earth fault current setting range

vii. Sensitive earth fault setting range

viii. Frequency protection as specified?

ix. Voltage protection as specified?

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# Parameter Offered

x. No of sequential tripping operations to lockout

xi. Dead time setting range

xii. Reclaim time setting range

15. Electrical Endurance

16. Mechanical Endurance

17 Control Cabinet

Enclosure material

Enclosure IP Rating

Provisions for local control and display as specified

Provision for housing RTU / Com. modules

Provision of auxiliary supply via separate VT (IEC 61869-3)

18 Battery Supply

i. Type of Battery

ii. Sealed and maintenance free ?

iii. Service life time (yrs)

iv. No of Recloser operations without auxiliary supply

v. Display and low battery voltage signal

vi. Battery hold-up time (hrs)

19 Instrument Transformers (inside bushings)

CT Make and Model

CT Ratio

CT Accuracy

Secondary Amps of the CT

VT Make and Model

Secondary voltage of the VT

20. Material of;

i. Control unit housing / cubicle

ii. Operating mechanism housing

21. Whether the following accessories are provided;

i. Pole steel mounting bracket(s)

ii. Surge arrester mounting brackets on source and load side of Auto-Recloser

iii. Lifting tackle

iv. Earthing terminal

v. Applicable earth conductor size

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# Parameter Offered

ix. Rating plate provided?

22 Whether the provision for checking the remaining contact life of the interrupter is available

Whether a warning signal will be indicated when the remaining contact life of any phase reaches zero

23 Whether the Software for local / remote monitoring and control of Recloser is provided

24

Whether a controller with provision to incorporate RTU provided for remote control and communication functions

as specified

25 Whether the manufacturer recommended spare parts list provided

26 Whether the Tools are provided (if required) if so the quantity

26 Whether the Type Test Certificates as per Clause 12.1 furnished?

27 Whether the Quality Assurance details and Certification as per clause 6.0 provided?

28 Whether the experience records of the manufacturer as per clause 7,0 provided ?

29 Confirmation that training as per clause 9.0 will be provided

30 Warranty period for Recloser and associated equipment (Yrs)

31 Warranty period for electronic devices and cards (Yrs)

Signature ---------------------------------------------- Name : Date : Company Seal :

Page 20


SCHEDULE OF DEVIATIONS

12 kV Three Phase Outdoor Auto Recloser

# Clause No Details of deviation with justifications

We confirm that there are no deviation apart from those detailed above.

Signature

----------------------------------------------

Name :

Date :

Company Seal :

Page 21

Technical Specifications for 12 kV Three Phase Outdoor Sectionalizer / Load Break Switch



12 kV THREE PHASE OUTDOOR

SECTIONALIZER / LOAD BREAK SWITCH

Rev : R0: 07/2020

Page 22


TECHNICAL SPECIFICATION FOR 12 kV THREE PHASE OUTDOOR

SECTIONALIZER / LBS

CONTENTS

1.0

Scope

2.0

System Parameters

3.0

Service Conditions

4.0


5.0


6.0

Quality Assurance

7.0


8.0

Spares

9.0

Training

10.0

Warranty

11.0


12.0


13.0


Page 23


TECHNICAL SPECIFICATION FOR 12 KV THREE PHASE OUTDOOR

SECTIONALIZER / LBS

1.0 SCOPE

This specification covers the general requirements of design, manufacture, testing and supply of 12

kV Three Phase Outdoor Sectionalizer cum Load Break Switch (Sectionalizer / LBS) to be used

in 11 kV power distribution lines.





Number of Phases 3

Frequency 50Hz







Parameter Value











Page 24





IEC/ISO IS Title

IEC 62271-111 :2012

High-voltage switchgear and controlgear - Part 111:

Automatic circuit Sectionalizer / LBS and fault

interrupters for alternating current - systems up to 38

kV

IEC:62271-100 & 200

IS: 13118 High voltage alternating current circuit breakers general requirement.

IEC: 694 IS: 12729 Common clauses of high voltage switch-gear and control gear standards (for voltage exceeding 1000 V).

IEC: 60060 - 2 IS: 9135 High Voltage testing techniques.

IEC: 427 IS: 13516 Method of synthetic testing of HV .A.C circuit breakers.

IEC: 1233 HV. AC. Circuit breakers- inductive load switching.

IEC: 17A/CD:474 HV. AC. Circuit breakers- capacitive switching.

IEC: 529 IS: 13947 Degree of protection provided by enclosure.

IEC: 137 IS: 2099 Insulating bushing for A.C. voltages above 1000V

IEC 60815 Selection and dimensioning of high-voltage insulators intended for use in polluted conditions

IEC: 233 IS : 5621 Hollow insulators for use in electrical equipment & testing.

IEC 262217 Polymeric HV insulators for indoor and outdoor use – General definitions, test methods and acceptance criteria.

IEC: 273 IS: 5350 Characteristics of indoor and outdoor post insulators for systems with nominal voltages greater than 1000V.

IEC: 815 IS: 13134 Guide for selection of insulators in respect of polluted conditions.

IEC 60255-149 Measuring relays and protection equipment - Part 149 - Functional requirements for thermal electrical relays

ISO: 1460 BS: 729 IS: 2629 Hot dip galvanizing

IEC: 61869 IS: 2705 Current transformers.

IEC: 61869 IS: 3156 Potential transformers

Page 25


IEC/ISO IS Title

IEC 60870-5- 101 & 104

Telecontrol equipment and systems - Part 5-101 & 104


5.1 Functionality

The Sectionalizer / LBS will be used in the downstream of the Automatic Circuit Recloser to protect the medium voltage overhead lines by isolating (sectionalizing) the faulty sections / branches (spurs) of the line. The sectionalizing functionality shall facilitate operation in radial lines as specified below; The Sectionalizer / LBS will be used in radial lines where the power flows in one direction (forward direction). It will receive power from upstream side and coordinate with the upstream Recloser to isolate faults. The Sectionalizer will be in normally closed position and will open during the dead time of the specified count of the reclosing sequence upon detection of downstream overcurrent or earth fault. In addition to above, the Sectionalizing facility may be used for open ring and ring closing applications in future for interconnecting two feeders in open loop configuration to improve reliability. Therefore the Sectionalizer shall preferably facilitate these future applications with provision of appropriate modes of operation for respective applications. It addition Sectionalizer / LBS shall also be used as a load break switch (LBS) for manual switching operations of the power lines. In load breaking mode the automatic sectionalizing functionality should be disabled. 5.2 Design and Performance Criteria

The Sectionalizer / LBS shall have rated characteristics and design features as detailed in Table 1 and be able to operate with minimum maintenance and suit the conditions stated in clause 3.0. Any conflicts between Table 1 and the rest of this document, Table 1 has precedence. Table 1 : Sectionalizer / LBS Design and Performance Criteria

Design and Performance Criteria for 12 kV Three Phase Outdoor Sectionalizer / LBS

Rated voltage kV 12

Frequency Hz 50

No. of Phases - Three

Rated Normal Continuous current A 630

Mechanical Endurance - Class M2

Electrical Endurance - Class E3

Rated Short Circuit Performance

Rated breaking current (RMS) A 630

Short Time Withstand Current (1 Sec) kA 12.5

Page 26



Rated short-circuit making current (Peak) kA 31

Insulation level


kVpk 75


kV 28

Insulator Creepage Distance mm 300

Sectionalizer / LBS Design

Insulation Medium Solid dielectric (HCEP) (Hydrophobic Cycloaliphatic Epoxy )

Operating Chamber

The Sectionalizer / LBS shall have self-contained switching chamber/s for each phase including operating mechanism

Interruption Medium Vacuum only.

Operating Mechanism

All three poles shall be simultaneously operated through magnetic actuator mechanism.

Instrument Transformers / Sensors

Current Transformer / Sensor

CT sets for each phase to measure phase currents and detection of phase / earth faults.

Voltage Transformer / Sensor

VT / Voltage sensor sets for each phase on both sides to measure voltage and enable fault detection.

Accuracy of measurements Current: ±1% Voltage : ±1%

Opening/ Closing / Locking and Tripping

Sectionalizing

In sectionalizing mode Sectionalizer / LBS shall trip during the dead time of the specified count of reclosing sequence upon detection of downstream overcurrent or earth fault.

Sectionalizer / LBS shall be able to be closed onto a fault during fault restoration operation via local or remote control.

Load Breaking

In load breaking mode Sectionalizer / LBS shall be able to open or close via local or remote control. Automatic sectionalizing

Page 27



functionality should be disabled in this mode.

Manual Locking / Unlocking

Manual locking / unlocking facility by means of a liver mechanism operated using operating rod from ground level. In lock position all operations shall be disabled and Sectionalizer / LBS shall be in open position. Lock and unlock positions shall be clearly visible from ground.

Fault Detection and Sectionalizing

Fault Detection

The Sectionalizer / LBS shall be able to detect downstream phase and earth faults

based on the minimum actuating-current

levels set by the user. Upon fault detection,

shall trip during the dead time of the specified count of reclosing sequence.

Minimum actuating current

User shall be able to set values for minimum actuating current levels for phase and earth

faults.

Interruption Count and Reset

Sectionalizer / LBS shall record number of counts of Recloser close-open operations.

User shall be able to set the value for ‘counts to open’. Count reset should be

available and it shall be possible to set the

count reset times by the user.

Inrush-Current Restraint Feature

The inrush-current restraint feature shall

block the phase and ground actuating levels for specified period after line current passing

through the Sectionalizer / LBS to prevent

actuation due to inrush currents.

Response time

It shall be possible to set response time curve depending on the current level above

the minimum actuating current levels.

5.3 Use of Equipment Sectionalizer / LBS shall be of three phase outdoor type, suitable for installation on single pole

on 11 kV power distribution lines in order to provide sectionalizing and load breaking capability.

5.4 Design and Construction 5.4.1 Three phase Sectionalizer / LBS shall be provided as a single unit with solid insulation (

hydrophobic cycloaliphatic epoxy (HCEP)) bushings with integrated Vacuum Interrupter,

integrated instrument transformers / sensors and stainless steel base tank housing operating

mechanism, complete with stainless steel Control Cubicle and all other components and

cables necessary for installation and operation.

Page 28


5.4.2 All three poles of the Sectionalizer / LBS shall be operated simultaneously via magnetic

actuator (spring) mechanism.

5.4.3 Sectionalizer / LBS lockout shall be clearly indicated with Open/Close positions. This

indicator shall be light reflecting Open/Close position indicator so, that the position of the

switch can be clearly seen from the ground even under bad weather conditions. It shall

be possible to manually open the Sectionalizer / LBS which will trip the same to lockout

position and disable Sectionalizing sequence until it is closed again. Provision shall be

made to achieve the manual tripping by pressing a trip button on the control panel or by

a manual control lever or by a remote operator via modem interface.

5.4.4 Mechanical and electrical Endurance of Sectionalizer / LBS shall be 10,000 or more

in/out operations. Sectionalizer / LBS operations shall be recorded by a mechanical or

electrical counter which can be accessed in the field via control panel display unit and

field computer using the associated computer software package.

5.4.5 All non-metal parts including insulating materials of cables shall be able to withstand

effects due to ultra violet radiation.

5.4.6 The Sectionalizer / LBS shall be provided with suitable Pole Mounting Steel Frame with

Lifting Tackle, Surge Arrester Mounting Brackets on the both source and load side.

5.4.7 Earthing terminal suitable to accommodate two Nos. 5mm diameter to 15 mm diameter earthing conductors shall also be provided for bonding the Sectionalizer / LBS base tank,

mounting frame and the surge arrester earth terminal to the local earthing electrodes .

5.5 Vacuum Interrupters

The vacuum interrupters shall be of a reputed make with proven track record. The

vacuum interrupters shall be of proven and tested design that provide high fault-

interrupting capability, fast low energy arc interruption, minimum and even contact wear

and minimum heat generation.

Number of full load interruptions, rated fault closing operations that could be performed

by the interrupter during its life span shall be furnished. Remaining percentage contact

wear shall be recorded in the Sectionalizer / LBS and shall indicate in the control panel.

5.6 Operating Mechanism

The Sectionalizer / LBS operating mechanism shall be 3-phase gang operated. It shall

consist of a bi-stable magnetic actuator capable of fast opening and closing operations

with no recharging delay. Bi-stable refers to that no operating power is required to hold

the unit open or closed. Close and trip capacitors shall be used to store the necessary

energy for operating the magnetic actuator. The magnetic actuators shall be of reputed

make with proven track record.

5.7 Insulation

The Sectionalizer / LBS bushings shall use Hydrophobic Cycloaliphatic Epoxy (HCEP)

as the dielectric insulating medium and be highly resistant to ozone, oxygen, moisture,

contamination and ultraviolet light. No coatings or UV protective covers are acceptable.

It shall provide high resistance to damage. The hydrophobic cycloaliphatic epoxy shall

provide complete encapsulation of the internal vacuum interrupter. The encapsulation

Page 29


shall also be completely bonded to the source and load side bushing terminals. The

Sectionalizer / LBS bushings shall be designed utilizing alternating minor and major

skirts to increase creepage distance.

5.8 Fault Detection and Sectionalizing

5.8.1 The Sectionalizer / LBS shall be able to detect downstream phase and earth faults based

on the minimum actuating-current levels set by the user. Upon fault detection, shall trip during the dead time of the specified count of reclosing sequence

5.8.2 User shall be able to set values for minimum actuating current levels for phase and earth

faults.

5.8.3 Sectionalizer / LBS shall record number of counts of Recloser close-open operations.

User shall be able to set the value for ‘counts to open’. Count reset should be available

and it shall be possible to set the count reset times by the user.

5.8.4 The inrush-current restraint feature shall be available to block the phase and ground

actuating levels for specified period after line current passing through the Sectionalizer

/ LBS to prevent actuation due to inrush currents.

5.8.5 It shall be possible to set response time curve depending on the current level above the

minimum actuating current levels.

5.8.6 The successful bidder shall be responsible to establish settings for Sectionalizer / LBS

in order to ensure proper coordination with upstream Recloser and other sectionalizing

devices installed in the line. The successful bidder shall provide proposed scheme for

reclosing and sectionalizing of respective feeders for approval of the Project Manager prior to implementation in field.

5.9 Control Cabinet

5.9.1 The Sectionalizer / LBS shall be supplied with Control Cabinet with an integrated microprocessor based control system incorporating all control and fault detection

features specified in this specification.

5.9.2 Control cabinet shall have a display panel with backlit LCD and keypad to provide

navigation and local control. Navigation keys shall be able to disable with password

protection. Navigation menus should be presented in easily understandable text for the operators. Basic configurations can be carried out using navigation keys and LCD

display. It shall also be possible to read instantaneous current, voltage, power and

system logs values through LCD display.

5.9.3 The control cabinet shall be provided with auxiliary power supply, battery system and

battery charging system as specified in clause 5.11 (Auxiliary Supply)

5.9.4 The enclosure of the control cabinet shall have IP 54 or higher rating. Cabinet shall be designed for the specified service conditions, adequately ventilated and fitted with

substantial door securing devices capable of ensuring entry by only authorized

personnel. Cabinet shall be adequately sealed and dust protected and shall be internally treated to prevent moisture condensation.

5.9.5 The cabinet shall be designed for the service conditions specified, adequately ventilated

and fitted with substantial door securing devices capable of being padlocked by a

Page 30


padlock with a shank of 8mm with the door in the closed position.

5.9.6 The equipment housed in the control cabinet shall withstand the heating effect of direct

solar radiation without causing failure and/or mal-operation.

5.9.7 The cabinet shall make provision for bottom entry of at least two additional cables. The

cabinet shall be pre-punched with at least one 21mm and one 32mm hole. The holes shall

be suitably blanked off. The cabinet shall be fitted with an external M12 earthing stud, with a nut, lock nut, and a serrated washer.

5.9.8 The control cabinet shall be mounted below the Sectionalizer / LBS and shall be

connected to the Sectionalizer / LBS switchgear by a minimum seven meter long multi-core control cable. The multi-core cable shall be ultra violet stabilized and adequately

screened against electrostatic and electromagnetic interference, which can cause

malfunctioning of the protection or control equipment. This cable shall connect into both the Sectionalizer / LBS and the control cabinet by means of plug and socket

arrangements. Entry of the control cable into the Control Cubicle shall be from the

bottom.

5.10 Software

5.10.1 It shall be possible to download data stored in control unit and configure the Sectionalizer

/ LBS settings using a portable computer locally or remotely. Interfacing should be via USB

port.

5.10.2 Computer software compatible with Windows 7 or later to upload and download

protection settings, to provide history information (event data logs, load profile, etc) to

display breaker contact erosion data etc., shall be supplied. The software shall be

capable of connecting to control system locally or remotely via communication system.

The protocol for data transfer shall be in accordance with 5.12.

5.10.3 The software should have the facility to install on any computer without a separate

license and record the event history to get the information of the access user. The

software should have separate authority levels for ;

Programming, Operating and Monitoring

Operating and Monitoring

Monitoring

5.10.4 The offered software should be backward-compatible with the previous version. A copy

of the manual of the software shall accompany the bid. Required one set of interface

cables shall be provided with every ten units or part thereof.

5.10.5 The downloaded data shall be stored in a suitable fool proof database. This data shall

be able to be extracted as a delimited text format or MS Excel format.

5.10.6 Software shall be valid or provided with necessary keys and upgrades for at least the

full life span of the equipment. The manufacturer/ supplier shall provide necessary

support throughout this period. The software should facilitate remote data downloading

individually from each equipment.

5.11 Auxiliary Supply

5.11.1 Auxiliary supply for the operating mechanism and control cabinet of the Sectionalizer / LBS

shall normally be from an internal sealed battery fitted with a charging system.

Page 31


5.11.2 The battery system shall be capable of initiating correct operation of the Sectionalizer / LBS including controls and operations for not less than 3 days after loss of ac auxiliary supply.

5.11.3 The battery system shall incorporate a battery test facility. The following features shall be

regarded as typical of the 'test' / 'monitoring' facilities required.

(a) Display of battery operating voltage, battery charge / discharge current.

(b) An alarm signal in the event of loss of the battery system or poor battery condition.

5.11.4 The charging system shall operate from a HT Voltage Transformer, incorporated into the

installation. The Voltage Transformer for auxiliary supply shall be designed, manufactured and tested in accordance with IEC 61869-3. It shall be provided with adequate capacity for

provision of auxiliary supply for operating mechanism, control cabinet including RTU and

communication equipment to be incorporated in the control cabinet in future.

It shall be suitable for mounting on the Sectionalizer / LBS pole and supplied complete with

a pole mounting bracket. The auxiliary supply VT shall have a primary winding suitable for

connecting to the 11 KV line and a secondary output voltage of 240V.

5.11.5 A 2A HRC fuse or a circuit breaker shall be provided in the secondary terminal box of the VT

to facilitate the isolation of the secondary wiring in the event of a fault.

5.11.6 A name plate marked with the following information shall be provided on the auxiliary VT:

Manufacturer’s name, serial number, rated impulse withstand level, primary and secondary

voltages, rated current.

5.12 Remote Control / SCADA

5.12.1 Sectionalizer / LBS shall have the facility to monitor and control remotely from Control

Station (future application). Provision for incorporating Remote Terminal Unit (RTU) with

the Controller shall be provided for this future application.

5.12.2 The incorporated Remote Terminal Unit (RTU) shall be compatible with GSM/ GPRS/

3G/4G or latest communication module that allows the Sectionalizer / LBS to

communicate over cellular network with remote server / PC and software supplied as

per clause 5.10. The communication protocol shall conform to DNP3.0, IEC 60870-5-

101& 104 latest versions. Any additional software for RTU / Communications shall be

provided.

5.12.3 Following communication ports shall be provided for SCADA and local configuration.

RS232 (SCADA)

Ethernet RJ45 (SCADA)

USB (Local configuration)

5.12.4 The RTU shall communicate and shall allow for the processing of all analogue and digital

signals including inputs, outputs, measurements and alarms in order to monitor and

control the Sectionalizer / LBS remotely. The power supply for RTU shall be provided

from internal battery.

5.12.5 Voltage detection on both sides of the opened switch shall be possible from the control

centre. The measurement of line parameters (line voltages: on both side of one phase,

phase currents) and maintenance information (such as retrieval of ‘Number of switching

operations performed’) shall be possible from the control center. Periodical, continuous

and on – request remote data acquisition modes shall be available.

Page 32


5.12.6 The RTU shall be firmware upgradable.

5.12.7 The supply of RTU / communication module with the Sectionalizer / LBS is optional. The

BOQ may however include supply of these equipment for limited number of Sectionalizer

/ LBS for testing of remote monitoring and control. In such case the successful bidder is

required provide complete system solution including equipment and software for both

device and server ends to implement remote monitoring and control of the Sectionalizer

/ LBS.

5.13 Rating Plate Markings

The ratings and data of the Sectionalizer / LBS shall be provided in the rating plate

which shall be weather and corrosion proof.

Rating plate shall be provided at the lower part of the base tank and shall consist

following information.

i) Manufacturer's name and trademark

ii) Type designation and serial number

iii) Standard adopted with the year and the edition

iv) Rated voltage, Basic Impulse and Power Frequency Withstand Levels

v) Rated continuous current and short time current with duration vi) Year of manufacture

vii) Purchasers Name : TSECL





with the offer.


The manufacturer of Sectionalizer / LBS shall have minimum of 10 years of experience

in manufacturing similar products. The product offered shall have been in service in




8.0 Spares

8.1 Mandatory Spares

The following mandatory spare parts shall be provided;

01 Nos Control Unit for every 10 Nos. of Sectionalizer / LBS or part thereof.

01 Nos auxiliary supply VT for every 10 Nos. of Sectionalizer / LBS or part thereof.



Page 33


free operation and out maintenance of the Sectionalizer / LBS shall be submitted along

with the bid.

In case special testing equipment and tools are required for testing and maintenance of the Sectionalizer / LBS, such testing equipment and tools shall be supplied along with the

Sectionalizer / LBS.

9.0 Training

The bidder shall provide training on the use of offered Sectionalizer / LBS to nominated TSECL staffs through the Manufacturer. Training shall cover installation, operation and maintenance of the Sectionalizer / LBS and its control system. This should also include setting up parameters for fault detection and operations.

10.0 Warranty

The Bidder shall warrant that all Goods supplied shall have no defect arising from

design, materials or workmanship or from any act or omission of the supplier, that may

develop under normal use of the supplied goods in the conditions as specified. This

Warranty shall remain valid for twelve (12) months after the completion of the final delivery.

In addition, three (3) years comprehensive warranty for electronic devices and cards in the control panel shall be provided.



literature, calculations, operating manuals for equipment and software etc. required for

installation, operation, and maintenance of the equipment. The details shall cover the

main plant and all associated ancillary equipment and software as supplied under the

offer.

12.0 INSPECTION AND TESTING

The Sectionalizer / LBS shall be subjected to routine and type tests in accordance with the

standards listed in this specification. The tests shall include but not limited to the following;

12.1 Type Tests

The following Certificates of type tests as per relevant IEC / IS standards shall be provided.

(a) Dielectric tests

(b) Making and breaking tests

(c) Short time withstand and peak withstand current tests

(d) Measurements of resistance of the main circuit

(e) Temperature raise tests

(f) Dimensional tests

(g) Temperature rise test

(h) Mechanical operation tests

(i) Control electronic elements surge withstand capability and EMI tests

(j) Accelerated weathering test in accordance with IEC 62217 (on bushing

Insulators).

Page 34





cost.






12.2 Routine Tests

The following Routine Tests in accordance with relevant IEC standards shall be carried



(a) Dielectric test on the main circuit

(b) Measurement of the resistance of the main circuit

(c) Tightness test

(d) Tests on auxiliary and control circuits

(e) Design and visual checks

12.3 Inspection

The Successful bidder shall make necessary arrangements for inspection by TSECL


tests on the Sectionalizer / LBS.



the tests as well as conduct design reviews, and periodic inspection of the Sectionalizer /

LBS during manufacture.

12.4 Acceptance Tests The following Acceptance/Sample tests as per IEC 62271-111 or equivalent BIS standard shall be witnessed by the TSECL nominated representative;

(a) Dielectric withstand tests

(b) Measurement of resistance of main circuit

(c) Mechanical operation checks

(d) Leakage check

(e) Temperature rise test

(f) Verification of remote operation with the software

(g) Dimensional tests

(h) The Control unit calibration checks, wiring, operating and functional tests



Page 35


(a) Catalogues describing the equipment - Sectionalizer / LBS, Control Cabinet,

Software and Auxiliary supply VT.

(b) Literature describing the operational feature of the equipment.

(c) Constructional features, materials used for components and relevant technical

literature.

(d) The following drawings;

i) Overall dimensional drawing of the Sectionalizer / LBS including general

arrangement.

ii) Electrical clearance requirements of installation

iii) Insulator assembly and shed profile

iv) Dimensional drawing of mounting arrangement.

v) Name plate to scale, incorporating the particulars called for.


(f) List of Manufacturer Recommended Spare Parts with current prices as per

clause 8.2.

(g) Copies of type test reports as per clause 12.1

(h) Quality Assurance Certification as per clause 6.0.


deviations.


Page 36



12 kV Three Phase Outdoor Sectionalizer / LBS

# Parameter Offered

1. Name and address of the Manufacturer

2. Country of Origin

3. Model No

4. Type

i. Indoor/out door

ii. Insulation media

iii. Interruption media

iv Operating mechanism

v. Number of phases

5. Rated voltage kV

6. Rated continuous current A

7. Rated frequency Hz

8. Rated Short Circuit

Rated duration of short-circuit s

Rated breaking current kA

Rated short-circuit making current (peak) kA

9. X/R ratio

10. Insulation level

Impulse withstand voltage (1.2/50 s) kVpk


kV

Creepage distance, phase-to-earth mm

Clearance, phase-to-phase mm

11. Type of Operating mechanism

i. Closing

ii. Tripping

12 Vacuum Interrupters

i. Make and Model


13. Magnetic Actuators

i. Make and Model


14. Fault Detection and Control

i. Detection of phase and earth faults

ii. minimum actuating-current setting range (phase current)

iii. minimum actuating-current setting range (earth fault current)

iii. Interruption count and Reset

iv. Counts to open setting range

v Inrush-Current Restraint Feature

vi. Response time setting

15 Whether equipment can be used for radial line sectionalizing application.

Page 37


# Parameter Offered

Whether equipment can be used for open ring and ring closing sectionalizing application.

Whether equipment can be used as Load Break Switch

Whether manual locking / unlocking facility by means of a liver mechanism operated using operating rod is available

16 Electrical Endurance

17 Mechanical Endurance

18 Control Cabinet

Enclosure material

Enclosure IP Rating

Provisions for local control and display as specified

Provision for housing RTU / Com. modules

Provision of auxiliary supply via separate VT (IEC 61869-3)

19 Battery Supply

i. Type of Battery

ii. Sealed and maintenance free?

iii. Service life time (Yrs)

iv. No of operations without auxiliary supply

v. Display and low battery voltage signal

vi. Battery hold-up time (hrs)

20 Instrument Transformers (inside bushings)

CT Make and Model

CT Ratio

CT Accuracy

Secondary Amps of the CT

VT Make and Model

Secondary voltage of the VT

21 Material of;

i. Control unit housing / cubicle

ii. Operating mechanism housing

22 Whether the following accessories are provided;

i. Pole steel mounting bracket(s)

ii. Surge arrester mounting brackets on source and load side of Sectionalizer / LBS

iii. Lifting tackle

iv. Earthing terminal

Page 38


# Parameter Offered

v. Applicable earth conductor size

ix. Rating plate provided?

23 Whether the provision for checking the remaining contact life of the interrupter is available

Whether a warning signal will be indicated when the remaining contact life of any phase reaches zero

24 Whether the Software for local / remote monitoring and control of Sectionalizer / LBS is provided

25

Whether a controller with provision to incorporate RTU provided for remote control and communication functions as

specified

26 Whether the manufacturer recommended spare parts list provided

27 Whether the tools are provided (if required) if so the quantity

28 Whether the Type Test Certificates as per Clause 12.1 furnished?

29 Whether the Quality Assurance details and Certification as per clause 6.0 provided?

30 Whether the experience records of the manufacturer as per clause 7,0 provided ?

31 Confirmation that training as per clause 9.0 will be provided

32 Warranty period for Sectionalizer / LBS and associated equipment (Yrs)

33 Warranty period for electronic devices and cards (Yrs)

Signature ---------------------------------------------- Name : Date : Company Seal :

Page 39



12 kV Three Phase Outdoor Sectionalizer / LBS



Signature

----------------------------------------------

Name :

Date :

Company Seal :

Technical Specification for Medium Voltage Overhead Line Fault Passage Indicator

Page 40


Technical Specification for Medium Voltage Overhead Line

Fault Passage Indicator

Rev : R0: 07/2020


Page 41


Contents

1. SCOPE 42

2. SERVICE CONDITIONS 42

3. SYSTEM CONDITIONS 42

4. TECHNICAL REQUIREMENTS 43

5. TESTS AND SAMPLES 45

6. SPARE PARTS AND TOOLS 46

7. TECHNICAL SUPPORT 46

8. TRAINING 46

9. NAME PLATE AND LABELLING 46

10. PACKING 46

11. INFORMATION TO BE SUPPLIED WITH THE OFFER 46

12. WARRANTY 47

13. INSPECTION AND TESTING 47

14. QUALITY ASSURANCE 47

15. HAZARDOUS SUBSTANCES 47


Page 42

Technical Specification for Medium Voltage Overhead Line

Fault Passage Indicator (FPI)

1. SCOPE

This specification covers design, engineering, manufacture, testing, supply, and operation and performance requirements for Medium Voltage Overhead Line Fault Indicator for use in the 33kV and 11kV networks.

The equipment shall conform in all respects to highest standards of engineering, design, workmanship, this specification and the latest revisions of relevant standards at the time of offer and the Purchaser shall have the power to reject any work or material, which, in his judgement, is not in full accordance therewith.

2. SERVICE CONDITIONS

Parameter Value











3. SYSTEM CONDITIONS

The equipment shall be suitable for installation in supply systems of the following characteristics:

Parameter 11kV System 33kV System

Nominal Voltage 11kV 33 kV

Highest System Voltage 12kV 36.3 kV

Number of Phases 3 3

Frequency 50Hz 50Hz


Page 43

Parameter 11kV System 33kV System

Neutral Earthing Solidly earth Solidly earth

3 Phase Short Circuit Levels 13.1 kA 25 kA

Duration of Short Circuit 3 sec 3 sec

Impulse Withstand Voltage 75 kV (peak) 170 kV (peak)

Power Freq. Withstand Voltage 1 min 28 kV 70 kV

4. TECHNICAL REQUIREMENTS

4.1 Types of Fault Indicators

This specification covers technical requirements for supply of following types of fault indicators;

Type 1 : Pole mounted type

Type 2 : Phase (conductor) mounted type

The pole mounted type (type 1) is intended to be used in 3 phase single circuit lines at locations that are clear from interfering magnetic fields from other lines or equipment. It shall be a three phase unit mountable on tubular steel poles or lattice towers below the line conductors.

The phase mounted (type 2) is intended to be used in locations where the use of pole mounted type is not technically feasible due to presence of interfering magnetic fields from other lines or equipment. It shall be single phase unit mountable directly on the phase conductors.

4.2 General Requirements

The medium voltage overhead line Fault Indicator shall be a microprocessor controlled fault current sensing and indication unit suitable for use in three phase overhead power lines of 11 kV and 33 kV for detection of short circuit and earth faults.

It shall be suitable for use in the service and system conditions stipulated in clause 2.0 and 3.0 above.

The FPI shall be rated to withstand upto 36 kV or higher and load current upto 400 A or higher and short circuit levels as specified in section 3.0

The fault sensing shall be based on detection of the variation in the electromagnetic fields in the phase conductors. (di/dt sensor). The trip current

setting of the di/dt unit shall be configurable to rage of step current rise levels by means of a switch bank within the unit.

The configurable trip current setting range (step current rise levels) shall be preferably from 6 A upto 120 A in order to detect both short circuit and earth


Page 44

faults depending on the line loading conditions. The range of configurable trip current settings to match line parameters and load conditions of existing power distribution lines will be specifically verified in selection of suitable FPI unit.

The Indicator shall be designed as with inrush restraint and load variation restraint capabilities so that ; i) It shall not respond to any sudden variation (increase/decrease) in load

current. ii) It shall not respond to high magnetising inrush current.

The indicator shall detect short circuit and earth fault currents travelling through the line and provide indication via flashing light. It shall provide flashing light of different colours for permanent and transient faults. Provision to disable transient fault flashing should be provided for saving battery life.

Indicator shall be capable of detecting fault irrespective of the geometric

arrangement of phase conductors. Guidelines for positioning of fault indicators based on the configuration of lines hall be provided.

Additional features such as self-testing of the unit would be preferable.

4.3 Flash Indication and Resetting

The flash indicator shall be of the Neon/Xenon/ LED type and the flash indication shall be visible for at least 250 m distance during day time.

Duration of flashing shall be pre adjustable at least within a range of 2-6 hrs.

The automatic flash indicator resetting shall be provided. Automatic re-setting shall be facilitated based on the following; i) Resetting after line is re-energised. ii) Restoration after load current is restored. iii) Time activated automatic resetting

In addition, availability of manual resetting through remote control or other means would be preferred.

4.4 Equipment Housing and Mounting

The FPI housing shall be made of UV stabilized and flame retarding type, high strength plastic material. The maximum operating temperature for equipment shall not be less than 75° C.

The FPI shall be outdoor type complying to ingress protection level of IP55 or higher.

The mounting accessories suitable for fixing the indicator on tubular type steel poles (for type 1) or on phase conductors (for type 2) shall be provided. In case of conductor mounting, it shall be suitable for mounting on ACSR conductors of


Page 45

rage of sizes (to be specified). The mounting accessories including brackets, hooks and plates (as required) shall be made of stainless steel or aluminium.

It should be possible to install both types in power lines under live line

(energised) condition. Type 2 shall be mountable on the line using standard hot stick with universal hook. If additional tools are required for installation it should be indicated with the unit prices.

4.5 Power Supply

The power supply for the operation of the electronic components and flash indication of the unit shall be provided through high charge density long life batteries of sufficient capacity suitable for upto 7 years operation.

FPI shall provide ‘low battery’ indication when battery life reachers a threshold level.

4.6 Communication

This specification covers FPI where fault indication shall be provided through flash indication.

The FPIs with in-built communication capability for future application would be preferred. For type 1 FPIs this would be preferably direct communication via SMS / GSM communication to mobile phone / modem / computer server. For type 2 FPIs may be provided with short range RF communication capability to communicate with communication gateway installed nearby for onward transmission through a suitable communication network. Manufacture’s ability to offer equipment and software for future communication application for remote indication of FPI status and other information would be favourably considered.

4.7 Electromagnetic compatibility

The offered FPIs shall conform to the electromagnetic compatibility requirements as specified in IS 14700 including testing requirements.

4.8 Technical Information, Drawings and Manuals

The selected bidder shall supply along with the Indicator relevant drawings, technical literature and manuals including method of installation, operation instructions and maintenance details.

5. TESTS AND SAMPLES

The bidder shall provide demonstration of the functionality of FPIs (including communications) at manufacturer’s facility upon request by TSECL.


Page 46

The bidder shall agree to provide samples as requested by the TSECL for on-site testing prior to confirmation of the order. Onsite testing may include field testing under simulated earth fault condition as instructed by the Project Manager.

In the event the samples provided by the bidder did not provide satisfactory results as per this specification during on-site testing, the bidder will not qualify for further consideration.

6. SPARE PARTS AND TOOLS

Any tools and spare parts provided free of charge with the supply shall be indicated in the offer. A list of recommended spare parts and tools and recommended stock quantities for 10 years trouble free service of the equipment shall be furnished by the bidder together with current prices of each item in the list.

7. TECHNICAL SUPPORT

The bidder shall provide necessary technical advice to TSECL engineers for installation and commissioning of the equipment without any additional cost.

8. TRAINING

The bidder shall arrange training programme on installation, testing, commissioning, operation and maintenance of the equipment at the manufacturer’s facility.

9. NAME PLATE AND LABELLING

Each equipment shall carry a weather and corrosion proof name plate indicating the following particulars.; a) Manufacturer's identification b) Model and serial numbers c) Voltage level applicable and frequency

d) Applicable standards e) Year of manufacture

10. PACKING

Each Indicator shall be suitably packed separately in a bio degradable packing material

to withstand rough handling and carry a label indicating the name of item, model/type No. etc. 11. INFORMATION TO BE SUPPLIED WITH THE OFFER

The following information shall be furnished with the offer;


Page 47

a) Catalogues describing the technical features of the equipment and indicating the Model Number.

b) Completed Schedules of Guaranteed Technical Particulars and Deviations.

c) Test certificates as per applicable standards and performance / factory test certificates confirm the compliance to relevant standards and operational performance of the equipment.

d) A list of clients to whom offered model has been supplied by the bidder previously together with details of supply and contact information.

12. WARRANTY

The selected bidder shall agree to provide warranty against any manufacturing defects for a period of at least one year from the date of supply and acceptance by the TSECL.

13. INSPECTION AND TESTING

The selected Bidder shall agree to make necessary arrangements for inspection by representatives appointed by the TSECL and also to carry out in his presence necessary performance tests / demonstration to confirm the operation of the equipment as per requirements of this specification.

14. QUALITY ASSURANCE

The bidder shall provide documentary evidence of manufacturer’s quality assurance system that is followed during design, production and testing process which shall be acceptable to the TSECL. The availability of valid ISO 9000 quality assurance certification would be favourably considered in this respect.

15. HAZARDOUS SUBSTANCES

The selected bidder shall agree to submit safety data sheets for all hazardous substances used with the equipment. The bidder shall give an assurance that there are no other substances classified as hazardous in the equipment supplied. The bidder shall accept responsibility for the disposal of such hazardous substances, should any be found.

The bidder shall be responsible for any injuries resulting from hazardous substances due to non-compliance with these requirements.


Page 48


To be filled separately for each model offered.

ITEM NO.

DESCRIPTION UNITS BIDDERS

OFFER

1 Name of Manufacturer & Country of origin

2 Model Number

3 Applicable standards

4 Voltage levels and frequency

5 Microprocessor controlled functionality Yes / No

6 Type : (Type 1 : 3-phase / pole mounted Type 2 : Single phase / conductor mounted)

7 For Type 1 only : Mounting distance on pole m

8 For Type 1 only : Suitable for mounting on tubular steel poles

Yes / No

9 For Type 2 : Compatible ACSR conductor sizes

10

Available trip current settings with corresponding load current

Trip Current Setting (A) / Max Load Current (A)

11 Fault detection for under different geometric arrangements

Yes / No

12 Restraint to inrush currents and rapid load variations

Yes/ No

13 Indication of transient faults and ability to disable the same

Yes / No

14

Communications capability

Provide details


Page 49

ITEM NO.


OFFER

Flash Indication

15 Type (neon/xenon/LED)

16 Visibility

During day time m

During night time m

17 Resetting of flash indication

Automatic (voltage restoration)

Automatic (line current restoration)

Automatic time activated / setting range

Manual

Yes/ No

Yes/ No

Hrs

Yes/ No

Equipment Housing and Mounting

18 Dimensions

19 Housing material

20 IP rating

21 Max. operating temperature °C

22 Weather mounting accessories suitable for fixing on tubular steel poles / conductors provided

Yes/ No

23 Additional tools required for mounting? Yes/ No

Power Supply

20 Type of battery

21 Capacity Ah

22 Maintenance free type Yes/ No

23 Service Life Yrs

24 Min operating time of FPI before replacement of batteries

Hrs

25 Low battery level indication ? Yes / No


Page 50

ITEM NO.


OFFER

26 In case of re-chargeable type batteries are provided provide details of on-service charging mechanism (For type 1 only)

Other Information

27 Warranty Period Years

28 Drawings and technical literature included Yes / No

27 Agreement for provision of samples for onsite testing

Yes/ No

28 Agreement for provision of necessary technical support, testing and training

Yes / No

29 List of recommended spare parts and tools included

Yes / No

30 List of references (previous supply) included Yes / No

Signature

----------------------------------------------

Name :

Date :

Company Seal :


Page 51


(To be completed by the bidder)



Signature

----------------------------------------------

Name :

Date :

Company Seal :

Page 52



CABLE FAULT LOCATION AND TEST VAN

Rev 0 07/2020

Page 53

Technical Specifications Cable Fault Location and Test Van

TECHNICAL SPECIFICATION FOR CABLE FAULT LOCATION AND TEST VAN

CONTENTS

1.0

Scope

2.0

System Parameters

3.0

Service Conditions

4.0


5.0


6.0

Quality Assurance

7.0


8.0

Spares

9.0

Training

10.0

Warranty

11.0


12.0


13.0


Page 54


TECHNICAL SPECIFICATION FOR CABLE FAULT LOCATION AND TEST VAN

1.0 SCOPE

This specification covers design, manufacture, assembly, testing at manufacturer's works, supply,

delivery, installation & commissioning of Single Phase Modular Cable Fault Locating Test Van

suitable testing and fault locating low /medium voltage power cables up to 33 KV complete with

all equipment, materials and accessories.


Parameter LT System 11kV System 33kV System

Nominal Voltage 0.415 11kV 33 kV

Highest System Voltage 0.450 12kV 36.3 kV

Number of Phases 3 3 3

Frequency 50 Hz 50Hz 50Hz

Neutral Earthing Solidly Earthed Solidly earth Solidly earth

3 Phase Short Circuit Levels - 12.5 kA 25 kA

Duration of Short Circuit - 3 sec 3 sec

Impulse Withstand Voltage - 75 kV (peak) 170 kV (peak)

Power Freq. Withstand Voltage 1 min

3 kV 28 kV 70 kV


Parameter Value











Page 55



5.1 General

5.1.1. Single Phase Modular Cable Fault Locating Test system shall be suitable for Fault

Identification, Pre-Location, Cable Tracing, Cable Fault conditioning (burn-down), Pin-

pointing, Cable Identification & Testing of HT & LT cables of different types & sizes upto 33

kV. The equipment shall be suitable to carrying out the above-mentioned functions on power

cables of various voltage levels mainly 33KV, 11KV, 415V and control cables with 1.1 KV

grade. The set shall be used for cable types namely XLPE, PVC, PILC with Al / Cu conductor.

The cables are laid underground (under plain earth, trenches, or RCC surface), above ground

or partly under & partly above ground with maximum cable length upto 25 Km.

5.1.2. It is not the intent to specify completely herein all details of the design and construction of

equipment. The bidder must ensure all equipment including all required accessories are

provided together with the test van to carry out specified functions.

5.1.3. The equipment shall conform in all respects to high standards of engineering, design and

workmanship and shall be capable of performing in continuous commercial operation up to

the Bidder's guarantee in a manner acceptable to the Purchaser, who will interpret the

meanings of drawings and specifications and shall have the power to reject any work or

material which in his judgment is not in accordance therewith.

5.1.4. The several runs of cables of different voltage levels are laid on common racks / underground

trench and during the cable fault identification process, nearby cables shall be in charged

condition; hence the accuracy of the system being offered shall not suffer due to the above.

5.1.5. The system should be capable of locating all types of permanent and transient faults viz. core

shorts, core to earth shorts, high impedance faults, core breaks, flash over, sheath faults etc.

5.2 Functionalities

5.2.1 The Test Van shall be designed and equipped to provide the functions / procedures in

accordance with the methodologies and parameters as specified in the table below.

# Function / Procedure Methods

1 Fault Identification Insulation resistance test (0-10 kV)

Breakdown test (DC Test 0-40 kV)

Sheath fault test (0-20kV)

2 Pre-location

TDR Reflectometer and IFL methods

High-voltage pre-location : ARM method (0-32 kV) Decay method (0-40 kV) ICE method (0-32 kV)

Sheath fault prelocation (0-10 kV)

3 Fault Conditioning Performance burning (0-20 KV DC upto 40 A, 0-600 V

AC upto 70A)

Page 56


# Function / Procedure Methods

4 Pinpointing Acoustic Pinpointing (0-32 kV/ 2000 J)

Step Voltage Pinpointing (0-20 kV)

5 Cable Tracing Audio frequency signal detection (0-50 Watt)

6 Cable Identification Current Impulse Detection (0-100A)

7 Cable Testing VLF Testing, 0.1 HZ, Cosinerectangular (CR), 0-36 kV

5.3 Equipment

The Test Van shall be provided with all equipment, instrument and devices for carrying out functions /

procedures indicated above to provide complete, reliable and accurate functionality as specified. This

should include but not limited to Test Instruments, Surge Generators, Signal Generators, Transmitters

and Receivers, Filters, Couplers, Measuring Devices, Protective Equipment, Cables, Probes,

Accessories and Tools. Test Van shall be a self-contained unit where no other external devices or

accessories shall be required to carry out specified functions.

All test instruments shall be offered from the same manufacturer in order to ensure compatibility and

reliability of the functional performance.

The bidder shall submit a list of all key equipment with make & model numbers and brief specifications

supplied with the test van.

5.4 Portable Equipment

The portable equipment such as transmitters and receivers to be supplied with the Test Van shall comply with following technical requirements.

# Function / Procedure Portable Equipment – Technical Requirements

1 Acoustic Pinpointing

Surge Wave Reviver : Acoustic pinpointing reviver shall be supplied with all devices and accessories including display unit (colour), sensor unit, headphones, telescopic handle, measuring tips, carry bag, operating manual etc.

It shall be provided with fault direction indication, background noise reduction, auto-proximity mute features.

2 Step Voltage Pinpointing

Earth Fault Locator : The receiver shall be capable of measuring voltage gradient by earth fault in cable sheath to locate the fault point. It shall be provided with the receiver and color display, 2 nos insulated earth electrodes and connection cables, carry bag and operating manual.

3 Cable Tracing

AF Generator / Receiver Set : The set shall include AF Generator upto 50W, AF Receiver, Connection Cables, Charger, Search Coil, Headphones, Carrying Bags and

Page 57


# Function / Procedure Portable Equipment – Technical Requirements

other accessories. The AF Generator shall be provided with display, frequency selection and auto impedance adjustment. The AF Receiver system shall provide signal direction, direction arrow indications for cable proximity and speaker function for easy cable locations. It shall also be provided with GPS receiver (high accuracy) and facility to save data including GPS coordinates in memory.

6 Cable Identification

CI Generator / Receiver Set : The set shall include CI Generators, CI Receiver, Field sensor, phase identification sensor, test leads,, mains cables, charger, carrying case and operating manuals.

5.5 Control System

The operation and control of fault identification, pre-location, fault conditioning, pinpointing and cable

testing functions shall be provided via centralized control system through an integrated software driven

system.

The personal computer system shall have following minimum configuration: processor - Intel I5 or

higher, 2.5 GHz, 8 GB RAM, SDD 500 GB HDD, Touch Display 21”and additional monitor, A4 size

printer. The operating system Windows or Linux.

The control system software shall be menu driven operated via touch screen or rotary knobs. The

system shall facilitate saving and backing up all data in a relational database system. Software updates

shall be provided free of charge during the period of warranty.

The operator console shall be provided with a table with drawers, computer stands, rotating chair and

storage cabinets and electrical lighting. The control console and instrument sections shall be provided

with air-conditioning.

5.6 Power Supply

The system should work on input supply of 220 V ± 10%. 50 Hz single phase supply. Suitable

control and protection system and should be incorporated in power supply system.

Mains supply shall be provided via following arrangements operating through the alternator /

battery system of the test van;

Generator Set 5 kVA – Van mounted

Electronic Power Generator – Van mounted

5.7 Safety and Protection Equipment

The Test Van shall be installed with safety system including automatic checks interlocking circuit, built

in forced discharge circuit. High voltage can be prepared only after all prerequisites are checked by

the safety circuit so as to ensure that no damage is caused to the equipment. The safety system shall

also include earth monitoring, discharge system monitoring, supply voltage protection including over /

under voltage protection, RCCB.

Page 58


The control unit should provide a visual indication of failure of safety circuits/incorrect selection etc.

with possible corrective methods. Constant monitoring of all safety circuits such as earth monitoring

circuit safety interlock monitoring etc. should be inbuilt into the control unit.

5.8 Cable System

All the cables required for the operation of the system shall be provided with 50 m length mounted on

suitable drums with lockable brakes. This should include high voltage cables, mains cable, ground

cable, RF cable (TDR) and auxiliary cable as per requirement

5.9 Vehicle

All equipment and systems shall be assembled in a van or mini truck conforming to the motor traffic

act of India. It shall be brand new and latest model of a reputed make available in India, serviceable

and maintainable in north-east India.

The test van / vehicle shall comply with following minimum specifications:

Engine : Four cycle, in-line, water cooled, diesel or petrol engine.

Gear system : Manual or automatic synchro-mesh transmission or suitable gear system

compatible to clutch system with four forward and one reverse speed.

Drive : Rear wheel or four wheel

Steering : Power Steering system with steering lock.

Breaks : Power assisted hydraulic system for front and rear wheels and parking break on

transmission.

Electrical system :12 or 24 volts electrical system with heavy duty battery and alternator charging

System.

Assembly : The Cable testing Equipment except portable items shall be permanently fixed to

the system in a convenient and orderly manner. The equipment shall be

accessible from the rear door of the cable testing van.

Spares : Following spares should be supplied ;

a) Spare Wheel

b) Wheel brace.

c) Hydraulic jack.

d) Owner's hand book and operation and periodic maintenance manuals in

English.

e) Set of Spanners, Screw drivers and Pliers

Availability of spare parts should be guaranteed for 05 years

Availability of manufacturer authorized service centers and repair services in Tripura shall be

confirmed. Details of the Authorized agents, repair facilities/workshops available in Tripura shall be

provided.


The manufacturer shall have an established quality assurance system in the process of

design, manufacture and testing of equipment. The bidder shall furnish related quality


with the offer.


Page 59


The manufacturer shall have minimum of 10 years of experience in manufacturing similar

products. The product offered shall have been in service in electricity utilities over past 3

years.



8.0 Tools and Spares

8.1 Tools

The following tools shall be provided;

• Discharging Rods • Measuring Wheel • Earth Spikes • Megger 0-10 KV (5 mA short Circuit Current) • Set of spanners, screw drivers etc.

Any other tool not mentioned above but otherwise required should also be supplied 8.2 Manufacturer Recommended Spare Parts

A list of manufacturer recommended spare parts with current prices for 5 year trouble

free operation and maintenance of the equipment shall be submitted along with the bid.

9.0 Training

The bidder shall provide training on the use of offered Test Van to nominated TSECL staffs through the Manufacturer. Training shall cover operation of all equipment and control system for carrying out specified functionalities and methods for fault location and testing of cables.

10.0 Operation of Equipment

The supplier shall post one trained person per test van at their own cost for operation of the

cable fault locating and testing system for one year in Tripura. During this period the person

should operate the equipment to locate cable faults as appear from time to time. At the same

time he should provide on the job training to the engineers/technicians of the TSECL. The

supplier shall make own arrangements for his boarding, lodging, travel etc.

11.0 Guarantee

The Bidder shall warrant that all Goods supplied shall have no defect arising from design, materials or workmanship or from any act or omission of the supplier that may develop

under normal use of the supplied goods in the conditions as specified. This guarantee shall remain valid for three years after the completion of the final delivery.

In addition, the bidder shall provide three (3) years or 100,000 km comprehensive

warranty for the test van / mini-truck.

12.0 Performance Guarantee

The bidder is also required to provide Performance Guarantee for proper operation and

outcome of the equipment in carrying out specified functionalities and methods for a

period of one year. Bidder is liable for penalties as indicated in the bid document f or any failure against this performance guarantee.

Page 60




literature, calculations, operating manuals for all equipment and software etc. supplied

with the Test Van. The details shall cover the main plant and all associated ancillary

equipment and software as supplied under the offer.

14.0 INSPECTION

TSECL reserves the right to inspect all equipment and Test Vehicle at the manufacturer’s

works prior to shipment. The equipment shall not be shipped without clearance from the

TSECL or its authorized representative.


The following shall be furnished with the offer as applicable.

(a) Catalogues describing the equipment

(b) List of equipment and specifications as per clause 5.3..

(c) Safety instructions.

(d) Shop drawings


(f) List of Manufacturer Recommended Spare Parts with current prices as per clause

8.2.

(g) Quality Assurance Certifications as per clause 6.0.

(h) Guarantees


deviations.


Page 61

Technical Specifications for 12 kV Ring Main Units



12 kV MOTORIZED RING MAIN UNITS (RMU)

Rev : R0: 07/2020

Page 62


TECHNICAL SPECIFICATION FOR 12 kV MOTORIZED RING MAIN UNITS

CONTENTS 1.0 SCOPE ................................................................................................................................ 63

2.0 SYSTEM PARAMETERS.................................................................................................... 63

3.0 SERVICE CONDITIONS ..................................................................................................... 63

4.0 APPLICABLE STANDARDS ............................................................................................... 64

5.0 TECHNICAL REQUIREMENTS .......................................................................................... 65

5.1 GENERAL .............................................................................................................................. 65

5.2 FUNCTIONAL UNITS AND NOTATIONS ...................................................................................... 65

5.3 RMU TECHNICAL PARAMETERS ............................................................................................. 66

5.4 RMU DESIGN AND CONSTRUCTION ........................................................................................ 67

6.0 INSPECTION AND TESTING...................................................................................................... 74

7.0 QUALITY ASSURANCE ............................................................................................................ 76

8.0 MANUFACTURING EXPERIENCE .............................................................................................. 76

9.0 SPARES ................................................................................................................................ 76

10.0 TRAINING .............................................................................................................................. 76

11.0 WARRANTY ........................................................................................................................... 77

12.0 TECHNICAL LITERATURE AND DRAWINGS ................................................................................ 77

13.0 INFORMATION TO BE FURNISHED BY THE BIDDER ..................................................... 77

SCHEDULE OF DEVIATIONS.......................................................................................................... 78

Page 63


TECHNICAL SPECIFICATION FOR 12 KV MOTORIZED RING MAIN UNITS

1.0 SCOPE

This specification covers the design, manufacture, testing, supply, and delivery and performance requirements of Ring Main Units (RMU) for use in 11 kV underground distribution networks in Tripura for indoor and outdoor applications. RMUs will be installed and operated under the system and service conditions indicated below. RMUs shall be offered in accordance with the requirements of this specification and latest versions of the standards listed herein. 2.0 SYSTEM PARAMETERS




Number of Phases 3

Frequency 50Hz







Parameter Value











Page 64





IEC/ISO IS Subject

IEC 62271-1:2017 IS/ IEC 62271-1 High-voltage switchgear and controlgear - Part 1: Common specifications for alternating current switchgear and controlgear

IEC 62271-200:2011 / COR1:2015

IS/ IEC 62271-1 High-voltage switchgear and controlgear - Part 200: AC metal-enclosed switchgear and controlgear for rated voltages above 1 kV and up to and including 52 kV

IEC 62271-201:2014 IS / IEC 62271-201

High-voltage switchgear and controlgear - Part 201: AC solid-insulation enclosed switchgear and controlgear for rated voltages above 1 kV and up to and including 52 kV

IEC 62271-102:2018 IS / IEC 62271-102

High-voltage switchgear and controlgear - Part 102: Alternating current disconnectors and earthing switches

IEC 62271-100: 2008+AMD1:2012+AMD2:2017

IS/ IEC 62271-100

High-voltage switchgear and controlgear - Part 100: Alternating-current circuit-breaker

IEC 62271-103:2011 / COR1:2013

High-voltage switchgear and controlgear - Part 103: Switches for rated voltages above 1 kV up to and including 52 kV

IEC 62271-205 : 208 High-voltage switchgear and controlgear – Part 205: Compact switchgear assemblies for rated voltages above 52 kV

IEC 62271-214:2019

High-voltage switchgear and controlgear - Part 214: Internal arc classification for metal-enclosed pole-mounted switchgear and controlgear for rated voltages above 1 kV and up to and including 52 kV

IEC 60376:2018 BIS IS 13072 Specification of technical grade sulphur hexafluoride (SF6) and complementary gases to be used in its mixtures for use in electrical equipment

IEC 60060:2020 IS / IEC 60060 High-voltage test techniques

IEC 60529: 1989 +AMD1:1999+AMD2: 2013

IS 13947 Degrees of protection provided by enclosures

IEC: 61869 IS 2705 : 1992 Instrument transformers.

IEC: 61869 IS: 3156 Instrument transformers

IEC 62055 Electrical Relays

Page 65



5.1 General

This specification covers the design, manufacture, testing, supply, and delivery and performance

requirements of Ring Main Units (RMU) for use in 11 kV underground distribution networks in Tripura

for indoor and outdoor applications.

5.2 Functional Units and Notations

The following notations will be used in this specification for the purpose of referencing. Same may be

used in BOQs / Price Schedules as per the notations specified herein in the bid documents.

It is noted that different notations or symbols are used by the different RMU manufacturers. The

notation system used in the specification is for reference purpose only and does not imply or favor

any specific makes or models.

Notations for RMU Functional Units (Modules)

Notation Description of functionality

S Ring Main Feeder with Switch disconnnector and earthing switch

B Tee off / Transformer Feeder with Circuit Breaker, disconnector and earthing

switch

Notations for Extensibility of RMUs

Notation Description of functionality

Non extensible (Standard unless otherwise specified)

RE Extensible to right

LE Extensible to left

DE Double Extensible to left or right

Notations for Installation Types

Notation Description of Installation Type

Outdoor, inside Kiosk (Standard unless specified as N)

N Indoor

Page 66


5.2.1 Functional Configurations

The RMUs shall have functional configurations of comprising of any combination of the basic

functional units defined above.

Ex: 3 Way RMUs - SBS

4 Way RMUs - SBBS, SSBS

5 Way RMUs - SSBBS, SBBBS,

6 Way RMUs - SBBBSS

5.2.2 Notation

The following notation sequence will be used to define required type of RMU in this specification as

well as in the BOQ / Price Schedules.

Functional Configuration : (VCB Rating) - (Indoor/ Outdoor) – (Extensibility)

The parameters indicated within brackets are optional. Following rules shall apply for using above

notation:

RMU Functional unit B (circuit breaker) rating shall be 200A (standard) if unspecified.

RMU shall be Outdoor (standard) if unspecified.

RMU shall be non-extensible type if unspecified.

Ex : SBS : 3 Way RMU with SBS functional configuration, outdoor, non-extensible

SBS: 630 : Ditto but 630A VCB

SBS - N - RE : 3 Way RMU with SBS functional configuration, Indoor, Right Extensible

SBBS - DE : 4 Way RMU with SBBS functional configuration, outdoor, Double Extensible

5.3 RMU Technical Parameters

The RMU shall comply with rated parameters for RMU and switchgear as specified in Table 1 and be

able to operate with minimum maintenance and under the system parameters and service conditions

given in clause 2.0 and 3.0.

Table 1 : RMU Rated Parameters

RMU Rated Parameters

(I) RMU unit and switchgear

Rated voltage kV 12

System Voltage kV 11

Frequency Hz 50

No. of Phases - Three Phase (3 wire system)

Insulation Medium - Solid dielectric (HCEP) / SF6 Gas


kVpk 75

Page 67


RMU Rated Parameters


kV 28

Rated normal continuous current A 630

Rated short time withstand current kA 20

Rated duration of short Circuit s 3

Internal Arc Classification : IAC A FLR kA/s 20/1

(II) Switch Disconnector (For Functional Unit S)

Rated Current A 630

Rated load breaking capacity A 630

Rated breaking capacity – cable/line charging A 110

Rated earth fault breaking current A 200

Rated short circuit making current kApk 50

Electrical and mechanical endurance class - E3 / M1

(III) Vacuum Circuit Breaker (For Functional Unit B)

Rated Current A 200 (standard) / 630

Rated short circuit breaking current kA 25

Rated short circuit making current kApk 62.5

Operating sequence - O - 3min - CO - 3min - CO

Electrical and mechanical endurance class for specified operating sequence

- E2 / M1

(IV) Earthing Switch (ES) / Disconnector

Rated Making Current kApk 50

Electrical and mechanical endurance class (ES) - E2 / M0

Disconnector - mechanical endurance class - M0

5.4 RMU Design and Construction 5.4.1 General Requirements

The RMU to be supplied against this specification are required for vital installations where

continuity of service is very important. The design, materials and manufacture of the

equipment shall, therefore, be of the highest order to ensure continuous and trouble free

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service.

The RMU offered shall be compact, maintenance free, easy to install reliable, safe and easy

to operate and complete with all parts necessary for their effective and trouble-free operation.

Such parts will be deemed to be within the scope of the supply irrespective of whether they

are specifically indicated in the commercial order or not.

The RMU shall be suitable for mounting on plinth and mounted on structure with provision

for cabling through gland plate in the base and trench below. The RMU shall be designed to

be tamper proof so as to prevent access to all live parts during operation without the use of

tools.

The RMU shall be designed so that the position of the different devices is visible to the

operator on the front and operations are also visible.

5.4.2 RMU Tank and Insulation

The tank containing shall be corrosion resistant stainless steel sheet (Grade SS 304 – Non

ferrite, Non Magnetic) of minimum 2.5 mm thickness (as per relevant IS/ IEC). It shall comply

with Internal Arc Classification as specified in Table 1.

The solid dielectric or SF6 gas shall be used as insulation media in accordance with IEC

62271-201/ 62271-200. Accordingly all high voltage live parts except for the cable

connections shall be suitably insulated with solid epoxy (HCEP) or SF6 gas.

In case of SF6 gas insulation; the tank shall meet the 'sealed pressure system' criteria in

accordance with the IEC 62271-200. Accordingly no handling / refilling of gas shall be

required throughout the expected operating life, i.e. 30 years. Sealed pressure systems are

completely assembled, filled and tested in the factory. The maximum leakage rate of SF6

gas shall be lower than 0.1% of the total initial mass of SF6 gas per annum. The filling

pressure for the switchgear shall be just above the atmospheric pressure so as to reduce the

tendency to leak. SF6 gas used for the filling of the RMU shall be in accordance with IEC

60376:2018. It is preferable to fit an absorption material in the tank to absorb the moisture

from the SF6 gas and to regenerate the SF6 gas following arc interruption. There shall be

no requirement to 'top up' the SF6 gas.

The degree of protection for RMU tank shall be IP 67. The Front cover mechanism and cable

cover shall have IP2X degree of protection.

5.4.3 Busbars

The phase and earth busbars made up of copper with ratings as given in Table 1 and

according to relevant IS/IEC standards. The phase bus bars and live parts shall be fully

encapsulated by solid insulation or SF6 gas inside the steel tank. Earthing circuit shall be

provided with visible earthing contacts to enhance operator safety. Provision shall be made

on end of RMU for connecting the earth bus to the earth grid by erecting suitable 2 earth

pipes / earth rods.

5.4.4 Functional Unit S

The functional unit S (Ring Main Feeder Unit) shall be equipped with fault making / load

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breaking spring assisted ring Switch Disconnector and integral earth switch complying with

ratings provided in Table 1.

In case of solid insulated RMU, unit shall be provided with vacuum type load break switch,

disconnector and earth switch with ratings as indicated in Table 1.

The Switch Disconnector and earth switch shall comply with the requirements specified in

IEC 62271-102 and 103.

The switch disconnector shall be provided with motorized operating mechanism and

compatible for remote operation in future with SCADA integration. Mechanism for manual

operation shall also be provided.

LBS operation counter and local remote control selection switch shall be provided. It shall be

provided with 2NO + 2 NC auxiliary contacts.

Earthing switch shall have manual operating mechanism and provided with 1NO+1NC

auxiliary contacts.

Interlocking shall be provided as indicated in section 5.4.11.

5.4.5 Functional Unit B

The functional unit B (Tee off / Transformer Feeder Unit) shall be equipped with Vacuum

Circuit Breaker (VCB), Disconnector and Earth Switch complying with ratings provided in

Table 1.

The VCB, Disconnector and Earth Switch shall comply with the requirements specified in

IEC 62271-100 and 102 and 103.

The VCB shall be provided with motorized operating and spring charged mechanism and

compatible for remote operation in future with SCADA integration. Local remote control

selection switch shall be provided. It shall be fitted with a local system for manual tripping by

an integrated push button. VCB shall be provided with 4NO+4NC Auxiliary contacts and

operations counter.

The circuit breaker shall be associated with an integrated protection unit that will operate

without any auxiliary power supply and shall include three toroid current transformers

incorporated in the cable chamber as per manufacturer standard type test design. The CT

settings shall be adjustable according to site requirements . Protection core CT complete

details should be furnished (Burden, class, ALF).

An electronic relay self-powered through CTs, a low energy release, and a "fast-on” test

receptacle for protection testing (with or without CB tripping) shall be provided. The protection

system shall ensure circuit breaker tripping as of a minimum operating current which is the

rated current of the feeder to be protected.

Earthing switch / Disconnector shall have manual operating mechanism and provided with

1NO+1NC auxiliary contacts. Disconnector shall be provided with 2NO+2NC Auxiliary

contacts.

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Interlocking shall be provided as indicated in section 5.4.11

5.4.6 Protection Relays (for functional unit B)

The relay shall be provided with Phase protection of Definite time/ IDMT element for

overcurrent and earth fault with minimum PSM-0.05,Tsm-0.01 having standard

characteristics of Standard Inverse, Very inverse, Extremely Inverse as per IEC 60255-3

standard. The Earth Fault Protection shall be provided of Definite time/ IDMT element having

standard characteristics of Standard Inverse, Very inverse, Extremely Inverse as per IEC

60255-3 standard. The "Time Multiplier" with minimum set point of 0.05 TMS shall be

available. The breaker shall have the provision of LED indication of Trip on Fault High set

(DT) for overcurrent and earth fault-min current setting-0.5 In, minimum Time Delay- 20

milliseconds. The relays shall be suitable numerical relay with necessary elements.

On this basis, the relay as a minimum shall provide:

a) Phase Over Current Protection: (50/51)

b) Earth Fault Protection: (50N/51N)

The relay shall also be provided with:

- Alphanumeric Liquid Crystal Display (LCD)

- Parameter change capability that is password protected

- Capability to record up to 5 of the latest fault records duly time stamped and stored in

- non-volatile memory for subsequent reading via the above referred RS485/RS 232 port

5.4.7 Instrument Transformers and Voltage Sensors

3 nos ring type, single core CTs and 3 phase-earth VTs with fuse protection shall be provided

in each circuit breaker for protection and metering purpose. The CTs and VTs shall conform

to relevant IS / IEC standards. The design and construction shall be sufficiently robust to

withstand thermal and dynamic stresses during short circuits. Secondary terminals of CTs &

VTs shall be brought out suitably to a terminal block in the RMU LV compartment, which will

be easily accessible for testing and connections.

Appropriate capacity and ratings of CTs and PTs shall be provided in the RMU for protection

and metering (future) purpose. Further protection relays shall be self-powered through the

current transformers (CTs) without requiring an auxiliary power supply to operate. The

metering shall not be in the scope of supplier but the provision and space for installation of

the separate metering enclosure in future shall be available.

The RMU's other CTs/sensors, for other equipment including Fault Passage Indicators

(FPIs), shall be supplied by the FPI manufacturer. These CTs/sensors shall be an integral

part of the FPI’s design to ensure that they properly match the requirements of the FPI.

A voltage sensor shall be provided for all the functional units. It shall provide a signal with an

accuracy of 5% for voltage presence (VPIS) indication. The voltage shall be detected on the

cable side.

5.4.8 Cable Compartment, Bushings and Cable Terminations:

Each cable compartment shall have front access and shall have IP2X degree of protection.

Each compartment shall be provided with three bushings of adequate sizes to terminate the

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incoming and outgoing cables. Bushings shall be Type C rated for 630 A: 25 kA 1 s, 20 kA 3

s and 62.5 kA peak.

Insulated field disconnectable connectors of Interface type C (recommended by the

manufacturer) shall also be provided for each bushing with required conductor and bi-

metallic connectors to connect single / three core XLPE / Al cable upto cross section of 300

sqmm . This should be the part of supply of accessories under this specification.

5.4.9 Cable Test Facility (CTF):

Separate cable test facilities that are independent of the cable termination enclosure shall

be provided.

It shall be possible to connect cable test equipment (e.g. pressure testing or fault locating

equipment) to the cable via separate cable test facility. If additional injection fingers are

required to connect test instruments to the CTF terminals it should be provided for each

RMU.

Connecting and disconnecting of the cable test leads shall be performed under safe earthed

conditions only. Access to the test terminals of the cable test facility shall only be possible

when the associated earth switch is in the closed EARTH position.

After connecting the test equipment, which must only be possible under safe earthed

conditions, the integrated earth connection shall be removed for testing purposes without

interfering with the connected test equipment. After completing the test procedure the

integrated earth connection must be reconnected without interfering with the test equipment.

The test equipment must be safely removed under full earthed conditions. Under normal

service conditions (live cable and busbar) the test connections must be fully earthed.

Each cable test facility shall be interlocked with its associated earth switch and be capable

of being padlocked to ensure that the test terminals of the cable test facility are not accessible

when the cable is energized. The test terminals must be fully earthed under normal service

conditions, access must only be possible when the panel is switched ON in earthed position.

5.4.10 Indication and Controls

All required indications including the following shall be provided in the front panel;

Open / close the status of the RMU circuit breakers and load break switches.

The health of the power supply, which will include battery failure and low voltage

indications.

Open / closed status of RMU earthing switches.

For SF6 insulated type, low SF6 gas pressure indication.

For circuit breaker relay operations.

Indication of main-circuit fault detected by the RMU's FPI

Voltage presence indication for each functional unit

Local controls for operation of switchgear

Manual operating mechanism for switchgear.

Clearly visible mimic diagram that indicates the different functions and position.

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5.4.11 Interlocks

Suitable fool-proof mechanical, electrical and key interlock system shall be provided to

ensure safety of equipment and personnel when operating the RMU locally and remotely.

This should include but not limited to suitable electrical and mechanical interlocks to facilitate

following;

Operation of earth switch (ES) is only possible when incoming voltage is not present in

cable and LBS / VCB in the functional unit is open.

Operation of LBS is only possible when ES is open and cable compartment cover is

closed.

Operation of diconnector is only possible with VCB / LBS is open.

Opening cable compartment door is only possible when ES is closed.

Test terminals of the cable test facility are accessible (for connection / disconnection of

test leads before / after testing) only when ES is closed

Provision shall be made available for key-locking or padlocking to prevent unauthorized

access for LBS / CB / ES controls, cable test facility terminals and cable compartment.

5.4.12 Outdoor Enclosure

The RMUs for outdoor installation shall be provided with outdoor enclosure with ingress

protection degree of IP54. They shall also be suitable for conditions in which they will be

exposed to heavy industrial pollution, and high levels of airborne dust. Access to RMU

controls and cable compartments shall be provided via door panels.

The outer enclosure shall be made of CRCA, 2 mm thick with thick glands plates of 3 mm.

The sheet steel and the fabricated parts shall be pretreated using 7 tank process and then

coated by layer of zinc phosphate. A finish coat with high scratch resistance epoxy powder

finish paint shall be applied over the primer. The coat thickness shall be minimum 100

microns +/- 25 micron.

The equipment in the proposed outdoor RMU shall be coated to meet specified climatic

conditions. In this respect, standards such as IEC 60870-2-2 covering equipment, systems,

operating conditions, and environmental conditions shall apply along with IEC60721, which

covers the classification of such conditions.

The enclosure unit shall be powder coating of RAL 7032 Grey to DIN Standard43656.

5.4.13 SCADA Compatibility

The RMU shall be provided with standard interfacing facilities for retrofitting RTUs and

communications gateways for integration with SCADA / DMS systems for remote control,

monitoring and automation. It shall be fully SCADA compatible and provide remote access

and control all functional units with motorized control when in remote control mode.

The communication interfaces shall support standard IEC 101/104, DNP3, IEC 61850 and

Modbus protocols.

It shall also be provided with facility for connection with AMI metering units.

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5.4.14 Fault Passage Indicator

Fault Passage Indicators (FPI) shall be installed with Functional Unit S (Ring Feeder). In

case of 3 way RMU, FPI shall be provided with one ring feeder unit and in case of 4-6 way

RMUs it shall be provided with at least 2 ring feeder units.

The FPI shall have following functionalities and indication shall be available locally as we as

remotely (when connected with SCADA/ DMS in future);

Indication of phase-phase and phase-earth faults

Display of parameters & adjustable settings for short circuit (200 – 1000A) and earth

fault ( 10 – 150 A)

Settings for time delay for inrush currents

Display of the faulty phase

Display of load current, maximum current for each phase, frequency and direction of

energy flow

Fault passage indication for remote monitoring (SCADA compatible)

The FPI shall be provided with following resetting options;;

Manual reset

Resetting after a set time duration

Resetting on restoration of supply

Provision for remote resetting via communication (future)

The FPI shall be self-powered by suitable means and provided with separate CTs for fault

detection.

5.4.15 Power Supply and Battery

The RMU shall be provided as a self-powered unit, with CPT (Control Power Transformer)

directly connected to the live bus feeding the AC/DC converter and battery charger system

with 230 VAC.

The batteries shall be 24 VDC and capable of providing sufficient power to buffer the load

for more than 48 hours with up to 120 single operations.

The AC/DC converter and battery system shall have sufficient capacity to feed all equipment

in the LV circuit by 24 VDC including the aux relays, switchgear operating mechanisms,

motor coils and communication equipment.

5.4.16 Software

All software required for RMU equipment and communication devices shall be provided.

5.4.17 Accessories and Tools

All accessories and tools required for installation and operation shall be provided with each

RMU. This should include but not limited to the following;

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Set of interface type C insulated cable connectors for each functional unit

Operating handles

Padlocks and keys

Earthing cables and connectors

CTF injection fingers to connect with cable test equipment leads (if required)

5.4.18 Name Plate & Marking

All the components and operating devices of the RMU shall be provided with durable and

legible nameplates containing all technical parameters. Name plates shall be suitably

embossed with the following information.

Name / address of the manufacturer

Month and year of supply

PO Number

Rated Voltage

System Frequency

RMU Configuration (functional units)

Applicable Rated values

Rated short time withstand current for 3 sec

Rated Impulse and power frequency withstand Voltage

Degree of Protection

Type Designation or Serial no.

Year of manufacture

Mass of unit SF6 gas filling pressure (for SF6 insulated units)

Property of TSECL

A Danger plate / label of appropriate size shall also be provided on the enclosure.

6.0 Inspection and Testing

The RMU shall be subjected to type tests, routine and acceptance tests in accordance with

the standards listed in this specification. The tests shall include but not limited to the following;

6.1 Type Tests




cost.






The following type tests certificates as per relevant IEC / IS standards shall be provided.

Short time current withstand test and peak current withstand test.

Lightening Impulse voltage with-stand test

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Temperature rise test.

Short Circuit current making and breaking tests.

Power frequency voltage withstand test (dry).

Capacitive current switching test confirming to IEC.

Mechanical operation test.

Measurement of the resistance of the main circuit.

Checking of degree of protection of main tank and outer enclosure

Switch, circuit breaker, earthing switch making capacity.

Switch, circuit breaker breaking capacity.

Internal arc withstands.

Checking of partial discharge on complete unit.

6.2 Routine Tests

The following Routine Tests in accordance with relevant IEC / IS standards shall be carried



Conformity with drawings and diagrams,

Measurement of closing and opening speeds,

Measurement of operating torque

Dielectric testing and main circuit resistance measurement.

Power frequency voltage

Resistance test for the circuit

Mechanical operation tests.

Micro ohm test (contact Resistance test) for the assembly inside the tank

Circuit breaker analyzer test so as to ensure the simultaneous closing of all Poles for

VCB.

Partial Discharge test on the complete tank so as to be assure of the proper insulation

level and high service life.

High voltage withstand.

Secondary tests to ensure the proper functioning of the live line indicators, fault passage

indicators and relays.

For SF6 insulated RMU following tests are also applicable;

Checking of filling pressure,

Checking of gas-tightness,

SF6 gas leak test

6.3 Acceptance Tests

All or selected the tests listed under Routine Tests above shall be carried out as acceptance

test on random samples as per sampling plan under IEC/15 for each lot.

Heat Run Test shall be carried out on one random sample / configuration quantity as

acceptance test.

6.4 Inspection

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The successful bidder shall make necessary arrangements for inspection by TSECL


tests on the RMU.



the tests as well as conduct design reviews, and periodic inspection of the RMU during

manufacture.





with the offer.


The manufacturer of RMU shall have minimum of 10 years of experience in

manufacturing similar products. The product offered shall have been in service in




9.0 Spares

9.1 Mandatory Spares and Tools

The following mandatory spare parts shall be provided for every 20 Nos of RMUs or

part thereof.

03 Sets of interface type C insulated cable connectors (3 Nos per set)

01 Nos battery charges

01 Nos motor and gear units

01 Set of operating handles

Bidder shall note that this is in addition to the accessories and tools to be supplied with

each RMU as indicated in clause 5.4.17.



free operation and out maintenance of the RMU shall be submitted along with the bid.

In case special testing equipment and tools are required for testing and maintenance of the RMU, such testing equipment and tools shall be supplied along with the RMUs.

10.0 Training

The bidder shall provide training on offered RMUs to nominated TSECL staffs through the

Manufacturer. Training shall cover installation, operation and maintenance of the RMU and

its switchgear.

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11.0 Warranty

The Bidder shall warrant that all Goods supplied shall have no defect arising from design, materials or workmanship or from any act or omission of the supplier, that may

develop under normal use of the supplied goods in the conditions as specified. This

Warranty shall remain valid for thirty six (36) months after the completion of the final delivery.

In addition, three (3) years comprehensive warranty for electronic devices and cards in

the control panel shall be provided.



literature, calculations, operating manuals for equipment etc. required for installation,

operation, and maintenance of the equipment. The details shall cover the main plant and

all associated ancillary equipment and software as supplied under the offer.



(a) Schematic diagram of the RMU and design details

(b) Catalogues describing the equipment – RMU and its equipment

(c) Literature describing the operational features of the equipment.

(d) Constructional features, materials used for components and relevant technical

literature.

(e) Overall dimensional drawing of the RMUs offered

(f) Manufacturing experience in accordance with clause 8.0

(g) List of Manufacturer Recommended Spare Parts with current prices as per

clause 9.2.

(h) Copies of type test reports as per clause 6.1

(i) Quality Assurance Certifications as per clause 7.0.

(j) Completed schedule of guaranteed technical particulars and schedule of

deviations.


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12 kV Three Phase Outdoor Auto RMU



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Date :

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