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8/11/2019 AMA00E TP001 RA Site Commissioning Procedure for Electrical Systems
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Replaces Customer Code ALSTOM Document Code
AMA/00/E/----------/TP/001Responsible dept.
TYCC-INCreated by
Samy A-L.Checked by
Gupta S. Approved by
Varshney S.Format
A4Originator
POW R
GAS BUSINESS
Document Type
Test ProcedureDocument Status
Electronically releasedTitle, Subtitle
Site Commissioning Proceduresfor Electrical Systems
Identification number
1AHA609989Rev.
ADate
10.12.2012Lang.
enSheet
1/3
Template No.: Att.1 to >XYZ/00/-/01-----001/PPI/001 A< (released with corresponding Project Procedure >XYZ/00/-/01-----001PPI/001<)
© ALSTOM 2012. All rights reserved. Please consider the environment before printing this document.
Site Commissioning Procedures for ElectricalSystems
Owner
Project
AL–MANSURYA GAS TURBINE POWER PLANT (PHASE I)
Space for Stamping (Review and Validation status)
Cross checked
Department Name Date Signature
Revision History
Rev. Revision Date Created by Checked by Approved by Brief Description
Description Current Revision
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Electronically released
Originator
LSTOM
POW R
Identification number
1AHA609989Rev.
ADate
10.12.2012Lang.
enSheet
2/3
© ALSTOM 2012. All rights reserved.
Table of Contents:
1 OBJECTIVE .......................................................................................................................... 3
2 LIST OF SITE COMMISSIONING PROCEDURES .............................................................. 3
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Electronically released
Originator
LSTOM
POW R
Identification number
1AHA609989Rev.
ADate
10.12.2012Lang.
enSheet
3/3
© ALSTOM 2012. All rights reserved.
1. OBJECTIVE
The purpose of this document is to list all the site commissioning procedures used forelectrical systems at Al-Mansurya Site.
2. LIST OF SITE COMMISSIONING PROCEDURES
Document Number ID Number DESIGNATION
GAS/00/E/153B---002/TP/101 1AHA608688Site Commissioning Procedure For PowerTransformer Field Testing
GAS/00/E/153B---002/TP/102 1AHA608717Site Commissioning Procedure For CT & PT FieldTesting
GGG/00/E/TEC-------/TP/404 PSP29 A43047 Neutral Earthing Resistor Field Testing
GGG/00/E/TEC-------/TP/405 PSP29 A43042 HV Surge Arrester Field Testing
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Main Contractor
Alstom Switzerland) Ltd. , Brown Boveri Strasse 7, CH 5401-Baden Replaces Customer Code ALSTOM Document Code
GAS/00/E/153B---002/TP/101Responsible dept.
GSEEECreated by
Schuele N.Checked by
Hug R. Approved by
Huser J.Format
A4Originator Document Type
Test ProcedureDocument Status
Electronically released
Title, Subtitle
Site Commissioning Procedure
Identification number1AHA608688
Rev. Date Lang. Sheet
SITE COMMISSIONING PROCEDURE
FOR POWER TRANSFORMER FIELD TESTING
Projects and Customer’s Information:
Plant Name, Project:
Customer:
Acceptance Authority:
Customer Order No.: ALSTOM Order No.:
Notification Periods: Measuring System:
QA coordination:
Space for Stamping (Review and Validation status)
Cross checked
Department Name Date Signature
Revision History
Rev. Revision Date Created by Checked by Approved by Brief Description
ADescription current Revision:
First Issue
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Site Commissioning Procedure
For Power Transformer Field Testing
Identification number
1AHA608688
DRAFT
TABLE OF CONTENT
1 INTRODUCTION 3
1.1 PURPOSE 3
1.2 AREA OF APPLICATION 3
1.3 REFERENCE DOCUMENTS 3
1.4 ABBREVIATIONS 3
2 SAFETY SYMBOLS 4
3 List of commissioning TOOLS 5
4 HEALTH AND SAFETY 5
4.1
SPECIAL SAFETY PRECAUTION 5
5 POST-INSTALLATION CHECKS 6
5.1 DATA RECORDING 6
5.2 VISUAL INSPECTION 6
6 PRE-commissioning 7
6.1 EARTH RESISTANCE CHECKS 7
6.2 TRANSFORMER ACTIVE PART CHECKS 7
6.3 AUXILIARY CIRCUIT CHECKS 10
6.4 CURRENT TRANSFORMERS 12
6.5
TAP-CHANGERS 12
6.6 POWER CABLES AND CONNECTIONS 13
7 COMMISSIONING 13
7.1 BEFORE THE ENERGISATION 13
7.2 FIRST ENERGISATION – NO LOAD CHECKS 14
7.3 HOT COMMISSIONING (ON LOAD CHECKS) 14
7.4 RECORDS 14
8 ANNEX 15
8.1 TRANSFORMER CONNECTIONS 15
LIST OF FIGURES
FIGURE 1: TRANSFORMER VECTOR GROUP DETERMINATION TEST RESULT PLOT. 9
FIGURE 2: SIMPLIFIED BUCHHOLZ RELAY ON TRANSFORMER. 10
FIGURE 3: SIMPLIFIED PRESSURE RELIEFE VALVE. 11
FIGURE 4: OFF CIRCUIT TAP-CHANGER (OCTC) SAFETY PADLOCK. 12
FIGURE 5: THREE-PHASE TRANSFORMER CONNECTIONS 15
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Site Commissioning Procedure
For Power Transformer Field Testing
Identification number
1AHA608688
DRAFT
3 LIST OF COMMISSIONING TOOLS
The following is a list of the main test equipment necessary in order to carry out all the testing of the
equipment covered by this procedure:
Warning / Caution Notices
Anti-personal barriers
Thermometer
Hygrometer
Insulation Resistance Tester (Megger) up to 5 kV
Digital Multimeter
400 VAC three-Phase Supply with MCB
Phase Rotation Tester
Chronometer
Test leads
CT tester (optional / if available)
Note: Tools, which need to be calibrated, must have a valid calibration certificate traceable to
internationally accepted standards.
4 HEALTH AND SAFETY
The work outlined in this procedure must only be carried out by persons who are competent and
appropriately qualified engineers in the appropriate disciplines. These persons shall:
Be aware of all Site Safety Procedures & Statutory Regulations and fully comply with them.
Recognize the hazards, which can arise when working on energized apparatus and take all
necessary precautions.
Recognize the hazards of induced current and take all necessary precautions.
Ensure that two people are always present when working with live equipment.
Use approved tools and equipment.
Wear always your personal protective equipment. Read the manufacturer's O & M manuals and get familiar with the safety regulations.
4.1 SPECIAL SAFETY PRECAUTION
When work is performed on a transformer connected to the system, proper earthing tools must be
installed on HV & LV sides.
Before any voltage or current injection, check that all Current Transformer secondary circuits are
closed.
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Site Commissioning Procedure
For Power Transformer Field Testing
Identification number
1AHA608688
DRAFT
5 POST-INSTALLATION CHECKS
The following section describes all activities and tests to be carried out on transformers prior to start
any pre-commissioning activities.
5.1 DATA RECORDING
Test sequence:
The data of the transformers shall be taken directly from its nameplate (if applicable) and check against
the technical specifications.
5.2 VISUAL INSPECTION
The transformer shall be first inspected visually. Special attention shall be paid to any damage that
could have occurred during transport or installation. Check that the transformer, the control cabinet and
all accessories are cleaned and touch up painted if needed.
5.2.1 Valves positions
Test sequence:
Check that all valves are in the position indicated either at the general arrangement plan or at the
indicator panel meant for them.
5.2.2 Expansion tank
Test sequence:
Check the oil level of the compartment(s).
Check the priming of the non-return valve.
5.2.3 Drains
Test sequence:
Check the drains of the upper points.
5.2.4 Air dryer
Test sequence:
Check proper colour of the desiccant, presence of proper oil level in the dehydrating (desiccant)
breather.
5.2.5 Oil Leaks
Test sequence:
Check the entire transformer for oil leaks.
5.2.6 General
Test sequence:
More generally, carry out all other checks listed on test certificates.
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Site Commissioning Procedure
For Power Transformer Field Testing
Identification number
1AHA608688
DRAFT
6 PRE-COMMISSIONING
The following section describes all tests to be carried out on transformers prior to start any live
integrated commissioning activities.
6.1 EARTH RESISTANCE CHECKS
Test sequence:
Check that connections to earth are properly made.
Measure the resistance between tank and ground connection and tank and bushing flange with a
battery-driven ohmmeter on at least 4 different locations.
Record results on test certificates.
6.2 TRANSFORMER ACTIVE PART CHECKS
6.2.1 Insulation Measurement Tests
6.2.1.1 Core / Tank (if test link is provided)
The purpose of this test is to ensure that the core to tank insulation has not sustained any damage
whilst in transit and installation.
Test sequence:
Disconnect the earth links from the core and tank earthing terminalsMegger with appropriate voltage (500V to 1kV) for one minute between the following terminals:
∙ Core to Earth
∙ Core to Tank
∙ Tank to Earth
Record results on test certificate (minimum acceptable value is > 1k/V).
Reconnect the earth links to the core and frame terminals.
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Site Commissioning Procedure
For Power Transformer Field Testing
Identification number
1AHA608688
DRAFT
6.2.1.2 Windings
Before starting the test, disconnect Neutral Star Point Earth connections and any measurement
devices such as PT's (where applicable).
Test sequence:
Megger with appropriate voltage (500V to 2.5 kV) for one minute between the following terminals:
For two-winding transformer
∙ HV and LV
∙ HV and earth
∙ LV and earth
For three-winding transformers
∙ HV and LV1
∙ HV and LV2
∙ LV1 and LV2
∙ HV and earth
∙ LV1 and earth
∙ LV2 and earth
Record results on test certificate (minimum acceptable value is > 1k/V).
6.2.2 Voltage Ratio Measurement
Test sequence:
Ensure that HV and LV connections are disconnected (or isolated).
Connect a 3-phase 400 VAC source on the HV terminals.
Measure and record simultaneously voltages on the HV and LV terminals.
Calculate HV / LV ratios.
Record results on test certificates.
Notes:
As per contract requirement, this test may be required for different transformer tap positions (see the
relevant Transformer Inspection and Test Plan for details).
If Automated Transformer Analyser equipment (i.e. Doble) is available on site, the use of it will be a
valuable alternative method to carry out the tests mentioned above.
6.2.3 Three-Phase No-Load Current with Low Voltage Supply
Test sequence:
Supply the HV or LV windings with three-phase 230 or 400 V AC.
Measure the current with 3 digital millimetres, for at least three positions.
Record results on the test certificates.
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Site Commissioning Procedure
For Power Transformer Field Testing
Identification number
1AHA608688
DRAFT
6.3 AUXILIARY CIRCUIT CHECKS
6.3.1 Auxiliary Circuit Insulation Test
Test sequence:
Apply for one minute a test voltage of 500 VDC (max.) to:
Wiring to earth.
Pump motors to earth.
Fan motors to earth.
Record results on test certificate (minimum acceptable value is > 1k/V).
6.3.2 Auxiliary Operation Test
Test sequence:
Supply the power and control circuits with the nominal voltage and check:
The phase sequence with phase sequence tester.
The settings for over- and under voltage supervision (if applicable).
The correct rotation of fans and / or pumps visually.
The current of fans and pumps.
The starting sequences (with chronometer).
The proper operations of the oil flow indicator (if applicable).
The local control cabinet hater is connected and in operation.
The thermal overcurrent protection relays of the motors are set according to the rated -current
that is stamped on the rating plate.
Record results on test certificate.
6.3.3 Protective relay (Buchholz)
Test sequence:
Check at the terminals of the cabinet that the Buchholz
manually activated (e.g. with test push-button) with the device
intended for this purpose, transmits electrically the indicating of
its operation according to the electrical diagram (alarm and
tripping).
Record results on test certificates.
Figure 2: Simplified Buchholz relay on transformer.
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Site Commissioning Procedure
For Power Transformer Field Testing
Identification number
1AHA608688
DRAFT
6.3.4 Tap-changer protective relay
Test sequence:
Check at the terminals of the cabinet that the protective relay manually activated (e.g. with test push-
button) with the device intended for this purpose, transmits electrically the indicating of its operation
according to the electrical diagram (alarm and tripping).
Record results on test certificates.
6.3.5 Pressure relief valve
Test sequence:
Check the values indicated to the cover.
Check the position indicator.
Test the contact (if there is one).
Record results on test certificates.
Figure 3: Simplified pressure reliefe valve.
6.3.6 Oil level indicator
Test sequence:
Check at the terminals of the cabinet the signals for low and high level of the transformer and tap-
changer compartment.
Record results on test certificates.
6.3.7 Oil thermometer indicator
Test sequence:
Check the device according to the manufacturer’s service manual.
Check oil temperature readings against winding temperature. It should be the same.
Record results on test certificates.
6.3.8 Winding thermometer indicator
Test sequence:
Standardizat ion and ver i f ication o f prop er operat ion are checked at the factory.
Check manually, with the mechanical test device integrated to the apparatus, the closing of the
different circuits, and the proper electrical transmission of commands according to the electrical
diagram.
The modif icat ion o f the ini t ial sett ing of the heating circui t , ei ther at the transformer for th e adjustment
current or at the adjustm ent resistance, can only be carr ied out with the agreement of the factory.
Check winding temperature readings against oil temperature. It should be the same.
If presence of transducer, check that the output mA is showing the correct value.
Record results on test certificates.
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Site Commissioning Procedure
For Power Transformer Field Testing
Identification number
1AHA608688
DRAFT
6.3.9 Fire detectors
Test sequence:
Check that the fire fighting system is completed and tested.
Check that the distance between the HV bushings and fire fighting system are sufficient.
6.4 CURRENT TRANSFORMERS
Perform the testing according to the “site commissioning procedure for CT and VT field testing”.
GAS/00/E/153B---002/TP/102
Note:
Take care for voltage induced to the other windings during this checks.
6.5 TAP-CHANGERS
6.5.1 Off circuit tap-changer (OCTC)
Test sequence:
Check the locking in each position.
Check the electrical position indicator of each position.
Record results on test certificates.
WARNING
The OCTC shall be operated ONLY when the transformer is Off-Circuit, i.e., totally isolated
from the power supply, otherwise there can be heavy arcing at tap connections which canresult in a fire / explosion hazard.
Remark:
Means of protecting the OCTC’s from unauthorised operation is provided by using
pad-locking arrangement at designated tap position.
Figure 4:Off Circuit Tap-Changer (OCTC) safety padlock.
6.5.1.1 Pre-operational checks
Test sequence:
Using the emergency crank, bring the motor drive unit to a position distant from the extreme positions
(middle position).
Check the similarity of the displayed switches and make sure that the tap-changer head and the
selector switch rotate before the motor drive unit does.
Check that the motor drive unit and the tap-changer turn in the same direction.
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Site Commissioning Procedure
For Power Transformer Field Testing
Identification number
1AHA608688
DRAFT
6.6 POWER CABLES AND CONNECTIONS
6.6.1 HV / MV cables and bus bar links
Test sequence:
Ensure that connections to lines, bus bars are properly made and tightened by erection.
Check that shield grounding of the cables is in accordance with the grounding concept.
Check that all cables connected to bushings are properly supported.
7 COMMISSIONING
The following section describes all steps to be followed in order to commission in proper and
methodical manner the power transformer.
7.1 BEFORE THE ENERGISATION
Before energizing the transformer, it should be visually inspected and the following items checked:
The oil level in the oil filled compartments.
The drying agent and the oil level in the dehydrating breather.
Check that all valves are set at the right position and locked, where applicable.
Check that the gas-operated relay is purged of air.
Check for possible leakage.
Check that all temporary grounds have been removed from conductors.
All protective, alarm and monitoring circuits are operational and in service. Check that all CT secondary circuits are closed.
The automatic cooling control of the transformer is in operation.
The on-load tap changer control is selected to REMOTE operation.
Record ambient conditions, oil and winding temperatures.
Ensure that oil samples are correctly taken and the result is accepted.
Ensure that the area is made secure and suitable warning notices are in place.
Ensure that fire fighting / deluge system is available and operational.
Ensure that all equipment have been restored to suitable state and ensure that the
documentation due for permanent energization of transformers, as per site management rules,
is available and signed by all relevant parties.
Record results on test certificates.
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Site Commissioning Procedure
For Power Transformer Field Testing
Identification number
1AHA608688
DRAFT
7.2 FIRST ENERGISATION – NO LOAD CHECKS
WARNING
When the place is secure, proceed with transformer energization by closing remotely (no exception
allowed) the corresponding circuit breaker.
DANGER
Never climb up on a transformer, while it is energized!
After energizing, the transformer has to be kept under careful observation:
Observe and record oil, winding and ambient temperature for the first 24 hours.
Observe current, load (MW / MVAr) and voltage.
Watch for unusual noise.
Watch particularly for any sudden changes.
Reset maximum indicating pointer of temperature Indicators (if applicable).
Take oil samples for Gas-In-Oil Analysis according to ITPL.
Record results on the test certificates / add the DCS 24h trend.
7.3 HOT COMMISSIONING (ON LOAD CHECKS)
After reaching nominal load for at least 8 hours:
Observe and record oil, winding and ambient temperature.
Watch for unusual noise.
Watch particularly for any sudden changes.
Reset maximum indicating pointer of temperature Indicators (if applicable).
Take oil samples for Gas-In-Oil Analysis according to ITPL.
Record results on the test certificates / add the DCS 8h trend.
7.4 RECORDS
All test records shall be filed in accordance with the Site Quality Plan.
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Site Commissioning Procedure
For Power Transformer Field Testing
Identification number
1AHA608688
DRAFT
8 ANNEX
8.1 TRANSFORMER CONNECTIONS
Extract from IEC 60076-1: Power Transformers – Part 1 – General, Annex D
Figure 5: Three-phase transformer connections
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Main Contractor
Alstom Switzerland) Ltd. , Brown Boveri Strasse 7, CH 5401-Baden Replaces Customer Code ALSTOM Document Code
GAS/00/E/153B---002/TP/102Responsible dept.
GSEEECreated by
Schuele N.Checked by
Hug R. Approved by
Huser J.Format
A4Originator Document Type
Test ProcedureDocument Status
Electronically releasedTitle, Subtitle
Site Commissioning Procedure
For CT and VT Field Testing
Identification number
1AHA608717Rev.
ADate
23 08 2012Lang.
enSheet
1/18
SITE COMMISSIONING PROCEDURE
FOR CT AND VT FIELD TESTING
Projects and Customer’s Information:
Plant Name, Project:
Customer:
Acceptance Authority:
Customer Order No.: ALSTOM Order No.:
Notification Periods: Measuring System:
QA coordination:
Space for Stamping (Review and Validation status)
Cross checked
Department Name Date Signature
Revision History
Rev. Revision Date Created by Checked by Approved by Brief Description
ADescription current Revision:
First Issue
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Site Commissioning Procedure
For CT and VT Field Testing
Identification number
1AHA608717
The inspection and test plan does not release the subcontractor / manufacturer from his obligation to take all steps necessary to
Table of Content
1. INTRODUCTION 3
1.1 PURPOSE 3
1.2 AREA OF APPLICATION 3
1.3 REFERENCE DOCUMENTS 3
1.4 ABBREVIATIONS 3
2. SAFETY SYMBOLS 4
3. LIST OF COMMISSIONING TOOLS 5
4. HEALTH AND SAFETY 5
4.1 SPECIAL SAFETY PRECAUTION 5
5. COMMISSIONING 6
5.1 DATA RECORDING AND VISUAL INSPECTION 6
5.2 INSULATION MEASUREMENTS 6
5.3 RATIO CHECK 7
5.4 POLARITY CHECK 10
5.5 CT MAGNETIZING CHARACTERISTIC 14
5.6 BURDEN AND OHMIC CT-WINDING RESISTANCE MEASUREMENT 16
6. LITERATURE 17
7. ANNEX 18
7.1 TRANSFORMER RESTRICTED E/F (REF) PROT. 87NT, HIGH IMPEDANCE 18
List of Figures
Figure 1: CT ratio check with primary current injection 7
Figure 2: Multiplying the primary current by looping the test leads several times 7
Figure 3: CT ratio check on a multi-core CT 8
Figure 4: CT ratio check with secondary voltage injection 8
Figure 5: Ratio check with secondary voltage injection on a built in transformer CT 9
Figure 6: VT ratio check with primary voltage injection 9
Figure 7: CT polarity check with DC current source 10
Figure 8: CT polarity check with secondary voltage injection on a transformer bushing CT 11
Figure 9: VT polarity check with DC current source 12
Figure 10: VT polarity check with primary voltage injection 13
Figure 11: CT magnetizing characteristic measurement with secondary voltage injection 14
Figure 12: CT magnetizing characteristic 15
Figure 13: CT/VT burden measurement with secondary voltage injection 16
Figure 14: Ohmic winding resistance measurement of CT 17
Figure 15: Example to test 87NT with high impedance measuring principle and relay O/C function. 18
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Site Commissioning Procedure
For CT and VT Field Testing
Identification number
1AHA608717
The inspection and test plan does not release the subcontractor / manufacturer from his obligation to take all steps necessary to
1. INTRODUCTION
1.1 PURPOSE
The intention of this procedure is to make an efficient and safe testing of CT’s and VT’s.
This Document contains detailed information and instructions about the testing of current and
voltage transformers and the user has to read it carefully and thoroughly before starting the test.
By the end of this procedure the following goals will have been met:
All CT’s tested
All VT’s tested
1.2 AREA OF APPLICATION
The procedure is applicable to current and voltage transformers.
1.3 REFERENCE DOCUMENTS
System commissioning ITPL, including test certificates.
Equipment schematic diagrams.
Plant specific single line / protection single line diagram.
Test certificates for CT and VT
Factory test certificates
1.4 ABBREVIATIONS
Abbrev. Meaning
AC Alternating Current
DC Direct Current
CT Current Transformer
VT Voltage Transformer
Un Nominal Voltage
In Nominal CurrentH&S Health and Safety
ITPL Inspection and Test Plan
P&ID Process and Instrumentation Diagram
Q&A Questions and Answers
QA Quality Assurance
TOP Turn Over Packages
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Site Commissioning Procedure
For CT and VT Field Testing
Identification number
1AHA608717
The inspection and test plan does not release the subcontractor / manufacturer from his obligation to take all steps necessary to
2. SAFETY SYMBOLS
The user has to consider the following symbols used within this document:
DANGER
Danger indicates an imminently hazardous situation that if not avoided, will result in deathor serious injury. This signal word is to be limited to the mostextreme situations.
WARNING
Warning indicates a potentially hazardous situation that if not avoided, could result indeath or serious injury.
CAUTION
Caution indicates a potentially hazardous situation that if not avoided, may result in minoror moderate injury.It may also be used to alert against unsafe practices.
Note
Note indicates an important instruction or the best practices. It may also be used to alertagainst mechanical damage to the equipment.
DANGER
High voltage / Electrical shockHazard of electrical shock if carry out work on life electrical systems will causedeath or major injury.
Apply the 5 safety rules when working at any electrical equipment:
- Isolate
- Lock out / Tag out
- Check voltage free state
- Apply earth and short-circuit
- Cover or block neighboring energized equipment and areas
Avoid wet surfaces!
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Site Commissioning Procedure
For CT and VT Field Testing
Identification number
1AHA608717
The inspection and test plan does not release the subcontractor / manufacturer from his obligation to take all steps necessary to
3. LIST OF COMMISSIONING TOOLS
The following is a list of the main test equipment necessary in order to carry out all the testing of the
equipment covered by this procedure:
Insulation resistance tester (Megger) 500VDC
Variable current- / voltage source
(Capacity according nameplate of CT / VT, current source: 0-100A, voltage source: 0-300V)
Voltage transformer to increase the range of the voltage source if necessary. E.g. 0.1 / 3kV.
Current clamp
Digital Multimeter
Analogue volt- / ammeter (with center zero position)
Battery (e.g. 6V from commissioning tools)
Test leads CT-Tester (optional / if available)
Note: Tools, which need to be calibrated, must have a valid calibration certificate traceable to
internationally accepted standards.
4. HEALTH AND SAFETY
The work outlined in this procedure must only be carried out by persons who are competent and
appropriately qualified engineers in the appropriate disciplines. These persons shall:
Be aware of all Site Safety Procedures & Statutory Regulations and fully comply with them. Recognize the hazards, which can arise when working on energized apparatus and take all
necessary precautions.
Recognize the hazards of induced current and take all necessary precautions.
Ensure that two people are always present when working with live equipment.
Use approved tools and equipment.
Wear always your personal protective equipment.
4.1 SPECIAL SAFETY PRECAUTION
When work is performed on equipment connected to the system, proper earthing tools must be
installed on HV & LV sides and the isolation boundaries of the test area must be clearly defined.
Before any voltage or current injection, check that all Current Transformer sec. circuits are closed.
Special attention shall be paid to:
That no part is accidentally energized by VT primary injection and during megger-testing.
That no current is injected in any circuits accidentally (danger of equipment damage or faulty
trips).
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Site Commissioning Procedure
For CT and VT Field Testing
Identification number
1AHA608717
The inspection and test plan does not release the subcontractor / manufacturer from his obligation to take all steps necessary to
5. COMMISSIONING
5.1 DATA RECORDING AND VISUAL INSPECTION
The CT’s /VT’s shall be first inspected visually. Special attention shall be paid to any damage that
could have occurred during transport or installation.
Check also (as applicable)
the support structures,
the tightness of the transformers and
the electrical connections.
The data of the transformers shall be taken directly from its nameplate (if applicable) then compared
with the requirements and recorded on the test certificate.
5.2 INSULATION MEASUREMENTS
Test the secondary windings of the transformers with a Megger (500VDC). Ground connections inthe primary or secondary loop shall be disconnected first.
CT: secondary winding ground (+ primary winding)
VT: secondary winding ground + primary winding
The readings should not be below 1 MOhm, if not indicated by manufacturer.
Where reasonable, also the primary winding of a VT should be “meggered” (in many cases, the
grounding cannot be removed and thus an insulation test is not possible). The primary winding must
be “meggered” in every case where a damage is suspected.
VT: primary winding ground + secondary winding
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Site Commissioning Procedure
For CT and VT Field Testing
Identification number
1AHA608717
The inspection and test plan does not release the subcontractor / manufacturer from his obligation to take all steps necessary to
5.3 RATIO CHECK
5.3.1 CT RATIO CHECK
Injection of a primary current and simultaneous measuring of the secondary current.
Test sequence:
Set up the test / measuring equipment according to figure1.
Check if secondary CT circuit is closed! Check also the fuse of Ammeter.
Adjust current-source to minimum and switch it on.
Increase the primary current slowly by watching the secondary current indication. If no
secondary current or a current other than the expected one is showing switch off the current
source and recheck the set up.
Increase the primary current to a stable value and take the reading.
Figure 1: CT ratio check with primary current injection
Due to the capacity of the test equipment, normally only a current far below the CT nominal current
can be injected. In case of a doughnut - CT, the primary current can be multiplied by looping the test
leads several times through the CT (see figure 2).
Figure 2: Multiplying the primary current by looping the test leads several times
Variablecurrent
source
A
Variablecurrentsource
A A
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Site Commissioning Procedure
For CT and VT Field Testing
Identification number
1AHA608717
The inspection and test plan does not release the subcontractor / manufacturer from his obligation to take all steps necessary to
For CT’s with more than one core, the remaining circuits must be shortened (never operate a CT
with an open secondary circuit!)
When more than one core exists, all cores can be
tested simultaneously, see figure 3
Figure 3: CT ratio check on a multi-core CT
5.3.2 ALTERNATIVE CT RATIO CHECK OR VOLTAGE METHODIn some situations it might be difficult injecting a primary current to check the CT ratio (e.g. bushing
CTs). In this case it is possible to inject a voltage on the CT secondary side and measure the
voltage on the primary side. The voltage ratio is the inverse of the current ratio.
ondary
primary
primary
ondary
I
I
U
U
sec
sec = CT-turns ratio
A relatively low voltage (e.g. 50 -100 V AC) is sufficient. Take care that the saturation voltage must
not be reached in any case!
Test sequence:
Set up the test / measuring equipment according to figure 4.
Increase the secondary voltage slowly to the desired value.
Read and record the primary voltage
Figure 4: CT ratio check with secondary voltage injection
Variable
current
source
A
A A A
Variable
voltage
source
V
V
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Site Commissioning Procedure
For CT and VT Field Testing
Identification number
1AHA608717
The inspection and test plan does not release the subcontractor / manufacturer from his obligation to take all steps necessary to
The figure below shows the testing configuration as an example on a built in transformer CT.
Figure 5: Ratio check with secondary voltage injection on a built in transformer CT
5.3.3 VT RATIO CHECK
To check the VT ratio, a voltage on primary side shall be injected and the voltage at secondary side
must be measured simultaneously.
To avoid accidentally energizing of any parts, the VT must be disconnected from the busbar (or the
part of the busbar must be insulated from neighbouring equipment.
Test sequence:
Set up the test / measuring equipment according to figure 6.
Raise the primary voltage slowly to the desired value.
Read and record the secondary voltage.
Figure 6: VT ratio check with primary voltage injection
Variable
voltage
source V
V
PowerTransformer
Windings
Busbar
Disconnected!
Variable voltage sourc
V V
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Site Commissioning Procedure
For CT and VT Field Testing
Identification number
1AHA608717
The inspection and test plan does not release the subcontractor / manufacturer from his obligation to take all steps necessary to
5.4 POLARITY CHECK
5.4.1 CT POLARITY CHECK WITH A DC SOURCE
In many applications, the right polarity is essential for their correct functioning (power measurement,
differential protection, etc.).
Before starting with the test, the designations and locations for P1, P2 and S1, S2 must be
compared between the diagram and the field.
The test has the purpose to verify the corresponding polarity like they are supposed to be according
the diagram.
Verifying this, it is not essential in which energy flow direction the designations for P1 and P2 are
located. Important is that the primary designation P1 corresponds with the secondary designation
S1 (and P2 with S2)!
To check the polarity, a DC-source is switched on and off to the primary side of the CT. As thismeans practically a short circuit for the current source, it must be short circuit proven. A suitable
source can be a battery (e.g. 6 or 9V) with low capacity that is connected over a push button to the
CT (Instead of a push button, the contact can be achieved by plugging in and out a prepared cable).
To limit the current, it might be necessary to connect a resistor in series.
When closing the circuit, the meter on the CT secondary side shows a positive current peak, when
opening the circuit, the meter on the secondary side shows a negative current peak. To measure
this, an analogue meter with centre zero position suits best.
(Variation: Instead of current, the voltage can be measured on the CT secondary side with the same
result).
Test sequence:
Set up the test / measuring
equipment according to figure 7.
Close the primary circuit with the
push button positive peak on
secondary side.
Open the primary circuit
negative peak on secondary side.
Record the results and verify with
the diagram.
Figure 7: CT polarity check with DC current source
For valid results, the correct polarity of the test connections is essential!
R (option)
_ + DC current
source
P1
P2 S2
S1
V
+ A
Push-
button
Analogue
meter
_
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Site Commissioning Procedure
For CT and VT Field Testing
Identification number
1AHA608717
The inspection and test plan does not release the subcontractor / manufacturer from his obligation to take all steps necessary to
5.4.2 CT POLARITY CHECK WITH SECONDARY VOLTAGE INJECTION
As an alternative, the polarity can also be verified with the voltage method. It is a faster way, when
the ratio was checked with the voltage method beforehand.
The principle is based on the addition of the voltages. When the polarity is correct, i.e. according our
expectations, the measuring voltage Um is the sum of the CT secondary voltage U1 and the CT
primary voltage U2. If the polarity were wrong, the measuring voltage Um would be the difference
between U1 and U2.
k
U U
12 k= CT - turns ratio
Figure 8: CT polarity check with secondary voltage injection on a transformer bushing CT
Test sequence:
Set up the test / measuring equipment according to figure 8.
Increase the secondary voltage U1 slowly to the desired value.
Record the voltages U1, U2 and Um correct polarity if Um = U1 + U2.
Switch off the voltage source
Remark:
Double-check the result: swapping the cables “a” and “b” between L1 and L2 can change the
direction of U2. This "wrong polarity" results then in Um = U1 - U2.
A valid measuring result can only be achieved if the set up is done carefully, with correctpolarities of all connections!
ba
U1
Um
U2
L3L2L1
P1
P2
Um
Um
U2
U1
U2U1
Variable
voltagesource, AC
V
V Um = U1 + U2 (correct polarity)
V
Um = U1 – U2
( wrong polarity
PowerTransformer
Windings
S2 S1
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Site Commissioning Procedure
For CT and VT Field Testing
Identification number
1AHA608717
The inspection and test plan does not release the subcontractor / manufacturer from his obligation to take all steps necessary to
5.4.3 VT POLARITY CHECK WITH A DC SOURCE
This test is similar to the CT polarity check.
Test sequence:
Set up the test / measuring equipment according to figure 9.
Close the primary circuit with the push button positive peak on secondary side.
Open the primary circuit negative peak on secondary side.
Record the results and verify with the diagram.
For valid results, the correct polarity of the test connections is essential!
Figure 9: VT polarity check with DC current source
R (option)
_
+
Busbar
_ +
DC currentsource
P1
P2 S2 V
Pushbutton
Analogue
meter
Disconnected!
V
S1
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Site Commissioning Procedure
For CT and VT Field Testing
Identification number
1AHA608717
The inspection and test plan does not release the subcontractor / manufacturer from his obligation to take all steps necessary to
5.5 CT MAGNETIZING CHARACTERISTIC
To verify the CT-type, i.e. metering or relaying (for protection), the magnetizing characteristic
(excitation characteristic) shall be measured. The purpose of this test is to decide if the correct CT-
type is installed.
On the secondary side of the CT, a voltage source must be connected. According to the CT
characteristic, the necessary voltage can vary from 200 Vac up to 800Vac.
To reach this level, the different sources on the test device must be connected in series (e.g. on the
Sverker). If this is not enough, it might be necessary to connect an additional transformer in series
to the variable voltage source.
It has to be ensured that the primary circuit of the CT is open (e.g. no closed loop over generator
windings).
The characteristic of the CT, respectively its saturation voltage must be known beforehand (factory
test sheet).
Test sequence:
Set up the test / measuring equipment according to figure 11.
Make sure, the CT primary circuit is not shorted.
Increase the voltage slowly close to the saturation value.
CAUTION
Close to the saturation voltage, the current will increase nonlinear and rapidly!
At this point the voltage must not be increased further! Absolute maximum is IN of CT.
Record the values for voltage and current
Decrease the voltage stepwise down to zero and record the values for voltage and current.
Compare the measurement results with the factory data.
Figure 11: CT magnetizing characteristic measurement with secondary voltage injection
Variable
voltage
source
V
A
Transformer
100/3000V
(optional)
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Site Commissioning Procedure
For CT and VT Field Testing
Identification number
1AHA608717
The inspection and test plan does not release the subcontractor / manufacturer from his obligation to take all steps necessary to
The figure below shows a CT magnetizing characteristic as an example.
The voltage and current values are for illustration only and do not give any fixed limitations. This
depends on the CT-type.
Figure 12: CT magnetizing characteristic
Note:
Field-testing cannot be that accurate. Therefore the measured values for current can deviate
considerably from the curve obtained at the factory.
Important is the verification of the saturation voltage. With this result, the significant difference
between metering- and protection CT’s can be noticed.
CT secondary excitation characteristic
1
10
100
1000
V o l t s
AmperesRestricted range for test Measuring range
0.001 0.01 0.02 0.03 0.05 0.07 0.1 0.5 10 100
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Site Commissioning Procedure
For CT and VT Field Testing
Identification number
1AHA608717
The inspection and test plan does not release the subcontractor / manufacturer from his obligation to take all steps necessary to
5.6 BURDEN AND OHMIC CT-WINDING RESISTANCE MEASUREMENT
5.6.1 BURDEN MEASUREMENT
This measurement serves to verify the external burden, connected to the CT and VT in normal
operation. Before injection, a target / loop check of the cables must be done.
The injection shall be done with nominal values.
E.g. CT-ratio 12000/5A injection 5A and VT-ratio 21000/120V injection 120V
The injection has to be done close to the CT / VT in order to measure the whole secondary circuitburden. With the measured values for voltage and current, this burden, in VA, must be calculated.This amount of the external burden shall not exceed the value given on the nameplate. (In contraryor when doubts remain, the engineering department shall be informed.)
Test sequence:
Set up the test / measuring equipment according to figure 13.
Increase the voltage / current slowly to the nominal value.
Record the values for voltage and current.
CAUTION
When doing burden measurements, the effect of the injection has to be thought beforehand.
E.g. generator protection functions could be activated!
Figure 13: CT/VT burden measurement with secondary voltage injection
CT or
VT
Variable
source
V
Load
e.g. Gen. prot.
Metering,..
A
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Site Commissioning Procedure
For CT and VT Field Testing
Identification number
1AHA608717
The inspection and test plan does not release the subcontractor / manufacturer from his obligation to take all steps necessary to
5.6.2 OHMIC CT- WINDING RESISTANCE MEASUREMENT
At this stage, also the ohmic winding resistance (secondary) of the CT shall be measured andrecorded.
Measure the CT-secondary value with an ohmmeter.
Record the values and compare them with the factory test results.
Figure 14: Ohmic winding resistance measurement of CT
6. LITERATURE
ANSI/IEEE Standard C57.13.1-1981: IEEE Guide for field testing of relaying current transformers.
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Site Commissioning Procedure
For CT and VT Field Testing
Identification number
1AHA608717
The inspection and test plan does not release the subcontractor / manufacturer from his obligation to take all steps necessary to
7. ANNEX
7.1 TRANSFORMER RESTRICTED E/F (REF) PROT. 87NT, HIGH IMPEDANCE
This measurement serves to verify the wiring of the built-in CT’s for the protection function 87NT.
With this arrangement the test voltage can only be connected outside the protected zone.
Figure 15: Example to test 87NT with high impedance measuring principle and relay O/C function.
Test sequence:
Set up the test / measuring equipment according to Figure 15 .
Turn on the power supply and measure the current in each CT and to the relay.
With a correct wiring and CT polarity the summation current to the relay is theoretically zero mA.
But in practice there will be a small difference because of production differences of the different CT’s.
Description I primary L1 sec. L2 sec. L3 sec. N sec. Relay
Power supply on L1 … A … mA 0 mA 0 mA … mA ≈ 0 mA
Power supply on L2 … A 0 mA … mA 0 mA … mA ≈ 0 mA
Power supply on L3 … A 0 mA 0 mA … mA … mA ≈ 0 mA
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Cross checkedDepartment Name Date Signature
Replaces Derived from ALSTOM Document Code
GGG/00/E/TEC-------/TP/404Responsible dept.
PEI FRCreated by
S. BaderChecked by
M. André Approved by
H. DoulatFormat
A4Legal Owner
abcdPT-PEPlant Business
Document Type
Test ProcedureDocument Status
ApprovedTitle, Subtitle
Commissioning ProcedureFor Neutral Earthing Resistor
Field Testing
Identification number
PSP29A43047Rev.
ADate
15.01.2007Lang.
enSheet
1/7
Template No.: GGG/00/-/EQA---/FT/303D (released with Work Instruction GGG/00/-/EQA---/WI/306)© ALSTOM 2012. All rights reserved.
Electrical Commissioning Engineering Manual
Site Commissioning ProcedureFor Neutral Earthing Resistor Field Testing
Table of Contents:
1
PURPOSE ................................................................................................................ 2
2 AREA OF APPLICATION .......................................................................................... 2
3 REFERENCE DOCUMENTS........................................................................................ 2
4
TERMINOLOGY – DEFINITION – ABBREVIATIONS .................................................. 2
5 LIST OF COMMISSIONING EQUIPMENTS ............................................................... 3
6
HEALTH AND SAFETY .............................................................................................. 4
7
SPECIAL SAFETY PRECAUTION ................................................................................ 4
8 PRE-COMMISSIONING ........................................................................................... 5
9
COMMISSIONING................................................................................................... 7
Revision HistoryRev. Revision Date Created by Checked by Approved by Description
A 15.01.2007 S. BADER M. ANDRE H. DOULAT First issueDescription latest Revision:
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Legal Owner
ALSTOM PT-PE / Plants Business
Identification number
PSP29A43047
Rev.
A
Date
15.01.2007
Lang.
en
Sheet
2/7© ALSTOM 2012. All rights reserved..
1 PURPOSE
This instruction serve as a base to perform commissioning tests for neutral earthingresistors. All tests described herein must be performed in de-energised and groundedconfiguration only. The site specific safety regulations shall be followed by all means.
2 AREA OF APPLICATION
It covers the field testing of neutral earthing resistors at an HV switchyard or at a powerplant.
3 REFERENCE DOCUMENTS
" Neutral earthing resistor " manufacturer service manual.
" Neutral earthing resistor " test certificate.
Plant specific single line.
Equipment specific diagram.
4 TERMINOLOGY – DEFINITION – ABBREVIATIONS
HV: High Voltage.
LV: Low Voltage.
Un: Nominal voltage.
In: Nominal current.
U0: Rated r.m.s power frequency voltage between conductor and screenor sheath for which the cable is designed
U: Rated r.m.s power frequency voltage between any two conductors forwhich the cable is designed.
Um: Maximum r.m.s power frequency voltage between any two conductors forwhich the cable is designed. It is the highest voltage that can be sustained
under normal operating conditions at any time and at any point in
the system.
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Legal Owner
ALSTOM PT-PE / Plants Business
Identification number
PSP29A43047
Rev.
A
Date
15.01.2007
Lang.
en
Sheet
3/7© ALSTOM 2012. All rights reserved..
5 LIST OF COMMISSIONING EQUIPMENTS
The following is a list of the main equipment necessary in order to carry out all the
testing of the equipment covered by this procedure.
- Warning/Caution Notices.
- Anti-personnel barriers.
- Thermometer.
- Hydrometer.
- Insulation tester 500 V - 5 kV
- Milliohmmeter
Note: All test equipment used must have a current calibration certificate traceable tointernationally accepted standards.
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Legal Owner
ALSTOM PT-PE / Plants Business
Identification number
PSP29A43047
Rev.
A
Date
15.01.2007
Lang.
en
Sheet
4/7© ALSTOM 2012. All rights reserved..
6 HEALTH AND SAFETY
- The work outlined in this procedure must only be carried out by persons who arecompetent in the appropriate disciplines. These persons shall:
- Be aware of all Site Safety Procedures & Statutory Regulations and fully comply withthem.
- Recognise the hazards, which can arise when working on energised apparatus andtake all necessary precautions.
- Ensure that two people are always present when working with live equipment.
- Use approved tools and equipment.
- Wear the following safety equipment as appropriate to the area and nature of thework :
. Safety Helmet
. Safety Footwear
7 SPECIAL SAFETY PRECAUTION
Not applicable
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Legal Owner
ALSTOM PT-PE / Plants Business
Identification number
PSP29A43047
Rev.
A
Date
15.01.2007
Lang.
en
Sheet
5/7© ALSTOM 2012. All rights reserved..
8 PRE-COMMISSIONING
The following section describes all tests to be carried out on neutral earthing resistor
prior to start any live integrated commissioning activities.
8.1 DATA RECORDING AND VISUAL INSPECTION
The neutral earthing resistor shall be first inspected visually. Special attention shall bepaid to any damage that could have occured during transport or installation.
8.2 RESISTOR CHECKS
Test sequence :
- Disconnect the cable and the earth link.
- Using the insulation tester set at 2.5 kV measure the insulation resistance between theresistor terminals and earth.
The minimum acceptable value is > 1k
/V with V = ref. to Uo
- Measure the value of the neutral earthing resistor using a milliohmmeter.
- Re-connect the cable and the earth link.
- Record the result on the test certificate.
8.3 CURRENT TRANSFORMERS :
The ratios and polarities of the current transformer are checked at the factory.
Perform testing of the Current Transformers following commissioning instructionGGG/00/E/TEC-------/TP/403.
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Legal Owner
ALSTOM PT-PE / Plants Business
Identification number
PSP29A43047
Rev.
A
Date
15.01.2007
Lang.
en
Sheet
6/7© ALSTOM 2012. All rights reserved..
8.4 EARTHING CIRCUIT CHECKS
Test sequence :
- Check the earthing circuit installation is complete.
- Record the result on the test certificate.
8.5 AUXILIARY CIRCUIT CHECKS
Test sequence :
- Check and confirm the operation of the anti-condensation heaters (if applicable).
- Ensure that all bolted access covers are replaced and secured.
- Ensure that the neutral earthing cubicle is free from water / oil ingress.
- Record the result on the test certificate.
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Legal Owner
ALSTOM PT-PE / Plants Business
Identification number
PSP29A43047
Rev.
A
Date
15.01.2007
Lang.
en
Sheet
7/7© ALSTOM 2012. All rights reserved..
9 COMMISSIONING
The following section describes all steps to be followed in order to commission in properand methodical manner the neutral earthing resistor.
9.1 BEFORE THE ENERGISATION
Ensure that all equipments have been restored to suitable state and ensure thatdocumentation due for permanent energisation of neutral earthing resistor, as per sitemanagement rules, is available and signed by all relevant parties.
9.2 AFTER THE ENERGISATION
Ensure that no alarm relative to neutral earthing resistor ( in stable or operating state) is
coming to the Control System.
9.3 RECORDS
All test records shall be filed in accordance with the Site Quality Plan.
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Cross checkedDepartment Name Date Signature
Replaces Derived from ALSTOM Document Code
GGG/00/E/TEC-------/TP/405Responsible dept.
PEI FRCreated by
S. BaderChecked by
M. André Approved by
H. DoulatFormat
A4Legal Owner
abcdPT-PEPlant Business
Document Type
Test ProcedureDocument Status
ApprovedTitle, Subtitle
Commissioning ProcedureFor HV Surge Arrester
Field Testing
Identification number
PSP29A43042Rev.
ADate
15.01.2007Lang.
enSheet
1/6
Template No.: GGG/00/-/EQA---/FT/303D (released with Work Instruction GGG/00/-/EQA---/WI/306)© ALSTOM 2012. All rights reserved.
Electrical Commissioning Engineering Manual
Site Commissioning ProcedureFor HV Surge Arrester Field Testing
Table of Contents:
1
PURPOSE ................................................................................................................ 2
2 AREA OF APPLICATION .......................................................................................... 2
3 REFERENCE DOCUMENTS........................................................................................ 2
4
TERMINOLOGY – DEFINITION – ABBREVIATIONS .................................................. 2
5 LIST OF COMMISSIONING EQUIPMENTS ............................................................... 3
6
HEALTH AND SAFETY .............................................................................................. 4
7
SPECIAL SAFETY PRECAUTION ................................................................................ 4
8 PRE-COMMISSIONING ........................................................................................... 5
9
COMMISSIONING................................................................................................... 6
Revision HistoryRev. Revision Date Created by Checked by Approved by Description
A 15.01.2007 S. BADER M. ANDRE H. DOULAT First issueDescription latest Revision:
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Legal Owner
ALSTOM PT-PE / Plants Business
Identification number
PSP29A43042
Rev.
A
Date
15.01.2007
Lang.
en
Sheet
2/6 © ALSTOM 2012. All rights reserved..
1 PURPOSE
This instruction serve as a base to perform commissioning tests for HV surge arresters. All tests described herein must be performed in de-energised and groundedconfiguration only. The site specific safety regulations shall be followed by all means.
2 AREA OF APPLICATION
It covers the field testing of HV surge arresters at an HV switchyard or at a power plant.
3 REFERENCE DOCUMENTS
" HV surge arrester " manufacturer service manual.
" HV surge arrester" test certificate.
Plant specific single line / protection single line diagram.
Equipment specific diagram.
4 TERMINOLOGY – DEFINITION – ABBREVIATIONS
HV: High Voltage.
LV: Low Voltage.
Ur: Rated Voltage.
Ir: Rated Current.
8/11/2019 AMA00E TP001 RA Site Commissioning Procedure for Electrical Systems
http://slidepdf.com/reader/full/ama00e-tp001-ra-site-commissioning-procedure-for-electrical-systems 46/49
Legal Owner
ALSTOM PT-PE / Plants Business
Identification number
PSP29A43042
Rev.
A
Date
15.01.2007
Lang.
en
Sheet
3/6 © ALSTOM 2012. All rights reserved..
5 LIST OF COMMISSIONING EQUIPMENTS
The following is a list of the main equipment necessary in order to carry out all the
testing of the equipment covered by this procedure.
Not applicable
8/11/2019 AMA00E TP001 RA Site Commissioning Procedure for Electrical Systems
http://slidepdf.com/reader/full/ama00e-tp001-ra-site-commissioning-procedure-for-electrical-systems 47/49
8/11/2019 AMA00E TP001 RA Site Commissioning Procedure for Electrical Systems
http://slidepdf.com/reader/full/ama00e-tp001-ra-site-commissioning-procedure-for-electrical-systems 48/49
8/11/2019 AMA00E TP001 RA Site Commissioning Procedure for Electrical Systems
http://slidepdf.com/reader/full/ama00e-tp001-ra-site-commissioning-procedure-for-electrical-systems 49/49
9 COMMISSIONING
The following section describes all steps to be followed in order to commission in properand methodical manner the HV surge arresters.
9.1 BEFORE THE ENERGISATION
Ensure that all equipments have been restored to suitable state and ensure thatdocumentation due for permanent energisation of equipments & devices within each HVsurge arrester, as per site management rules, is available and signed by all relevantparties.
9.2 AFTER THE ENERGISATION
Just inspect visually.
9.3 RECORDS
All test records shall be filed in accordance with the Site Quality Plan.