transformer metering yard erkdjhcbd& oh lines components

7/27/2019 Transformer Metering Yard erkdjhcbd& OH Lines Components

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TPS: ELE-QA- 00105 May 2010

Technical Purchase SpecificationTransformer/Metering Yard & OH Lines Components

Gamesa Wind Turbines Pvt Ltd

No.489, GNT Road, Thandal kazhani,

Vadagari Post,Chennai 600 052.

INDIA


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Document Type:

TPS - Technical Purchase Specification

Specification Number :

ELE-QA-001

Prepared By: Venkatesan Approved By: S.Subbian Approval Dt.: 05 May 10 Rev : 00 Rev Date : 05 May 10

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11/22/33 KV TRANSFORMER & METERING YARD

Components Used:

1. Double pole steel Structure

2. Horn Gap Fuse

3. Lightning Arrestor

4. Air Break Isolator

5. Stay Wire

6. Fencing

7. Yard Light

8. Earthing Electrode

9. '0'-Gauge Copper/Transformer HT bushing termination

10.CT/PT Metering Unit


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Specification of Components:

11 KV SYSTEMS

1. Double pole steel structurePlease refer the drawing:

2. Horn Gap FuseItem No.

Material 11 KV Horn Gap Fuse

Description

ReferenceStandard

IS 1818, IS 9385

Sr Parameters Values / Specification

1 Nominal System Voltage 11 KV

2 Highest System Voltage 12 KV

3 Frequency 50 Hz

4 No of Poles 3

5 Base Channel

ISMC 75X40 mm hotdip galvanized with two nos of 100x50x6

mm bridge channel of galvanized

6 Copper Parts Tinned

7 Insulator

Two nos of 11 KV post insulator per phase (Total 6 nos 11 KV

post insulator for 3-phase) with creepage distance of not less

than 25mm/KV


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8 Terminal Connector Suitable tinned copper pad for copper/ACSR Conductor

9 Arcing HornsCopper clad (or) brass with the size of not less than that 2

SWG

10 Fuse Length 205 mm (8 inch)

11 Between post in each phase 610 mm

12 Between Phase to Phase 915 mm

13Bolting of the post to the

live terminal305 mm

14Live Terminal to the bottomof the horn

254 mm

15Bottom of the horn to the

top of the horn457 mm

16

Angle of the horn rod oneither side of the each

phase30 Degree

17 Test to be Conducted All routine & type test as per IS 1818

Reputed Make

1) ADCO, Kolkata

2) LAMCO, Hyderabad3) ELPRO International

4) OBLUM, Hyderabad5) DANKE, Ahmedabad6) IPL Products, Chennai


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ELE-QA-001


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3. Lightning ArrestorItem No.

Material 11 KV Lightning Arrestor

DescriptionLighting arrestors shall be of structures mounted complete with allaccessories such as terminal connectors, earthing bolts suitable for 50x6

mm GI flat etc. shall confirm to IEC-99-4

ReferenceStandard

IS: 2165-1977, IEC-99-4




3 Frequency 50 Hz

4 Arrestor Rating 9 KV (rms)

5 Class Station

6 Type Gapless type

7 System Solidly earthed

8

Discharge Voltage KV

(Crest) [8 x 20 m secondscurrent wave]

5 kA

9Maximum continuousoperating Voltage (MCOB)

7.2 kV (rms)

10Steep front dischargevoltage

36 KV (Crest)


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11Mounting bracket &earthing terminal

Hot dip galvanized steel

12 Line Terminal AL Alloy

13Rated Lightning impulse

withstand voltage (Peak)75 KV

14

Rated Power frequencyshort duration withstand

voltage28 KV (rms)

15 Creepage Distance 25 mm/KV Min

16 Test to be Conducted All routine & type test as per IS:2165-1977, IEC-99-4

Reputed Make

1) LAMCO, Hyderabad

2) ELPRO International

3) OBLUM, Hyderabad

4) Alstom


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ELE-QA-001


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4. Air Break Isolator/AB SwitchItem No.

Material 11 KV Air Break Isolator

Description

Air break isolator shall be Double break center rotating horizontal

mounting, mechanically gang operated complete with all accessories such

as operating pipes, guides, supporting insulators, link work, lockingarrangement and bimetallic PG clamps etc shall confirm to IS 1818-1972

ReferenceStandard

IS 1818-1972




3 Current Rating 400 Amps without exceeding temperature limit

4 Frequency 50 Hz

5 No of Poles 3

6 Base Channel ISMC 75X40 mm Hot dip galvanized

7 Copper parts Tinned

8 InsulatorThree nos of 11 KV post Insulator per phase (Total 9 nos 11KV post insulator for 3-phase) with creepage distance of not

less than 25 mm/kV

9 Operating Pipe25 mm dia, Class-B, GI pipe, 3 mm thick shall confirm to IS1239 Part-I

10 PG clamp Bimetallic strip suitable for copper terminals

11 Contact pressure of switch 1/2 lb/Ampere

12 Arcing Horn Copper clad with the size of 2 SWG

13 Bearing Rotating parts shall be fitted with suitable bearing

14 Locking Arrangement Locking arrangement shall provided with duplicate keys


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15 Indication ON/OF indication at Operating Handle

16 Short circuit current 16 KA for 3 Seconds

17 Phase to phase clearance 915 mm

18Distance between non

rotating Insulator762 mm

19 Male ContactSilver coated live contact on tubular arm of adequate

strength

20 Female ContactSpring Loaded finger type silver coated contacts of copper

material

21

One-minute Power

frequency withstandvoltage to earth and

between poles

35 KV (rms)

22 Test to be conducted All routine & type test as per IS 1818-1972

Reputed Make

1) Sterling, Vadodara2) ELPRO International, Hyderabad

3) ADCO, Kolkata

5) PACTIL6) DANKE, Hyderabad7) IPL Products, Chennai


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ELE-QA-001


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5. Stay Wire

a) The stay wire shall be of 7/8 SWG stranded steel wire (7/4.1mm) and ultimate tensilestrength of the guy wire is 6400 Kg for a safety factor of 2.5. The permissible tension in one

guy is 2560 Kg.

b) Two C type guy insulator to be used & minimum failing load of 88 KN and to be located 3mtr away from ground level

c) The diameter of anchor rod & turn Buckle rod is 20 mm. The anchor rod length is 1800 mmwhile that of turnbuckle rod is 450 mm

d) GI thimble to be used with anchor rod

e) Inclination angle of stay wire is 30-40 degrees

6. Fencing

The height of the fencing shall be of 1.8 mtr. The fencing mesh shall be mesh 10 SWG GI, 50 mm x

50 mm GI Chain Link, 50x6 mm MS Angle, 35 x 6 mm MS Angle and 25 x 3 mm MS flat for fencing

fabrication.

7. Yard Lighting

a) The light fitting 40 watts, fluorescent light shall be provided of reputed make vizPhilips/Bajaj/Crompton Greaves etc.

b) 10 Amps Double pole Miniature Circuit Breaker of 9 KA Interruption Capacity and 4 wayterminal block.

8. Earthing Electrodes

Ref Standard: IS 3043

The earth electrode shall be of 40 mm dia, 10 mtrs long MS rod (Or) galvanized iron pipe 50.8 mm

diameter, 5.5 mm thickness, 10 mtrs long.

50x6 mm GI flat to be used for earth Connection and 2 Runs of 65x 8 mm GI flat to be used for

Transformer neutral earth connection

All earth pits are interconnected except LA earth

Depth of Bore: 10 mtr

Soil treatment: Bentonite Powder, Common salt, Charcoal etc mixed with clay or red soil tightly

packed with throughout the 150 mm (6 inches) bore Individual Earth Resistance is less than 8Ohms & combined earth resistance is less than 1Ohm.


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9. '0' Gauge Copper/Transformer HT busing Termination

One and Half inch Aluminum tubular bus shall be for bus bars at Breaker Yard and for 1650 KW

m/c transformer bushing to Circuit Breaker termination. The aforesaid aluminum tubular bus shall

meet the following requirements (Approved Makes INDAL/Hindalco/Balco/ALCAN)


1 Gauge 0

2 Nominal Diameter 8.23 mm

3 Area 52.19 Sqmm

4 Weight 472.90 Kg/Km

5 Current Carrying Capacity 150 Amps @ 27 degree and 203 Amps & 55.5 degree celcius


1 Outer Diameter 47.50 mm

2 Inner Diameter 40.25 mm

3 Thickness 3.625 mm

4 Area 0.8 Sq.inches

5 Weight 0.939 lb/ft

6 Momemt of Inertia 0.3099 in4

7 Section modulus 0.3262 in3

8 Radius of gyration 0.6226 inches

9 DC Resistance16.97 Micro-ohms per ft @ 20

degree celcius

10 Current carrying capacity 840 Amps


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10. CT/PT Metering Unit:

Item No.

Material11 KV CT/PT Combined Metering Unit/ Separate units (Dependingon EB)

Description

Outdoor Oil cooled Copper wound, Continuous duty, Combined current &potential transformer-50/5 A (Depending on no of machines connected),15 VA, Acc Class: 0.5 and 11KV/110 V, 100 VA accuracy class: 0.5

(Accuracy class depending on EB requirements). If Separate VT ratio shall

be (11/v3) kV/(110//v3) V.

ReferenceStandard IS 2705/1992, IS 3156/1992


22 KV SYSTEMS

1. Double pole steel structure

Reference Drawing: PRV/GAMESA/850KW/22KV/1002

2. Horn Gap Fuse

Item No.


Description

ReferenceStandard

IS 1818, IS 9385




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3 Frequency 50 Hz

4 No of Poles 3

5 Base ChannelISMC 75X40 mm hot dip galvanized with two no of 100x50x6mm bridge channel of galvanized



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7 InsulatorTwo nos of 22 KV post insulator per phase (Total 6 nos 22 KVpost insulator in 3-phase) with creepage distance of not lessthan 25mm/KV


9 Arcing HornsCopper clad (or) brass with the size of not less than that 2SWG

10 Fuse Length 255 mm (10 inch)




live terminal450 mm


254 mm

15Botton of the horn to thetop of the horn

610 mm

16

Angle of the horn rod oneither side of the each

phase

30 Degree


Reputed Make

1) ADCO, Kolkata


4) OBLUM, Hyderabad5) IPL Products, Chennai

6) DANKE, Hyderabad


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ELE-QA-001


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Item No.




ReferenceStandard

IS:2165-1977, IEC-99-4




3 Frequency 50 Hz


5 Class Station

6 Type Gapless type


8 9


(Crest) [8 x 20 m seconds

current wave] Maximumcontinuous operatingVoltage (MOCB)

10 kA 14.4 kV (rms)

10Steep front discharge

voltage72 KV (Crest)


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11Mounting bracket &earthing terminal

Hot dip galvanized steel


13Rated Lightning impulse

withstand voltage (Peak)125 KV

14Rated Power frequencyshort duration withstandvoltage

50 KV (rms)


16 Test to be Conducted All routine & type test as per IS:2165-1977, IEC-99-4

Reputed Make


3) OBLUM, Hyderabad

4) Alstom


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ELE-QA-001


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4. Air Break Isolator/AB Switch

Item No.


Description

Air break isolator shall be Double break center rotating horizontalmounting, mechanically hand operated complete with all accessories such

as operating pipes, guides, supporting insulators, link work, locking

arrangement and bimetallic PG clamps etc shall confirm to IS 1818-1972

ReferenceStandard

IS 1818-1972





4 Frequency 50 Hz

5 No of Poles 3

6 Base Channel ISMC 75X40 mm Hot dip galvanized


8 Insulator Three nos of 22 KV post Insulator per phase (Total 9 Nos of22 KV post insulator for 3-phase) with creepage distance ofnot less than 25 mm/kV

9 Operating Pipe25 mm dia, Class-B, GI pipe, 3 mm thick shall confirm to IS1239 Part-I

10 PG clamp Bimetallic strip suitable copper terminals


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rotating Insulator

800 mm


strength


material

21

One-minute Powerfrequency withstandvoltage to earth and

between poles

55 KV (rms)


Reputed Make

1) Sterling, Varodara

2) ELPRO International, Hyderabad

3) ADCO, Kolkata4) PACTIL

5) IPL Products, Chennai

6) DANKE, Ahmedabad


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5. Stay Wire:

a) The stay wire shall be of 7/8 SWG stranded steel wire (7/4.1mm) and ultimate tensilestrength of the guy wire is 6400 Kg for a safety factor of 2.5. The permissible tension in oneguy is 2560 Kg

b) Two C type guy insulator to be used & minimum failing load of 88 KN and to be located 3

mtr away from ground level




6. Fencing

The height of the fencing shall be of 1.8 mtr. The fencing mesh shall be mesh 10 SWG GI, 50

mm x 50 mm GI Chain Link, 50x6 mm MS Angle, 35 x 6 mm MS Angle and 25 x 3 mm MSflat for fencing fabrication.

7. Yard Lighting

a) The light fitting 40 watts, fluorescent light shall be provided of reputed make vizPhilips/Bajaj/Crompton Greaves etc.

b) 10 Amps Double pole Miniature Circuit Breaker of 9 KA Interruption Capacity and 4 wayterminal block.

8. Earthing Electrodes:


The earth electrode shall be of 40 mm dia, 10 mtrs long MS rod (Or) galvanized iron pipe 50.8

mm diameter, 5.5 mm thickness, 10 mtrs long.


transformer neutral earth connection.

All earth pits are interconnected except LA earth

Depth of Bore: 10 mtr


Packed with throughout the 150 mm bore

Individual Earth Resistance is less than 8 Ohms & combined earth resistance is less than 1Ohm.


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ELE-QA-001


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9. '0' Gauge Copper/Transformer HT busing Termination

One and Half inch Aluminum tubular bus shall be for bus bars at Breaker Yard and for 1650 KWm/c transformer bushing to Circuit Breaker termination. The aforesaid aluminum tubular bus shallmeet the following requirements (Approved Makes INDAL/Hindalco/Balco/ALCAN)


1 Gauge 0


3 Area 52.19 Sqmm









6 Moment of Inertia 0.3099 in4



9 DC Resistance 16.97 Micro-ohms per ft @ 20 degree celcius



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10. CT/PT Metering Unit

Item No.

Material22 KV CT/PT Combined Metering Unit/ Separate Units (Dependingon EB)

Description

Outdoor Oil cooled Copper wound, Continuous duty, Combined current &potential transformer-50/5 A (Depending on no of machines connected),

15 VA, Acc Class: 0.5 and 22KV/110 V, 100 VA accuracy class: 0.5

(Accuracy class depending on EB requirements) If Separate VT ratio shallbe (11/v3) kV/ (110//v3)V

ReferenceStandard

IS 2705/1992, IS 3156/1992


33 KV SYSTEMS

1. Double pole steel structure

Reference Drawing: PRV/GAMESA/850KW/33KV/1001

2. Horn Gap Fuse

Item No.


Description

ReferenceStandard

IS 1818, IS 9385


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3 Frequency 50 Hz

4 No of Poles 3

5 Base ChannelISMC 75X40 mm hot dip galvanized with two nos of

100x50x6 mm bridge channel of galvanized


7 InsulatorTwo nos of 33 kV post insulator per phase with creepage

distance of not less than 25mm/KV


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910

Arcing Horns Fuse LengthCopper clad (or) brass with the size of not less than that 2SWG 381 mm (15 inch)




live terminal610 mm


254 mm

15Botton of the horn to the

top of the horn765 mm

16Angle of the horn rod oneither side of the each

phase

30 Degree


Reputed Make

1) ADCO, Kolkata2) LAMCO, Hyderabad3) ELPRO International

4) OBLAM, Hyderabad5) IPL Products, Chennai

6) DANKE, Hyderabad


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Item No.




ReferenceStandard

IS:2165-1977, IEC-99-4




3 Frequency 50 Hz


5 Class Station

6 Type Gapless type


8


(Crest) [8 x 20 m secondscurrent wave]

10 kA


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9Maximum continuousoperating Voltage (MOCB)

24 kV (rms)

10Steep front dischargevoltage

90 KV (Crest)

11Mounting bracket &

earthing terminalHot dip galvanized steel


13Rated Lightning impulsewithstand voltage (Peak)

170 KV

14

Rated Power frequencyshort duration withstand

voltage70 KV (rms)


16Test to be ConductedReputed Make

All routine & type test as per IS:2165-1977, IEC-99-4


3) OBLAM, Hyderabad

4) Alstom


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4. Air Break Isolator/AB Switch

Item No.


Description

Air break isolator shall be Double break center rotating horizontalmounting, mechanically hand operated complete with all accessories such

as operating pipes, guides, supporting insulators, link work, lockingarrangement and bimetallic PG clamps etc shall confirm to IS 1818-1972

ReferenceStandard

IS 1818-1972





4 Frequency 50 Hz

5 No of Poles 3

6 Base Channel ISMC 75X40 mm Hot dip galvanised


8 InsulatorSix nos of 22 KV post Insulator per phase (Total 18 nos 22KV post insulator for 3-phase) with creepage distance of not

less than 25 mm/kV

9 Operating Pipe25 mm dia, Class-B, GI pipe, 3 mm thick shall confirm to IS

1239 Part-I

10 PG clamp Bimetallic strips for copper terminals


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rotating Insulator

800 mm


strength


material

21

One-minute Powerfrequency withstandvoltage to earth and

between poles

75 KV (rms)


Reputed Make

1) Sterling, Varodara

2) ELPRO International, Hyderabad

3) ADCO, Kolkata4) PACTIL

5) IPL Products, Chennai

6) DANKE, Hyderabad


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5) Stay Wire:

a) The stay wire shall be of 7/8 SWG stranded steel wire (7/4.1mm) and ultimate tensilestrength of the guy wire is 6400 Kg for a safety factor of 2.5. The permissible tension in one

guy is 2560 Kg






6) Fencing:The height of the fencing shall be of 1.8 mtr. The fencing mesh shall be mesh 10 SWG GI, 50 mm x

50 mm GI Chain Link, 50x6 mm MS Angle, 35 x 6 mm MS Angle and 25 x 3 mm MS flat for fencing

fabrication.

7) Yard Lighting:

a) The light fitting 40 watts, fluorescent light shall be provided of reputed make viz

Philips/Bajaj/Crompton Greaves etc.

b) 10 Amps Double pole Miniature Circuit Breaker of 9 KA Interruption Capacity and 4 way

terminal block.

8) Earthing Electrodes:


Reference Drawing:

The earth electrode shall be of 40 mm dia, 10 mtrs long MS rod (Or) galvanized iron pipe 50.8mm diameter, 5.5 mm thickness, 10 mtrs long.


transformer neutral earth connection.

All earthpits are interconnected except LA earth

Depth of Bore: 10-12 m


packed with throughout the 150 mm boreIndividual Earth Resistance is less than 8 Ohms & Combined earth resistance is less than 1Ohm


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ELE-QA-001


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9. '0' Gauge Copper/Transformer HT Bushing Termination

One and Half inch Aluminium tubular bus shall be for b us bars at Breaker Yard and for 1650 KWm/c transformer bushing to Circuit Breaker termination. The aforesaid aluminum tubular bus shallmeet the following requirements (Approved Makes INDAL/Hindalco/Balco/ALCAN).


1 Gauge 0


3 Area 52.19 Sqmm









7 Momemt of Inertia 0.3099 in4



10 DC Resistance 16.97 Micro-ohms per ft @ 20 degree celcius



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10. CT/PT Metering Unit

Item No.

Material33 KV CT/PT Combined Metering Unit/Separate Units (Dependingon EB)

Description

Out door Oil cooled Copper wound, Continuous duty, Combined current &potential transformer-50/5 A (Depending on no of machines connected) ,

15 VA, Acc Class: 0.5 and 33KV/110 V, 100 VA accuracy class: 0.5

(Accuracy class depending on EB requirements) If Separate VT ratio shallbe (11/v3) kV/ (110//v3)V

ReferenceStandard

IS 2705/1992, IS 3156/1992


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11/22/33 KV OVERHEAD LINES (INTERNAL+EXTERNAL)

Components used at 11/22/33 kV Internal & External Lines:

1) RSJ Joist Poles

2) Reinforced Cement Concrete Poles

3) Stay with Guy Insulators

4) Pin Insulators

5) Disc Insulators

6) Cross Arms

7) ACSR conductor

Standard Clearance :

11 kV 22 kV 33 kV

Phase to Phase 460 mm 610 mm 915 mm

Phase to Earth 305 mm 460 mm 610 mm

Ground Clearance:

Vertical Clearance to ground in Mtrs

11 kV 22 kV 33 kV

In rural areas and places inaccessible to Vehicular traffic 4.572 5.182 5.182

In Village, towns and city areas along street 5.79 5.79 5.79

In Village, towns and city area across street 6.096 6.096 6.096


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1) RSJ Joist Poles:

All poles must be painted with two coats of red oxide and one coat of aluminum paint before

erection and final coating can be done after erection. Total DFT must be 80 microns minimum.

Single Circuit Line:

a) 9.50 Mtr long, 175x87x8 mm RSJ Joist pole shall be used for internal lines

b) The base plate size 300x300x6 mm shall be welded to the bottom of the joist

c) The factor of safety for RSJ Joist pole is 2

Double Circuit Line:

a) 11 Mtr long, 200x100x8 mm RSJ Pole must be used

b) The base plate size 300x300x6 mm shall be welded to the bottom of the joistc) The factor of safety for RSJ Joist pole is 2

The span length of line = 45 mtr (Max)

Every fifth / seventh pole shall be cut point (provided with stay wires)

In case of angle of deviation, Single pole with necessary stay arrangements, coil earthing, polenumbering, anti climbing devices (If required by EB), danger board in every cut-points to be

provided

Every fifth pole for RSJ pole shall be earthed as mentioned below

Pole earthing shall be done with 8 SWG GI wires closely wound 115 turns of 50 mm dia. and

burried in the earth nearby pole concrete at the depth of 1.5 mtr from ground level. The Earthresistance shall be of less than 10 Ohm. If achieving more than 10 ohms, multiple earthing

arrangement shall be done till achieving of less than 10 Ohms.

2) Reinforced Cement Concrete Poles (RCC):

9.14 mtr, 256 Kg safe working load, concrete ratio shall be 1:1.5:3, factor of safety is 2.5

The metal cross arm and the insulator pins shall be bonded together and earthed at every pole.

Pole earthing shall be done with 8 SWG GI wires closely wound 115 turns of 50 mm dia. andburried in the earth nearby pole concrete at the depth of 1.5 mtr from ground level in every pole.

The Earth resistance shall be of less than 10 Ohm. If achieving more than 10 ohms, multiple

earthing arrangement shall be done till achieving of less than 10 Ohms.

3) Stay with Guy Insulator:

a) The stay wire shall be of 7/8 SWG stranded steel wire (7/4.1mm) and ultimate tensile

strength of the guy wire is 6400 Kg for a safety factor of 2.5. The permissible tension in oneguy is 2560 Kg



c) The diameter of anchor rod & turnbuckle rod is 20 mm. The anchor rod length is 1800 mm

while that of turnbuckle rod is 450 mm


Inclination angle of stay wire is 30-40 degrees


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4) Pin Insulators

Item No.

Material 11/22/33 KV Pin Insulators

ReferenceStandard

IS: 731 RA 2001, BS: 137, IEC: 383

Sr Standard Particulars 11kV 22kV 33kV

1 Highest System Voltage 12 KV 24 KV 36 KV

2 Creepage Distance minimum 280 mm 565 mm

580 mm for lowpolluted area but 685

mm Creepage to beused for highlypolluted site like

Gujarat, Rameswaram

3 Visible Discharge Voltage 9 KV 18 KV 27 KV

4 Mechanical failing load 10 KN 10 KN 10 KN

5Power Frequency withstand

voltage (Wet)35 KV 70 KV 80 KV

6Power Frequency withstand

voltage (Dry)60 KV 90 KV 95 KV

7Power Frequency Flashovervoltage (Wet)

40 KV 75 KV 85 KV

8Power Frequency Flashovervoltage (Dry)

65 KV 95 KV 100 KV

9Lighting impulse withstand

voltage

75 KV (Peak)160 KV

(Peak)

185 KV (Peak)

10Power frequency under oilPuncture voltage test

105 KV 170 KV 190 KV

Reputed Make1) Birla Ngk (Jayashree)2) WS3) BHEL


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5) Disc Insulators

a) B & S Type Disc Insulators:

Item No.

Material B & S Type Disc Insulators

ReferenceStandard

IS: 731 RA 2001, BS: 137, IEC: 383

Sr Standard Particulars B & S Type

1 Visible Discharge Voltage 9 KV

2 Porcelain Diameter 255 mm

3 Spacing 145 mm

4 Creepage Distance 292 mm

5 Electromechanical Strength 70 KN

6 Power Frequency withstand voltage (Wet) 35 KV

7 Power Frequency withstand voltage (Dry) 50 KV

8 Power Frequency Flashover voltage (Wet) 45 KV

9 Power Frequency Flashover voltage (Dry) 65 KV

10 Impulse Flashover Voltage (Positive) 110 KV (peak)

11 Impulse Flashover Voltage (Negative) 120 KV (Peak)

12 Impulse Withstand Voltage 105 KV (Peak)

13 Power frequency puncture voltage 105 KV

14 Net Weight (Approx.) 5.2 Kgs

15 Ball Socket Size 16 MmB

Reputed Make1) Birla Ngk (Jayashree)2) WS

3) BHEL


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b) T & C Type Disc Insulators

Item No.

Material T & C Type Disc Insulators

ReferenceStandard

IS: 731, BS: 137, IEC: 383

Note: Composite/Elastomeric type Disc insulator can be used (Depending on EB Acceptance)

Sr Standard Particulars T & C Type

1 Porcelain Dia 255 mm

2 Spacing 145 mm

3 Total Creepage Distance 292 mm

4 Combined Electro Mechanical Strength 90 KN

5 Power Frequency withstand voltage (Wet) 35 KV

6 Power Frequency withstand voltage (Dry) 50 KV

7 Power Frequency Flashover voltage (Wet) 45 KV

8 Power Frequency Flashover voltage (Dry) 65 KV

9 Impulse Flashover Voltage (Positive) 110 KV (peak)

10 Impulse Flashover Voltage (Negative) 120 KV (Peak)

11 Impulse Withstand Voltage 105 KV (Peak)

12 Power frequency puncture voltage 105 KV

13 Net Weight (approx.) 5.5 Kgs

Reputed Make 1) Birla Ngk (Jayashree)2) WS

3) BHEL


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6) Cross Arms:

All cross arms must be painted with two coat of red oxide and one coat of aluminum before fix into

the pole and final coating will be given to achieve 80 microns.

Line Voltage (KV)

Vertical Clearance

Bn. Top & Bottom Cond.

(in cm)

Size of V Cross-arm

11 76.25920 mm long

75 x 40 Channel

22 91.41070 mm long

75 x 40 Channel

33 121.91370 mm long

100x 50 mm Channel


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7) ACSR Conductors:

Reference Standard: IS 398 (Part-2) : 1996

All ACSR Conductor to be manufactured as per the above mentioned IS Standard

SL No SPECIFIC REQUIREMENTS CODE NAME OF CONDUCTOR

Rabbit Raccon Dog

1Calculated equivalent area of aluminum (Sq.mm)

52.21 77.83 103.6

2Calculated DC resistance @ 20 degree C(Ohm/Km)

0.54490 0.3656 0.2745

Approximate Current carrying capacity in Amps40 degree C ambient

a) 30 deg. C rise 148 197 2543

b) 50 deg. C rise 183 245 311

Stranding wire diameter

a) Aluminum (No/dia. mm) 6/3.335 6/4.09 6/4.724

b) Steel (No/dia. mm) 1/3.35 1/4.09 7/1.57

5 Conductor dia (mm) 61.7 91.97 118.50

Approximate weight (Kg/Km)

b) Total a) Aluminum 214 145 318 215 394 2886

c) Steel 69 103 106

7 Approximate ultimate strength (Kg) 1860 2746 3299

8 Calculated linear co-efficient per C x 106 18.99 18.99 19.53

9Calculated final module of elasticity(Kg/cm6x106)

0.809 0.809 0.735


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- 37 -

COYOTE CONDUCTOR SPECIFICATION

Reference Standard: IS 398 (Part-2) : 1996

SL. No Technical Particular Value

1 Nominal Aluminum Area (Sqmm) 130

2 Stranding & wire diameter aluminum+steel (Nos/mm) 26/2.54 + 7/1.191

3 Calculated DC resistance @ 20 degree C (Ohm/Km) 0.2246

4 Calculated AC resistance @ 65 degree C (Ohm/Km) 0.2663

5 Calculated AC resistance @ 75 degree C (O hm/Km) 0.2754

6 Current capacity @ 65 degree C (Amps) 292

7 Current capacity @ 65 degree C (Amps) 358

Important:

1. All component manufacturers' test certificate must be shown to Gamesaon request at site,

failing which will be treated as rejection of the components. But, all certificate copy must beforwarded to Gamesa along with invoice.

2. If sub contractor wish to use any other makes other than as specified above, details of makecan be forwarded to Gamesa QA for approval. Only after written approval from QA, thespecified make can be used.

3. Identification of earth pits, measured earth resistance value and date of measurement mustbe displayed on earth pits before commissioning of WTG.

4. All earth pit handle must be painted for corrosion protection with black paint.

5. Anticorrosive black paint must be applied on RSJ joist pole in DP for the height of 300mm

from coping.

6. Petroleum jelly must be applied on AB switch contact points for smooth operation.

7. ON / OFF indication must be marked on AB switch operating handle and lock arrangement

must be provided.

8. Earth pit connection diagram as constructed must be drawn on transformer plinth.

9. Transformer and CT/PT metering unit HT bushing must be covered with empire tape.Terminal connector supplied with transformer to be used for transformer HT

bushing to Zero copper termination.


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10. Fire buckets with canopy must be provided in the yard (Two numbers of fire buckets with dryriver sand with canopy).

11. Safety items like, first aid box (Redi medi make), fire extinguisher (CO2), rubber mat, earth

discharge rod and first aid chart must be provided at tower.

12. Precommissioning checks on transformer, power cables and earth resistance will be recordedin prescribed checklist given by Gamesa.

13. Two nos yard light to be provided for G58 transformer Yard

14. Yard drainage path to be provided by using PVC pipe during civil work of yard wall.

15. 40 mm gravel to be filled around the transformer plinth and cable area to be covered by riversand by using bricks arrangement as specified in the drawing.

16. DEHN GUARD Earthing should be connected with LA Earth. 6 mtr 1core x 10 Sq.mm supplied

with capacitor panel for DEHN GUARD earth connection.

17. Cable length from tower to transformer must be used as is (22 mtr for G58) and looping mustbe done outside and inside the transformer yard. 12 times x OD of the cable bending radius to

be maintained for circle loop.

18. 1 KV megger to be used for transformer LV-E insulation resistance testing and 2.5 KV megger

to be used for HV-LV & HV- E insulation resistance measurements. 5/10 KV megger to be

used for XLPE cable insulation resistance tests.

19. For Earth resistance measurement, 0-20/200 Ohms, 160 rpm, 3-Pole with selector switch

megger to be used.

20. 'I' Clamp-50 x65x6 mm angle, 50x6 clamps and 5/8'' GI nut and bolts to be used foroverhead lines.

The contractor should be well acquainted with IE Rules 1956, The Electricity Act 2003,Indian Telegraphic Act 1889, EB Rules, and CEIG rules and all the EB & CEIG

requirements must be fulfilled for installations.

Note: In case of doubt or clarification, contact [email protected] or

[email protected]

transformer metering yard erkdjhcbd& oh lines components

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