ELECTRICAL ITEMS Annex-'A'

Page 1 of 2

ELECTRICAL ITEMS Annex-‘A’

Sr.

No.

Description of Material Standardization

A Lighting Material

i. Lighting Fixtures

ii. Lamps (HPSV, HPMV, MH, CFL,

Tube light etc.)

lamp Cap, Glass shape, rated power, Voltage, frequency, Initial

lumen flux. (As per attachment) 240V, 50Hz, Lamp Type Rated Power of Lamp

(Watt) Initial Luminous Flux (Lumens)

50 watt 4000 Lumen 70 6500 100 10000 150 17000 250 33000 400 55000

IS 10322 Part-5 (2012)

To be purchased as per IS

specification

iii. Ballast, Ignitors, Capacitors etc. To be purchased as per IS

specification

iv. LEDs

LED Street lights / industrial

lights:-

1. System Lumens:- 100

Lumen / Watt with LM79

certificate from NABL

accredited Lab (at 230 V

AC).

2. LED Make:- Lumiled ,

Nischia, Citizen, Cree with

minimum 130 Lumen /

Watt output with letter of

association along with LM-

80 report (for LED source


specification

Page 2 of 2

life from source

manufacturer).

3. Enclosure:- IP -20 for

indoor lighting and IP-65

for outdoor lighting

4. PF > 0.9

5. THD ≤ 10%

6. Driver:- integral type,

isolated type multistage

with constant current,

constant voltage with

SELV (Safety Extra Low

Voltage < 60 Volt DC)

having minimum 3-4KV of

surge protection.

7. IS Standard:- 16106 :

2012 and 16108 : 2012

Operating Voltage:- 95V

to 295 V , 50 Hz

G/W: 2 years.

v. Switches & Sockets

Current rating: 5/ 6/ 15 /16 Amp.


specification

vi. MCB,s

Current rating: 2Amp to 63 Amp

1/2/3/4 poles.

Breaking capacity: 10KA (

Icu=Ics)

Curve: B/C/D as per requirement


specification

Additional data/Special instructions if any: As per User requirement

ELECTRICAL ITEMS Annexure-B.

Standardized Specifications of 220 kV Current Transformers

220 kV switchyards at HPGCL can be categorized as under:

1. 220 kV Switchyard at DCRTPP, Yamunanagar.

2. 220 kV Switchyard Unit 7 & 8 at PTPS, Panipat.

3. 220 kV Switchyard Unit 5 & 6 at PTPS, Panipat.

All these switchyards are having current transformers with different Current Ratio. As

such these CTs are not interchangeable among different switchyards.

However, in case of DCRTPP all the CTs become interchangeable if metering core of the

CTs is standardized at an accuracy class of 0.2.

Details of CTs installed in different Switchyards is attached herewith as under:

1. 220 kV Switchyard at DCRTPP, Yamunanagar. (Annexure-I)

2. 220 kV Switchyard Unit 7 & 8 at PTPS, Panipat. (Annexure-II)

3. 220 kV Switchyard Unit 5 & 6 at PTPS, Panipat. (Annexure-III)

Thus Specifications of these CTs other than particulars of secondary winding can be

brought to a common bench mark, which is given as under:

Sl. no.

DESCRIPTION SPECIFICATIONS

1. Reference Standard IS 2705-1992

2. Type Outdoor, Single Phase, Oil filled & Dead Tank Type 3. Rated Voltage 220 kV 4. Highest System Voltage 245kV

6. Rated Secondary Current 1 Amp (for each core) 8. Rated Frequency 50Hz

9. Class of Winding Insulation “A”

10. Rated Continuous Thermal Current 120 % of rated primary Amps 11. Maximum Through Fault Current

Permissible 40 kA for 1 Second

12. Rated Dynamic Current 100 kA (peak) 13. One Minute Power Frequency Dry

Withstand Test Voltage 460 kV rms

14. One Minute Power Frequency Wet Withstand Test Voltage

460 kV rms

15. Impulse Withstand Voltage with 1.2x50 micro second full wave

1050 kVp

16. One Minute Power Frequency Withstand Test Voltage on Secondary

3 kV rms

17. Total Creepage for Porcelain Housing 7595 mm (31mm/kV for Highest System Voltage)

18. Transformer Oil EHV Grade As per IS:335

TECHNICAL SPECIFICATION FOR 220 kV CURRENT TRANSFORMERS (Annexure-B-I) DCRTPP, Yamunanagar.

Sl. no.

DESCRIPTION CT for Generator Transformer Bay CT for Station Transformer Bay CT for Bus Coupler Bay CT for Out Going Feeder Bay

1. Reference Standard IS 2705-1992 IS 2705-1992 IS 2705-1992 IS 2705-1992 2. Type Outdoor, Single Phase, Oil filled, Live

Tank Outdoor, Single Phase, Oil filled, Live



Tank

3. Rated Voltage 220 kV 220 kV 220 kV 220 kV

4. Highest System Voltage 245kV 245kV 245kV 245kV 6. Rated Secondary Current 1 Amp (for each core) 1 Amp (for each core) 1 Amp (for each core) 1 Amp (for each core)

8. Rated Frequency 50Hz 50Hz 50Hz 50Hz 9. Class of Winding Insulation “A” “A” “A” “A”

10. Rated Continuous Thermal Current ---- ---- ---- ---- 11. Maximum Through Fault Current

Permissible 40 kA for 1 Second 40 kA for 1 Second 40 kA for 1 Second 40 kA for 1 Second

12. Rated Dynamic Current 100 kA (Peak) 100 kA (Peak) 100 kA (Peak) 100 kA (Peak) 13. One Minute Power Frequency Dry

Withstand Test Voltage 460 kV rms 460 kV rms 460 kV rms 460 kV rms


460 kV rms 460 kV rms 460 kV rms 460 kV rms


1050 kVp 1050 kVp 1050 kVp 1050 kVp



17. Total Creepage for Porcelain Housing 25mm/kV 25mm/kV 25mm/kV 25mm/kV

18. Transformer Oil IS:335 IS:335 IS:335 IS:335 19. Detail of CORES I II III IV V I II III IV V I II III IV V I II III IV V

a. Current Ratio 2000 – 1000 /1A 2000/1A 2000 – 1000 - 500 /1A 2000/1A 2000 – 1000 /1A 2000/1A 2000 – 1000 - 500 /1A 2000/1A

b. Rated Burden -- 50-25 50-25 50-25 --- -- 50-25-12.5

50-25-12.5

50-25-12.5

--- -- 50-25 50-25 50-25 --- -- 50-25-12.5

50-25-12.5

50-25-12.5

---

c. Class of Accuracy PS 5P 0.5 0.5 PS PS 5P 0.5 0.5 PS PS 5P 0.5 0.5 PS PS 5P 0.2 0.2 PS

d. Pupose of Application Protn. Protn. Main

Metering Check

Metering Diff.

Protn. Protn. Protn.

Main Metering

Check Metering

Diff. Protn.

Protn. Protn. Main

Metering Check

Metering Diff.

Protn. Protn. Protn.

Main Metering

Check Metering

Diff. Protn.

e. ISF/ALF -- 20 < 5 < 5 -- -- 20 < 5 < 5 -- -- 20 < 5 < 5 -- -- 20 < 5 < 5 --

f. Minimum Knee Point Voltage (V) 2000 -

1000 --- --- --- 2000

2000 -1000 -

500

--- --- --- 2000 2000 -

1000 --- --- --- 2000

2000 -1000 -

500

--- --- --- 2000

g. Maximum Secondary Resistance (Ω) 8 - 4 --- --- --- 8 8 – 4

– 2.5 --- --- --- 8 8 - 4 --- --- --- 8

8 – 4

– 2.5 --- --- --- 8

h. Max. Iex at Vk (mA) 30 - 60

--- --- --- 30 30 – 60 -

120

--- --- --- 30 30 - 60

--- --- --- 30 30 – 60 -

120

--- --- --- 30

These three type of CTs are INTERCHANGEABLE as 500/1A tapping is not being used Accuracy class of Metering Core is 0.2

TECHNICAL SPECIFICATION FOR 220 kV CURRENT TRANSFORMERS (Annexure-B-II) SWITCHYARD-2 (Unit 7&8), PTPS.

Sl. no.

DESCRIPTION CT for Generator Transformer Bay/ Out Going Feeder Bay

CT for Station Transformer Bay CT for Bus Coupler Bay

1. Reference Standard IS 2705-1992 IS:2705 IS:2705 2. Type Outdoor, Single Phase, Oil filled & Dead Tank

Type Outdoor, Single Phase, Oil filled & Dead

Tank Type Outdoor, Single Phase, Oil filled & Dead

Tank Type 3. Rated Voltage 220 kV 220kV 220kV 4. Highest System Voltage 245kV 245kV 245kV

6. Rated Secondary Current 1 Amp (for each core) 1Amp(four each core) 1Amp(four each core) 8. Rated Frequency 50Hz 50Hz 50Hz

9. Class of Winding Insulation “A” “A” “A” 10. Rated Continuous Thermal Current --- --- ---

11. Maximum Through Fault Current Permissible

40 kA for 1 Second 40 kA four 1 sec. 40 kA four 1 sec.

12. Rated Dynamic Current --- --- ---

13. One Minute Power Frequency Dry Withstand Test Voltage

460 kV rms 460kV rms 460 kV rms




1050 kVp 1050 kVp 1050 kVp



17. Total Creepage for Porcelain Housing 7595 mm (31mm/kV for Highest System Voltage)

7595 mm (31mm/kV for Highest System Voltage)


18. Transformer Oil EHV Grade As per IS:335 EHV Grade As per IS:335 EHV Grade As per IS:335

19. Detail of CORES I II III IV V I II III IV V I II III IV V

a. Current Ratio 400/800/1200/1A 1000/2000/1A 150/300/1A 1000/2000/1A 500/1000/2000/1A 1000/2000/1A

b. Rated Burden - - 10 - - - 15 10 - - - 30 10 - -

c. Class of Accuracy PS PS 0.2 PS PS PS PS 0.2 PS PS PS 5P20 0.5 PS PS

d. Pupose of Application Protn. Protn. Metering Protn. Protn. Protn. Protn. Metering Protn. Protn. Protn. Protn. Metering Protn. Protn.

e. ISF/ALF -- -- ≤5 -- -- -- -- ≤5 -- -- ≤5

f. Minimum Knee Point Voltage (V) 237/475/

712

237/475/

712 -

500V/

1000V

500V/

1000V 370/740 - -

700/

1400

700/

1400

375/750/

1500 - -

500/

1000

500/

1000

g. Maximum Secondary Resistance (Ω) 1.75 /3.5 /5.25

1.75 /3.5 /5.25

- 5.0/10.0 5.0/10.0 1.75 /3.5

- - 10.0/ 20.0

10.0/ 20.0

2.5 /5.0 /10

- - 5.0/ 10.0

5.0/ 10.0

h. Max. Iex at Vk (mA) 60/30/20 60/30/20 - 30/15 30/15 30/30 - - 30/

30

30/

30 30/30/30 - - 30/30 30/30

None of these three type of CTs are Interchangeable

TECHNICAL SPECIFICATION FOR 220 kV CURRENT TRANSFORMERS (Annexure-B-III) SWITCHYARD-2 (Unit 5&6)

Sl. no.

DESCRIPTION CT for Generator Transformer & Out Going Feeder Bay

CT for Station Transformer Bay CT for Bus Coupler Bay CT for Bus Sectionaliser Bay

1. Reference Standard IS 2705-1992 IS 2705-1992 IS 2705-1992 IS 2705-1992

2. Type Outdoor, Single Phase, Oil filled & Dead Tank Type

Outdoor, Single Phase, Oil filled & Dead Tank Type Outdoor, Single Phase, Oil filled & Dead Tank Type

Outdoor, Single Phase, Oil filled & Dead Tank Type

3. Rated Voltage 220 kV 220 kV 220 kV 220 kV

4. Highest System Voltage 245kV 245kV 245kV 245kV 6. Rated Secondary

Current 1 Amp (for each core) 1 Amp (for each core) 1 Amp (for each core) 1 Amp (for each core)

8. Rated Frequency 50Hz 50Hz 50Hz 50Hz 9. Class of Winding

Insulation “A” “A” “A” “A”

10. Rated Continuous Thermal Current

120 % of rated primary Amps 120 % of rated primary Amps 120 % of rated primary Amps 120 % of rated primary Amps

11. Maximum Through Fault Current Permissible

40kA for 1 Second 40kA for 1 Second 40kA for 1 Second 40kA for 1 Second

12. Rated Dynamic Current 100kAP 100kAP 100kAP 100kAP

13. One Minute Power Frequency Dry

Withstand Test Voltage


14. One Minute Power

Frequency Wet Withstand Test Voltage


15. Impulse Withstand

Voltage with 1.2x50 micro second full wave

1050 kVp 1050 kVp 1050 kVp 1050 kVp

16. One Minute Power

Frequency Withstand Test Voltage on

Secondary


17. Total Creepage for Porcelain Housing

7595 mm (31mm/kV for Highest System Voltage) 7595 mm (31mm/kV for Highest System Voltage) 7595 mm (31mm/kV for Highest System Voltage)


18. Transformer Oil EHV Grade As per IS:335 EHV Grade As per IS:335 EHV Grade As per IS:335 EHV Grade As per IS:335

19. Detail of CORES I II III IV V I II III IV V I II I II I II III IV V Vi

a. Current Ratio 400/800/1200/1A 400/800/1200/12001A 150/300/6001A 400/800/1200/1A 400/800/1200 800/1200/1A 1000/200/1

b. Rated Burden - 30 45 - - - 30 30 - - 30 - 30 30 30 - - -

c. Class of Accuracy PS 5P20 0.5 PS PS PS 5P20 0.5 PS PS 5P20 PS 0.5 PS 0.2 5P20 PS PS PS

d. Pupose of Application Protn. Protn.

Meteri

ng Protn. Protn. Protn. Protn. Metering Protn. Protn.

PROTN Protn meterin

g

Protcn Mete

ring Metering Protn. Protn. Protn.

Protn.

e. ISF/ALF -- -- ≤5 -- -- -- -- ≤5 -- -- - - ≤5 - ≤5

f. Minimum Knee Point

Voltage (V) 15001500

/2250 - -

533V/533/80

0/1600V

533V/533/

800/1600V

600/1000/

2000 - -

267/535/

800

267/535/

800

- 267/

535/ 800

267/535/8

00 - - 800/1200 800/1200 800/1600 800/1600

g. Maximum Secondary Resistance (Ω) 5 /5 /10 - - 5.0/5/8/15

5.0/10.

5.0/5/8/15 1.5 /3/6 - - 3/6/10 3/6/10

- 3/6/10 - - - - 10/15 15/10 10/20

10/20

h. Max. Iex at Vk (mA) 30/30/30 ma at

25% Vk

- - 35 /35 /25/

25ma at 50%

Vk

35 /35/25/ 25ma at 50%

Vk 50% Vk

30 ma at 50 % /30/30 ma

at 25 % Vk

- - 70/35/25 ma at 50

% Vk

30/30 ma

at 25 % Vk

- 70/35/25 ma at 50

% Vk

- - 30/3

0/30 -

30 ma at

50 % Vk

30 ma at

50 % Vk

30 ma at

50 % Vk

30 ma at 50 % Vk

Annexure-B.-IV

Testing standards

Following tests are to be carried out on 220 kV CTs:

1. Ratio Tests on all the cores for all the tapings.

2. Measuring of Excitation Current on all the cores for all the tapings.

3. Measuring the Secondary Resistance for all the cores for all the tapings.

4. I.S.F. Test on Metering Core.

5. Tan Delta & Capacitance test.

6. High Voltage Power Frequency Test on Primary winding at 460 kV for one minute.

7. High Voltage Power Frequency Test on Secondary winding at 5 kV for one minute.

8. Partial Discharge Test at 156 kV.

9. Polarity Test.

ELECTRICAL ITEMS Annexure-C.

Standardized Technical Specifications for 245 kV Capacitor Voltage Transformers

Sl.

No.

Particulars Description

1. Standards applicable IS: 3156 (1992 Reaffirmed 2002)

Type Line to Ground, Outdoor, Oil filled,

Dead Tank.

2. Rated frequency (Hz) 50

3. Rated voltage factor 1.2 continuous/1.5 for 30 sec.

4. Rated primary Voltage (kV) 220/√3 kV

5. Highest System Voltage 245 kV rms (line to line)

6. Voltage Ratio V/V 220000/√3 / 110/√3 /110/√3 /110/√3

7. Accuracy class Core I-3P, Core II-3P, Core III-0.2

8. VA Burden Core I-100, Core II-100, Core III-100

9. Rated Thermal Burden 400 VA

10. Rated Capacitance 6600pF (+10%, -10%)

11. Capacitance of High Voltage

Capacitor 7325 pF Nominal

12. Capacitance of Intermediate Voltage

Capacitor 66680 pF Nominal

13. Capacitance for Carrier frequency

Coupling 6600 pF (+10%, -10%)

14. Natural Frequency of Coupling <600 kHz

15. Band Width 40 kHz to 500 kHz

16. 1.2/50 microsecond impulse

withstand test voltage of capacitor

(kVp)

1050 kVp

17. One minute dry and wet power

frequency withstand voltage of

Capacitor

460 kV rms

18. Corona Extinction Voltage 156 kV

19. One minute power frequency

withstand voltage of Secondary

Winding

3 kV rms

20. One minute power frequency

withstand voltage of HF Terminal 4 kv rms

21. Total creepage distance (mm) 7595mm (31mm/kV)

22. Standard to which oil conforms

generally IS:335 (1993)

23. Class of Winding Insulation “A”

ELECTRICAL ITEMS Annexure-D.

Standardized Technical Specifications for 245 kV Electro Magnetic Voltage Transformers

Sl.

No.


1. Standards applicable IS 3156 (1992 Reaffirmed 2002)

2. Rated frequency (Hz) 50

3. Rated voltage factor 1.2 continuous/1.5 for 30 sec.

4. Rated primary Voltage (kV) 220/√3 kV

5. Highest System Voltage 245 kV rms (line to line)

6. Secondary Voltage 110/√3 V

7. Accuracy class Core I-3P, Core II-3P, Core III-0.2

8 VA Burdon Core I-100, Core II-100, Core III-100

9 1.2/50 microsecond impulse

withstand test voltage of capacitor

(kVp)

1050 kVp

10 One minute dry and wet power

frequency withstand voltage 460 kV rms

11 Total creepage distance (mm) 7595mm (31mm/kV)

12 Standard to which oil conforms

generally IS:335 (1993)

ELECTRICAL ITEMS Annexure-E.

Standardized Specifications of SERVICE TRANSFORMERS

I.) Service transformer Dry type:

1. Standard Applicable - IS: 4691/IS: 11171-1985 (as per

requirement)

2. Enclosure - IP 23 indoor type

3. Type - Dry Type

4. Rated Power - As per requirement

5. Cooling - Air natural (AN)

6. Insulation class - H with temperature rise limited to F

7. Voltage ratio: 6.6/0.433kV or as per requirement

8. Insulation level:

a) HV - 7.2/20/60KV peak

b) LV - 3KV rms

9. Vector group -DYN 11

10. Type of Connection - Delta/ Star

11. No of phase - 3

12. Impedance - 4% to 10% depending upon the

rating/requirement of the transformers

13. Frequency - 50 Hz

14. Tapping on HV - +_ 2.5% to +_ 5% as per requirement

15. Ambient Temp. / rise over ambient - 50 deg. / 90 deg.

16. Additional data/Special instructions if an: As per User

requirement

II.) Service transformer Oil type:

1. Standard Applicable - IS: 2026

2. Type – Oil filled Type

3. Rated Power - As per requirement

4. Cooling – Oil Natural Air natural (ONAN)

5. Voltage ratio: 6.6/0.433kV or as per requirement

6. Type of Connection - Delta/ Star or as per requirement

7. No of phase - 3

8. Impedance - 5% to 10% depending upon the

rating/requirement of the transformers

9. Frequency - 50 Hz

10 Additional data/Special instructions if an: As per User requirement

Page 1 of 5

ELECTRICAL ITEMS Annexure-F.

Standardized Specifications for Power Transformers (245 kV)

TECHNICALPARAMETERS

S.N. Technical Parameters

(a.) Rated output ______ MVA (3-Phase)

(b.) Cooling & Cooling Rating OFAF/ODAF

(c.) Type Two Winding

(d.) Voltage Ratio ____kV/____kV

(e.) Frequency 50 Hz

(f.) Service Outdoor

(g.) Duty Continuous

(h.) Over load capacity As per IEC60076-7

(i.) Maximum designAmbient 50°C temperature

(j.) Permissible Temperature rise over an ambient temp.of 50°C

(i) Winding 40°C (byresistancemethod)

(ii) Topoil 35°C (bythermometer)

(k.) Impedance at 75 deg.C

(i) On Principal Tap 14%(with+/-5%tolerance)

(ii) On Other Taps 12%to 15%withoutanyfurthertolerance

(l.) Short circuit withstand time 3 sec.

(m.) Noise Level As per NEMA TR- 1

Page 2 of 5

(n.)

Winding Details

S.No. Parameter Unit HV LV HVN

(i.) System Fault Level kA 40 - - (ii.) Lightning impulse withstand voltage kVp 950 95 95 (iii.) Chopped Wave lightning impulse

withstand voltage kVp 1050 105 -

(iv.) Switching Impulse withstand voltage kVp 850 - - (v.) One min power frequency withstand

voltage kVrms 395/38* 38 38

(vi.) Winding connection - Star Delta Solidly Grounded

(vii.) Insulation - Graded Uniform - * Incase of non-uniformly insulated.

(o.) Bushing Details

S.No. Parameter Unit HV LV HVN

(i.) Rated Voltage kV 245 36 36 (ii.) Rated Current A 1000 12500 1000 (iii.) Lightning impulse withstand voltage kVp 1050* 170 170 (iv.) Switching Impulse withstand voltage kVp 850 - - (v.) One min power frequency withstand

voltage kVrms 460 70 70

(vi.) Minimum total Creepage distance mm 6125 900 900 (vii.) Mounting - Tank

Cover TankCover

TankCover

*The bushing shall be suitable for chopped wave lightning impulse test on transformer at 1050 kVp.

(p)Tap changer Details

(i.) Tap ChangerType Off Circuit Tap Changer(OCTC)

(ii.) Tap range +5 % to -5% in steps of 2.5% on HV neutral side.

(q.)Termination Details

HV(phase) Twin Moose ACSR conductor with 450 mm sub-conductor spacing and horizontal/vertical takeoff.

HVN (Neutral) Copper Flat

LV(phase) Isolated Phase Bus duct.

(r.) Partial Discharge levels(HV)

Max.P.D.Level 500pC Max. allowed change in PD after voltage enhancement

100pC

Page 3 of 5

GENERAL STANDARDS All equipment provided under the specifications shall in general conform to the latest issue of the following Standadrds:

Indian Standard

Code

Title International & Internationally Recognised Standards

IS:2026 Power Transformers IEC:60076

IS:3639 Fittings & accessories for power transformers

Insulating oil for transformer & switchgear IEC:60296, BS:148

IS:2099 Bushing for alternating voltagesabove 1000V IEC:60137, BS:223

IS:2705 Current transformers IEC:60044-1

IS:325 Three phase induction motors IEC:60034

IS:3637 Gas operated relays

IS:10028 Code of practice for selection installation & maintenance of transformers

IS:4691 Degree of protection provided by enclosure for rotating electrical machinery

IS:13947 Degree of protection provided by enclosure for low voltage switchgear & control

IEC:60144

IS:5 Colours for ready mix paints

IS:1866 Code of practice for maintenance & Supervision of mineral insulating oil in equipment

IS:6272 Industrial cooling fans

IS:6600 Guide for Loading of oil immersed transformers IEC:60076-7

IS:3347 Specification for dimensions of porcelain bushing

High voltage test technique IEC:60060

Insulation co-ordination IEC:60071

NEMA standard publication for Power transformers NEMA-TR-1

IS:10597 Code of practice for selection, Installation operation &

maintenance of pumps for industrial applications

IS:9434 Guide for sampling & analysis of free

& dissolved gas & oil from oil filled electrical equipment

IEC:60567

IS:10593 Guide to the interpretation of Dissolved and free

gasses analysis

IEC : 60599

IS:12676 Dimensions for OIP insulated condenser bushings

Guidelines for conducting Design reviews for transformers

100MVA and 123 KV and above

Cigre SC 12

(workingGroup 12.22)

Ability to withstand S.C.Test (Guidelines for conducting the

Design review)

IEC-60076 Part-5

(Point A.3)

IS:3203 Code of practice for climatic proofing of Electrical equipment

Page 4 of 5

Routine Tests on Transformer 1 All routine test in accordance with IEC 60076 shall be carried out in all the transformers.

2 Measurement of Voltage Ratio (as per cl. No. 10.3 of IEC 60076-1) and magnetic balance test & magnetizing current.

3 Measurement of Vector group & polarity check.

4 Measurement of winding resistance on HV & LV on all the taps (as per cl. No. 10.2 of IEC

60076-1)

5 Measurement of no load current with 415 V, 50 Hz AC supply

6 Measurement of no load losses and current at 90%, 100% & 110% of rated voltage (as per cl. 10.5 of IEC 60076-1)

7 Load Loss & Short Circuit Impedance Measurement on principal & Extreme Taps

8 IR measurement (As per cl. no:- i, 10.1.3 of IEC 60076-1)

9 10 KV core isolation (between core-clamp, core-tank & clamp-tank)

10 Measurement of capacitance & tan delta (should not exceed 0.5% at 20 deg C, Ref Note-

III) to determine capacitance between winding & earth. (As per cl. no:- i, 10.1.3 of IEC

60076-1)

11 Dielectric tests shall be carried out as per IEC 60076-3.

12 Separate Source Voltage Withstand Test (Table-2, 4 & cl. 11 of IEC 60076-3)

13 Lightning impulse (Full & Chopped Wave) test on HV & LV winding (as per cl 14 of IEC 60076-3)

14 Switching impulse test (as per cl no 15 & Table 1, page 25 of IEC 60076- 3)

15 *

ACLD test as per cl. 12.4 of IEC 60076-3 (also refer Table given below)

16 Repeat no load current/loss measurement and IR after completion of all electrical test

17 Oil leakage test on completely assembled transformer along with unit coolers (as per cl 6.02.00 (a) (1) of this sub section)

18 Jacking test followed by D.P. test

19 Frequency Response Analysis test

20 Marshalling Box/Cable box: It shall not be possible to insert a thin sheet of paper under

gaskets and through enclosure joints.

21 **

Temp. rise test at a tap corresponding to maximum losses & at minimum 110 % of rated

current of corresponding tap. DGA shall be conducted on oil sample taken before &

immediately after temp. rise test. Gas analysis shall be as per IS: 9434 (based on IEC:

60567), results will be interpreted as per IEC 61181. Infra red thermography shall be done

during temp rise test. Result shall be recorded for future reference.

22 Measurement of power taken by the fans and oil pumps

23 ***

IR Measurement on wiring of Marshalling Box

Page 5 of 5

*For ACLD (Long Duration)TestU1&U2are as follows:-

U1=1.8Um/√3KV&U2=1.6Um/√3kV

Test ACLD

Max allowed change in PD after voltage enhancement 100pC

The background noise level shall not exceed 100pC.

**In case of GT temp rise test shall be treated as RoutineTest. *** During IR test, the temperature of any part of tank shall be limited to 85 deg C.

TypeTests 1

Short circuit test (Dynamic) as per IEC60076-5. Following shall also be conducted before

& after S.C. test: (1).DGA (2).FRA

Physical inspection of GT to be done before S.C. Test in presence of inspecting Officer

2 Measurement of harmonics of no load current (special test) (cl.10.6of60076-1)

3 Measurement of acoustic noise level as per NEMA TR-1(specialtest)

4 Determination of transient voltage transfer characteristics (specialtest)

5 Zero sequence impedance measurement NOTE:- i) All the type/ special tests & Temperature rise test shall be conducted after performing

Short CircuitTest. If Tank Vacuum & Pressure Test is to be carried out then it shall be

conducted before SC test.

ii) The power factors should not exceed 0.5% (at20oC). However in case of deviation

from limiting values the same shall be resolved in line with IEEE Std-62.

Annexure-G

ELECTRICAL ITEMS LT Cable Jointing Kit (Standardized Specifications)

Type Tapex / Heat Shrinkable/Gel based etc. (As per User requirement)

Voltage grade 1KV/1.1KV

Cable Size 10,25,35,50Sq.mm etc. (As per User requirement) Service Type Indoor / Outdoor (As per User requirement)

Cable Type Armoured PVC /XLPE, Copper / Aluminium etc.(As per User requirement)

No. of Core 3Core/4Core etc. (As per User requirement)

Type Tests As per IS-13573 with latest modifications Shelf life of components in the kit Unlimited

Impulse withstand As per IS 13573 joints classification. For cable size less than 50sqmm,it will be 8KV & for cable size more than 50sqmm,it will be 20KV

Range taking feature Mandatory

Time Required for energisation after completion of termination/joint.

Immediate.

Additional data/Special instructions if any

As per User requirement

Page 1 of 2

ELECTRICAL ITEMS Annexure-H.

Standardized Specifications of CABLES

HT Power Cable

1. Description: Unearthed , Multistranded, Semiconducting

screened, XLPE insulated, extruded type inner & outer

PVC sheathing, Armoured shielded, FRLS

2. Type of conductor: Al

3. Standard Applicable – IS: 7098 -1985 (Part-II) Amended

upto date

4. Voltage rating: 3.3/6.6/11kV-As per requirement

5. No. of cores: As per requirement .

6. Additional data/Special instructions if any: As per User requirement

LT Control Cable (24/110/220V AC/DC)

1. Description: Multistranded, PVC insulated & Sheathed,

Armoured shielded, FRLS

2. Type of conductor: Cu

3. Standard Applicable – IS: 1554 -1988 (Part-I) amended

upto date

4. Voltage rating: 1.1kV or as per requirement

5 No of cores: Multicore (As per requirement)

6 Additional data/Special instructions if any: As per User requirement

LT (415 V) Power Cable

1. Description: Multistranded, PVC/XLPE insulated (as per

requirement), extruded type PVC inner & outer sheathed,

Armourded shielded, FRLS LT cables

2. Type of conductor: Al/Cu (as per requirement)

3. Standard Applicable – IS: 1554 -1988 (Part-I) for PVC

insulated /7098 -1985 (Part-II) for XLPE insulated

(Amended up to date, as per requirement)

4. Voltage rating: 1.1 kV/ As per requirement

5. No of cores: As per requirement


VI) LT Trailing Cable

1. Description: Multistranded Flexible Trailing cable,

Ethylene Propylene Rubber (EPR) Type, FRLS

2. Type of conductor: Cu

3. Standard Applicable – IS 1026 : 1984 'Specification for

flexible trailing cable’ or IS: 14494.1998 amended up to

date

4. Voltage rating: 1.1 kV or as per requirement.

5. No of cores: Multicore (As per requirement)


Page 2 of 2

ELECTRICAL ITEMS Annexure-I

Lighting Transformer – Standardised Specifications

Item Specification Lighting Transformer

Rating:-100KVA Type of Installation: Indoor Voltage: Primary: 433Volt (3 phase 3 wire). Secondary: 433Volt (3 phase 4 wire) Cooling :AN Transformer inbuilt with MLDB.

Annexure-J

ELECTRICAL ITEMS

Standardized Specifications of Specifications for LT Motor (AC)

Type Squirrel Cage Capacity (in KW) 5, 15, 50,100KW etc. (As per User requirement)

RPM 970, 1440, 2920 etc. (As per User requirement)

Voltage 415V ±10% (Standard) Phase 3Phase

Frequency 50Hz ±5% (Standard)

Connection Υ or Δ (As per User requirement)

Frame Size 90L,90S, 100L etc. (As per User requirement) Power Factor 0.85,0.8,0.9 (optional)

Efficiency Type EF-1, EF-2, EF-3 (As per User requirement)

Duty S-1,S-2,S-3 (As per User requirement) Insulation Class Class-F,H (As per User requirement)

Standards Applicable IS-325

Tests As per IS-325,4029 Mounting Foot/Flange

Protection IP-55

Space Heater Y/N (As per User requirement) Enclosure TEFC

Additional data/Special instructions if any As per User requirement

ELECTRICAL ITEMS Annexure-K

Standardized Specifications of 220 kV Isolators

Sl. No.

Description Specifications

1. Reference Standard IS:9921 2. Nominal System Voltage 220 kV

3. Rated Voltage 245 kV

4. Rated Frequency 50 Hz 5. No. of Phases Three (3)

6. Type of Disconnector Center Break, Outdoor, Gang Operated 7. Installation Outdoor

8. Rated Normal Current 2000A (or as per requirement)

9. Rated Short Time Withstand Current 40 kA rms for 3 seconds 10. Rated Dynamic Withstand Current 100 kA

11. Rated Short Circuit Making Current 100 kA (peak)

12. Magnetising Current Interruption Capacity 0.7 Amp at 0.15 P.F. 13. Line Charging Current Interruption

Capacity

0.7 Amp at 0.15 P.F.

14. 1.2/50 micro-sec Lightening Impulse WithStand Voltage

a) Between Poles & Earth 1050 kV (peak)

b) Across Isolating Distance, One terminal subjected to Lightening Impulse (kVp) and opposite terminal subjected to Power Frequency (kV

rms) voltage (as per IS)

1200 kV (peak)

15. Rated One Minute Power Frequency

Withstand Voltage.

a) Across Isolating Distance 530 kV rms

b) To Earth & Between poles 460 kV rms 16. Minimum Creepage Distance of Support

& rotating insulator

6125 mm

17. Safe duration of Overload

a) 150% of Rated Current 05 Minute

b) 120% of Rated Current 30 minute 18. Temperature Rise As per relevant IS

19. Current Density of Current Carrying Parts Copper : 2.0 Amp/mm2

Aluminium : 1.0 Amp/mm2

ELECTRICAL ITEMS Annexure-M

Surge Counter - Standardized Specifications

Item Description Specifications

Surge Monitor for 400 KV Lighting

Arrestor

Type: Non reset, Cyclometric counter

Sensitivity of surge counter: 100A (8/20microsec wave)

Nominal discharge current: 20KA Max. current to be withstood by the surge monitor: 100KA

Counter operation: One count per surge

ELECTRICAL ITEMS Annexure-N.

Standardized Specifications of 220 kV CIRCUIT BREAKERS

Sl.

No.


1. Type SF6 Circuit Breaker, Outdoor.

2. Rated Voltage 245 kV

3. Normal Current 3150 A

4. Frequency 50 Hz

5. Power Frequency Withstand Voltage 460 kV rms

6. Lightening Impulse Withstand

Voltage

1050 kVp

7. Corona Extinction Voltage 156 kV rms

8. Creepage Distance 7595 mm (31mm/kV)

9. First Pole to Clear Factor 1.3

10. Short Time Withstand Current 40 kA

11. Duration of Short Circuit 3 s

12. Short Circuit Breaking current 40 kA

13. Short Circuit Making current 100 kAp

14. Out of phase Breaking Current 10 kA

15. Line Charging Breaking Current 125 A

16. Operating Sequence O – 0.3s – CO – 3min - CO

17. Reference Standard IEC 62271 - 100

18. Tripping Coil per Pole Two

19. Closing Coil Per Pole One

20. Reclosing 1 phase and 3 phase Auto Reclosing

Annexure-L

Standardised Specifications of LIGHTENING ARRESTER

Sl. No.


1 Type Metal Oxide Lightening Arrester Without Gap

2 Applicable Standards IS:3070 (Part-3); IEC60099-4

3 Rated Voltage 198 kV (rms)

4 Nominal Discharge Current (8/20µs

wave)

10 kA

5 Long Duration Discharge Class Discharge Class-3

6 Rated Frequency 50 Hz

7 Highest System Voltage 245 kV

8 Nominal System Voltage 220 kV

9 System Earthing Solidly Earthed System

10 One minute Power Frequency Withstand Voltage

460 kVrms

11 Lightening Impulse Withstand Voltage 1050 kVp

12 Pressure Relief Class Class’A’ 40kA

13 Creepage Distance 7595 mm min. (31mm/kV)

Additional data/Special instructions if any: As per User requirement

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ELECTRICAL ITEMS Annex-'A'

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