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Transformer bushings, type GOE and GOE(2)

Technical guide

1ZSE 2750-105 en, Rev. 5, 2005-04-15

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This Technical Guide has been produced to allow transformer manufacturers, and theirdesigners and engineers, access to all the technical information required to assist them intheir selection of the appropriate Transformer Bushing. The Guide should be used in

conjunction with the Selection Guideto allow the optimum selection to be made.

The technical information pertaining to bushings manufactured by ABB has been dividedinto separate documents, with one document for each type.

The information provided in this document is intended to be general and does not coverall possible applications. Any specific application not covered should be referred directlyto ABB, or its authorized representative.

ABB makes no warranty or representation and assumes no liability for the accuracy of theinformation in this document or for the use of such information. All information in thisdocument is subject to change without notice.

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Table of Contents

Design _______________________4GOE features _______________________ 5GOE(2) features _____________________ 5Shed form __________________________ 6

Testing _______________________6Test tap ____________________________ 7Test tap adapter______________________ 7

Common specifications __________7

GOE 250-210 to 450-400 ________8GOE 650-500 to 900-650 ________9

GOE 1050-750 to 1425-1050 _____10

GOE 1550-1050 to 1800-1300 ____12

GOE 2100-1425 to 2550-1600 ____14

Current capacity _______________15Short-time current ____________________ 15Overload capacity of bushings __________ 15

Connection details______________16Draw rod system _____________________ 16Draw lead system ____________________ 18Outer terminal _______________________ 19

End-shields ___________________20GOE features _______________________ 20GOE(2) features _____________________ 21

Ordering particulars ____________22

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DesignThe GOE bushing is available in two designs: GOE andGOE(2). The bushing is built up around a centre tube on

which the condenser body is wound. The condenserbody is wound from insulating paper of the same typeas is used for high-voltage cables. For bushings up to550 kV paper of full width is employed. Bushings forhigher voltages are wound from paper strips in a man-ner similar to that used for cables.

The foils are located so that the best possiblecombination of external flashover and internal puncturestrength is achieved.

The upper insulator, which is made in one piece withoutgaskets, the lower insulator and the mounting flange areheld between the end plates by the centre tube andsealing is accomplished by oil-resistant rubber gasketsin grooves.

For GOE 250 to 900 the top housing is equipped withtwo oil level gauges of prisma type. For GOE 1050 andlarger, the top housing is equipped with a magnetic oillevel indicator.

Extension for currenttransformers

The mounting flange is an aluminium alloy casting. Thegasket surface is machined flat. On the flange there is a

test tap. This tap is automatically earthed by a protectivecap when the tap is not connected to external test ormeasuring circuits. The mounting flange and the tophousing are protected by a two-component grey-bluepaint.

The mounting flange can be equipped with extensionson the oil side, providing space for current transformers.Extension lengths 300 and 600 mm are available asstandard, but other lengths can be quoted on request.

The rated current is defined according to IEC 60137. Itis valid only when the centre tube is used as conductor.

For draw lead applications the permissible current willbe lower.

Bushings GOE 450 and larger require a shield at the oilend. The purpose of this shield is to avoid excessiveelectrical stresses in the oil at the lower end plate and atthe connection between the insulated lead from thetransformer winding and the draw lead or other

Sealing plugTop end nut

Flexible connection

Condenser body

Transformer oil

Pre-stressed tubes

Porcelain insulator, air side

Oil level gauge

Top housing

Clamping ring

Mounting flange

Bottom end nut

Porcelain insulator, oil side

Fig. 1. Transformer bushings types GOE and GOE(2).

Extension for currenttransformers

Sealing plug

Top end nut

Set of springs

Condenser body

Transformer oil

Porcelain insulator,air side

Oil level gauge

Top housing

Cemented flange

Bottom end nut

Porcelain insulator,oil side

Mounting flange

goe_0028

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conductors in the bushing. The maximum stresses inthe oil at the surface of the shield insulation must be

limited to those values normal for insulated conductorsand similar components in the same transformer.

ABB manufactures shields of this type, which are quotedfor and delivered separately. The shields are made ofaluminium and are insulated with epoxy or a lining ofpressboard. The shield may be mounted on the lower endplate of the bushing, or on the bottom contact of the drawrod. Dimensions and recommendations, see pages 17,20 and 21.

It is of great importance that the shield is placed in theright position in order to protect the bottom end of the

bushing. Guidelines for positioning of the shield aregiven in Figs. 14 and 16. ABB can also provideassistance with field calculations to confirm theperformance of other shielding systems.

Quotations for modifications in design and additionalparts such as special terminal studs, shields, rod gaps,etc., as well as special tests, are given on request.

GOE features

A set of concentric tubes are prestressed and serve assprings which hold the main bushing components

together and provide adequate pressure on the gasketsin all expected temperature and load conditions.

The annular space formed between the tubes makes anefficient cooling duct for dissipation of the heat, thusimproving the current-carrying capacity and thermalstability of the bushing.

The bushing is designed to be mounted at an angle notexceeding 60 from the vertical. A higher inclination can

be obtained on request.

The top housing is made of aluminium and has expan-sion space for the oil, sufficient for temperaturevariations in the bushing between -40 and +80 C.Variations in the length of the centre tube and thehousing are compensated by a flexible connectioninside the top housing.

For GOE 1050 and larger, the upper insulator is faste-ned with an additional clamping ring to the mountingflange.

GOE(2) features

A set of springs in the top housing provides adequatepressure on all gaskets, independently of temperatureand load conditions.

The bushing is designed to be mounted at an angle notexceeding 30 from the vertical.

The top housing has expansion space for the oilsufficient for temperature variations in the bushingbetween-40 and +80 C. Variations in the lenght of thecentre tube are compensated by the flexible cover of thehousing.

For GOE(2) the upper insulator is cemented to a flangewhich is bolted to the mounting flange.

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Fig. 2. Shed form, GOE and GOE(2).

65

10

36

R8

10

R10

70

27.5R10

R8R5.5

18

18

R5.5

goe_0029

R10

R10

R8

18

R8

R4.5

18

R4.5

10

10

66

51

31

70

Shed form

The shed form for all GOE bushings is of the anti-fogtype with alternating long and short sheds.

GOE:For each pair of sheds the ratio between nominalcreepage distance and the axial length is 3.43 and theratio between protected and nominal creepage distanceis 0.40.

TestingDuring manufacture and on completion the bushing issubjected to a number of routine tests, according toIEC 60137 and IEEE bushing standards. A tightnesstest is carried out on the assembled bushing after thefinal drying and impregnation. The test is made at an oil

overpressure of 180 kPa (1.8 bar) for 12 hours atambient temperature. No sign of leakage is allowed.Each bushing is subjected to a final electrical routinetest. The test is made at room temperature with thelower end of the bushing submerged in oil. Capacitanceand tan are measured in steps up to the powerfrequency withstand voltage, which is maintained forone minute.

Capacitance and tan are also measured with decrea-sing voltage at the same voltage levels as before theone minute test. Measurements for detection of internalpartial discharge (PD measurements) are also made.These measurements are carried out at the same time,and at the same levels, as the tan test. It is alwaysdemonstrated that the PD value is below 5 pC at ratedvoltage (=3 times bushing service voltage).

Bushings with BIL level 850 kV are routine tested witha dry lightning impulse voltage withstand test, whentested according to IEC 60137.

Type tests have been carried out according toIEC 60137 and IEEE. Type test reports are available onrequest.

GOE(2):For each pair of sheds the ratio betweennominal creepage distance and the axial length is 3.94and the ratio between protected and nominal creepagedistance is 0.43.

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Common specifications

For conditions exceeding the standard specification above, please consult ABB.

1) IEC 60815 "Guide for the selection of insulators in respect of polluted conditions."

Application:

Classification:

Ambient temperature:

Altitude of site:

Level of rain and humidity:

Pollution level:

Immersion medium:

Oil level in transformer:

Max. pressure of surroundingmedium:

Markings:

Transformers

Oil impregnated paper, capacitance graded, outdoor immersed bushing

+40 C to -40 C, minimum value acc. to temperature class 2 of IEC 60137.

< 1 000 m

1-2 mm rain/min. horizontally and vertically, as per IEC 60060-1.

According to specified creepage distance and IEC 60815 1).

Transformer oil. Maximum daily mean temperature 90 C. Maximum temporary oil temperature 115 C.

Not lower than 30 mm from the bushing flange.

100 kPa over pressure.

Conforming to IEC/ IEEE

Test tap

All GOE bushings are equipped with a test tapconnected to the outer layer of the condenser body. Themax. test voltage of the tap is 20 kV, 50 Hz for oneminute. The routine test voltage is 20 kV. Max. servicevoltage is 6 kV.

In connection with an external capacitance the test tapcan be used as a voltage tap. The test tap hasdimensions according to IEEE Potential tap type A.

Fig. 4. Test tap adapter.

(Pg 16 acc. to DIN 40430)

Turnable in optional directionPr 22.5

goe_0019

Fig. 3. Test tap

Test tap adapter

For permanent connection of the test tap to measuringcircuits, a test tap adapter is required. Cataloguenumber 2769 522-C.

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GOE 250-210 to GOE 450-400Nominal voltages 52 kV to 170 kVLightning impulse 250 kV to 550 kV

Fig. 5.

300

6 mountingholes 20

30

M12

130

350

386

L1

L2

25115

224

350L3

L4

L5

Earthed layer

D1

TypeGOE

CatalogueNumber

250-210

450-400

380-300

LF 121 051

LF 121 052

LF 121 053

Insulatorcolour

Brown/Light grey

-A/-AA-B/-AB-C/-AC-D/-AD



RatedcurrentA

Flangeextension

Creepagedistancemm

3150315050005000

3150315050005000

3150315050005000

0.60.30.60.3

0.60.30.60.3

0.60.30.60.3

142540-"--"--"-

238065-"--"--"-

335590-"--"--"-

D1mm

L120mm

L225mm

L3mm

L4mm

L55mm

48483838

48483838

48483838

550-"--"--"-

825-"--"--"-

1120-"--"--"-

1060-"--"--"-

1335-"--"--"-

1630-"--"--"-

605305605305

605305605305

605305605305

670375670375

630320630320

725430725430

985685985685

985685985685

985685985685

200190245225

240230290270

275265330315

Masskg

Table 1. Dimensions GOE 250 - GOE 450

Rating plate data

TypeGOE

RatedvoltageU

m

kV, RMS

Phase-to-earthvoltageU

Y

kV, RMS

DrylightningimpulseLIkV, Peak

WetswitchingimpulseSIkV, Peak

Routine test1 min dry50 HzkV, RMS

250-210380-300450-400

52123170

5284123

250450550

210300400

120185260

Table 2. Electrical data GOE 250 - GOE 450

Other data for information

TypeGOE

Flangeextension

Wet powerfrequencyACkV, RMS

DryswitchingimpulsekV, Peak

Nom. cap.betweenconductor andtest tap (C1)C110% (pF)


250-210380-300450-400

0.6 / 0.30.6 / 0.30.6 / 0.3

120170240

400550650

810 / 594594 / 448543 / 423

TypeGOE

250-210380-300

450-400

Max. test load 1 minacc. to IEC 60137 (N)

Max. permitted load (N)in operation at mounting angle0 -30 -60

57005700

5000

28002800

2500

23002300

2000

17001700

1500

Table 4. Mechanical loading GOE 250 - GOE 450

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GOE 650-500 to GOE 900-650Nominal voltage 245 kVLightning impulse 650 kV to 950 kV

Fig. 6.

8 mountingholes 20

350M12

45

130

350

386

L1

L2

115

400

264

L3L4

Earthed layerL5

D1

25

TypeGOE

CatalogueNumber

650-500

900-650

LF 121 054

LF 121 055

Insulatorcolour

Brown/Light grey



RatedcurrentA

Flangeextension

Creepagedistancemm

3150315050005000

3150315050005000

0.60.30.60.3

0.60.30.60.3

4045105-"--"--"-

5735150-"--"--"-

D1mm

L1mm

L2mm

L3mm

L4mm

L55mm

48483838

48483838

130027-"--"--"-

605305605305

605305605305

615315615315

700400700400

11358351135835

11358351135835

340320400380

405390480455

Masskg

180037-"--"--"-

181033-"--"--"-

231042-"--"--"-

Table 5. Dimensions GOE 650 - GOE 900. (See also Technical Guide GOM, 1ZSE 2750-108.)

Rating plate data

TypeGOE

RatedvoltageU

m

kV, RMS


Y

kV, RMS



Routine test1 min dry50 HzkV, RMS

650-500900-650

245245

155170

650950

500650

325395



TypeGOE

Flangeextension





650-500

900-650

0.6 / 0.3

0.6 / 0.3

315

395

650

750

498 / 392

448 / 365

TypeGOE

650-500900-650



57005000

28002500

23002000

17001500


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GOE 1050-750 to GOE 1425-1050Nominal voltages 362 kV to 420 kVLightning impulse 1050 kV to 1425 kV

Type CatalogueNumber

GOE1050-750

GOE1300-1050

GOE1175-850

LF 121 063

LF 121 061

LF 121 071

Insulatorcolour

Brown/Light grey

-A/-AA-B/-AB-C/-AC

-A/-AA-B/-AB-C/-AC-D/-AD-E/-AE-F/-AF

-A/-AA-B/-AB

RatedcurrentA

Flangeextension

Creepagedistancemm

250025002500

250025002500500050005000

25002500

0.60.30

0.60.300.60.30

0.60.3

7205185-"--"-

7955205-"--"--"--"--"-

10290265-"-

D1mm

L1mm

L2mm

L3mm

L4mm

L55mm

484848

484848383838

4848

223055-"--"-

307060-"--"-

1005985

60530556053055

6053055

6103353561033535

13351035

65539090

620320

1335103573513351035735

13351035735

775755730

830810785935910875

605305

Masskg


GOE(2)1425-1050

247055-"--"--"--"--"-

331060-"--"--"--"--"-

LF 121 570

322554-"-

406559-"-

600300

-A/-AA-B/-AB

16001600

0.60.3

11750350-"-

5050

32504-"-

413610-"-

628328

13901090

770750

Rating plate data

Type RatedvoltageU

m

kV, RMS


Y

kV, RMS



GOE 1050-750GOE 1175-850GOE(2) 1175-850GOE 1300-1050GOE 1300-1150GOE(2) 1425-1050

362362362420420420

220220220245245243

105011751175142514251425

750850850105011751050

505530560630680690



Flangeextension



Nom. capacitancebetweenconductor andtest tap (C1)C110% (pF)

0.6 / 0.3 / 00.6 / 0.3 / 00.6 / 0.30.6 / 0.30.6 / 0.30.6 / 0.3

480540560650650690

9609501030105011751140

430 / 383 / 308490 / 420 / 345470 / 407575 / 560575 / 545532 / 474

Type

GOE 1050-750GOE 1175-850GOE(2) 1175-850GOE 1300-1050GOE 1300-1150GOE(2) 1425-1050



1300012000100001000090005000

650060005000500045002500

430043004400300025001600

310031001500


Routinetest1 min dry50 HzkV, RMS

GOE(2)1175-850

LF 121 560 -A/-AA-B/-AB

16001600

0.60.3

9150400-"-

5050

580565

1225925

635335

600300

25404-"-

342610-"-

GOE1300-1150

LF 121 071 605305

-C/-AC-D/-AD

25002500

0.60.3

11600300-"-

4848

362056-"-

446061-"-

620320

13351035

10551035

Type

GOE(2) 1175-850GOE(2) 1425-1050

D6 D7

450500

400450

Table 13. Dimensions GOE(2)

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Fig. 7a. Type GOE

8 mountingholes 20

430

45

M12

500

485

150

L1

L2

Earthedlayer

L3L4

L5

196

330

480

D1

28

Fig. 7b. Type GOE(2)

goe_0030

12 mountingholes 23

30 M12Test tap

Earthedlayer

450

382

158

L1

L2

L3L4

L5 D6

422

300

D1

25310

D7

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Type CatalogueNumber

GOE1550-1050

GOE1800-1300

GOE1675-1175

LF 121 072

LF 121 073

LF 121 074

Insulatorcolour

Brown/Light grey

-A/-AA-B/-AB-C/-AC

-A/-AA-B/-AB-C/-AC

RatedcurrentA

Flangeextension

Creepagedistancemm

250025002500

0.60.30

10130260-"--"-

L1mm

L2mm

L3mm

L4mm

L55mm

322554-"--"-

396559-"--"-

6053055

65535555

15851285985

145514201385

Masskg


250025002500

0.60.30

11700300-"--"-

372050-"--"-

446055-"--"-

6053055

15851285985

63033030

163516001565

GOE1675-1300

LF 121 073 -D/-AD-E/-AE-F/-AF

250025002500

0.60.30

13380330-"--"-

422050-"--"-

526055-"--"-

6053055

61031010

15851285985

178517501715

-A/-AA-B/-AB-C/-AC

250025002500

0.60.30

13380330-"--"-

422050-"--"-

526055-"--"-

6053055

61031010

15851285985

178517501715

550550550550550

318318318318318

15501675167516751800

10501300130013001300

750750750750800


0.6 / 0.3 / 00.6 / 0.3 / 00.6 / 0.3 / 00.6 / 0.30.6 / 0.3 / 0

660730790750800

10501300130014101300

457 / 390 / 342512 / 440 / 433500 / 490 / 450525 / 482500 / 490 / 450

GOE(2)1675-1300

LF 121 580 -A/-AA-B/-AB

16001600

0.60.3

15200350-"-

41604-"-

504610-"-

600300

639339

15851285

10551020

Rating plate data

Type Rated

voltageU

m

kV, RMS

Phase-

to-earthvoltageU

Y

kV, RMS

Dry

lightningimpulseLIkV, Peak

Wet

switchingimpulseSIkV, Peak


Flange

extension

Wet power

frequencyACkV, RMS

Dry

switchingimpulsekV, Peak

Nom. capacitance

betweenconductor andtest tap (C1)C110% (pF)

Routine

test1 min dry50 HzkV, RMS

GOE 1550-1050GOE 1675-1175GOE 1675-1300GOE(2) 1675-1300GOE 1800-1300

Type Max. test load 1 minacc. to IEC 60137 (N)


160001600013000500013000

80008000650025006500

47004700430014004300

2500250015001500


GOE 1550-1050GOE 1675-1175GOE 1675-1300GOE(2) 1675-1300GOE 1800-1300

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660

12 mountingholes 24

Position oftest tap

M12

30

600

565

150

48

Earthedlayer

L1L2

L3L4

L5720

428

28

196

Fig. 8a. Type GOE Fig. 8b. Type GOE(2)

450

12 mountingholes 23

Test tap M1230

Earthedlayer

goe_0031

450

382

158

L1

L2

50

L3L4

L5

300

462

25310

500

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Fig. 9.

711

30

M12

12 mountingholes 32

600

565

150

L1

L2

665

Earthedlayer 528

L3

L5

L4

216

48

28

780

Position oftest tap

TypeGOE

CatalogueNumber

2100-1425

2550-1550

LF 121 081

LF 121 082

Insulatorcolour

Brown/Light grey

-A/-AA-B/-AB

-A/-AA-B/-AB-C/-AC

RatedcurrentA

Flangeextension

Creepagedistancemm

25002500

0.60.3

16630420-"-

L1mm

L2mm

L3mm

L4mm

L55mm

522052-"-

626557-"-

605305

710410

19551655

26052555

Masskg


250025002500

0.60.30

18320460-"--"-

572052-"--"-

706557-"--"-

6053055

195516551355

64034040

276027102650

2550-1600 LF 121 083 250025002500

0.60.30

20000500-"--"-

621058-"--"-

755563-"--"-

6053055

64034040

195516551355

291528652805

-A/-AA-B/-AB-C/-AC

Rating plate data

TypeGOE

RatedvoltageU

m

kV, RMS


Y

kV, RMS



2100-14252550-15502550-1600

800800800

485485485

210025502550

142515501620

97010001000



TypeGOE

Flangeextension





2100-14252550-15502550-1600

0.6 / 0.30.6 / 0.3 / 00.6 / 0.3 / 0

9009501000

155016751760

600 / 575574 / 522 / 476600 / 550 / 506

TypeGOE

2100-1425



15700 7850 5400 3600


Routinetest1 min dry50 HzkV, RMS

2550-15502550-1600

1400013000

70006500

44003700

25001600

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Current capacityThe rated currents specified in this catalogue are basedon thermal tests and are in accordance with IEC 60137

and apply to the built-in conductors of the bushings. TheGOE bushings conform to the requirements of IEC60137 and IEEE for currents given in Table 25.

Short-time current

The rated thermal short-time current (Ith), as defined in

IEC 60137 clause 5, is listed in Table 25 for draw rodand fixed bottom end terminal.

For draw lead of stranded copper with the area100 mm2the short-time current (I

th) is 9.6 kA for

1 second and 6.8 kA for 2 seconds. For other areas the

short-time current is directly proportional to the area.The rated dynamic current (I

d) is 2.5 times the 1 second

short-time current.

Overload capacity of bushings

If the conductor for the bushing is selected with 120 %of the rated current of the transformer, the bushing isconsidered to be able to withstand overload conditionsaccording to IEC 60354 without further clarification ortests. This recommendation complies with IEC 60137.

RatedcurrentIECA

CurrentIEEEA

Short-time current Dynamic currentIth

1 skA

Ith

2 skA

Id

peakkA

Table 25. Rated current, short-time current and dynamiccurrent as defined in IEC 60137, for draw rod and fixedbottom end terminal.

160025003150

5000

145021002700

4250

100100100

100

75100100

100

250250250

250

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Connection detailsThe oil side connection can be made with either a draw-rod system or a draw-lead system. For the air side

connection the same outer terminals are provided forboth systems. When ordering, please specify the itemsstated below.

Type of draw rod GOE typeBIL

GOECat. No.

Lower draw rod1)

Upper draw rod1)

250-2550

250-2550

LF 170 059

LF 170 057

Table 21. Ordering particulars for draw rod system.1) Lower draw rod includes bottom contact, guiding cone and draw rod

up to bushing flange level.2) Upper draw rod includes the complete draw rod above mounting

flange level and the temperature compensation device.

GOE(2)Cat. No.

LF 170 098

LF 170 097

Draw rod systemFig. 10a: The centre tubeof the bushing is used ascurrent conductor.

Fig. 10a.

Fig. 10b: The transformerleads are fitted with cablelugs, which are bolted to abottom contact.

Fig. 10b.

Fig. 10c: This contact isdrawn against the lowerend of the bushing tube bya thin steel draw rod.

Fig. 10c.

During installation on thetransformer, the upper

end of this rod is bolted toa spring device beneaththe outer terminal, whichconsists of two concentrictubes of differentmaterials and is sodesigned that it gives therequired contact load at alltemperatures.

Fig. 10d.

Bottom contacts with 4 or 6 threaded holes for cable lugs

are available. The bottom contacts are made of copperand have rounded edges, so that they may be usedwithout any shield for low insulation levels.

At the level of the flange the draw rod is split into twoparts. If required to meet the transport conditions, wecan position a joint at any desired level below the flange.This must be stated in the order. The lower part withcontact end shield can then be secured to the coverduring transport and storage of the transformer. Thissystem has been supplied by ABB since the seventieswith an excellent service record and has the followingadvantages compared to other methods used for highcurrents:

No hand holes required in the transformer tank.

Easy bushing installation and removal no

connection work inside the transformer at site.

No special supports required in the transformer as is

the case with plug contacts.

Perfect guiding of the bushing into the transformer.

The lower end shield may be fixed to the contact and

will thus be correctly positioned with respect to thelower end plate of the bushing.

No mechanical forces exerted on the leads from the

transformer windings at any time.

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17

D2

150

Outerterminal

Threaded hole M8for pulling wire

M16

25

Additional jointon request

Mountingflange

125

5065

Large bottom contactSmall bottom contact

5839

L5

H2

L2

60

H1

240

Fig. 10e. Draw rod system. For all currents up to rated current of the bushing. Selection as per Table 21.

goe_0033

D2

125

Outerterminal

Threaded hole M8for pulling wire

H2

L2

Mountingflange

M1625

60

Additional jointon request

L5

H1

110

110

5165

N1=4

5165

Smallbottom contact

Largebottom contact

N1 = Number ofholes M12, equippedwith thread insertwith screw lock,depth 20, for cablelugs.

GOE GOE(2)

N1=4N1=6N1=4

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18

Fig. 11. Draw lead systems, LF 170 056 and LF 170 091. Selection as per Tables 22a and 22b.

D2

150

Outerterminal

H2 Threaded hole M8for pulling wire

350L2

End ofcable

D3

D9 goe_0034

125

Outerterminal

H2

Threaded hole M8

for pulling wire

53

L2End ofcable D3

46

D2GOE GOE(2)

D3mm

D9mm

Min. innerdiam. D1of bushingmm

Cond.areamm2

Current, A

IEC IEEE

Completeinner terminalCat. No.

Masskg

01)

15

30

3535

35

3838

38

-5095150285

-2053906151000

-200370540830

LF 170 056-A-B

-C

3.23.2

3.2

40

01)

45

45

48

48

450600-

13001600-

11001360-

-D

-E

4.4

4.4

1)With pilot hole D=5

Table 22a. Inner terminal type GOE.

Draw lead system

GOE

Suitable copper terminals for flexible draw leads areavailable for currents up to 1600 A. The terminal systemconsists of a two-part cable connector with a hole forbrazing of the cable or cables. The two parts arescrewed together in such a manner that normaltolerances in the cable and bushing lengths can becompensated. The connector is fastened by a hexagonnut to a copper plate placed at the top of the bushing.The GOE outer terminal stud is placed on top of thisplate.

GOE(2)The terminal system is made in one piece forconnection of a draw lead. The terminal is attached bymeans of a divided ring at the top of the centre tube.When mounting the outer terminal, the ring becomeslocked.

D3mm

Conductorareamm2

Current, A

IEC IEEE

Completeinner terminalCat. No.

Masskg

01)

153042

-95285740

-3006301300

-2605401110

LF 170 091-A-B-C-D

1.11.00.90.7

1)With pilot hole D=5

Table 22b. Inner terminal type GOE(2).

30

goe_0037

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19

Outer terminal

The outer terminal consists of a cylindrical stud. Themounting arrangements are the same for all GOEbushings, regardless of size, current rating and internalconnection system. Copper and aluminium studs areavailable.

The terminal stud assembly consists of a stud, aretainer ring, a gasket, bolts and washers. The electricalcontact function and the sealing function are completelyseparated.

The stud is first fastened to the bushing top with M10bolts, which give the proper electrical contact. Thecontact surface is located inside the gasket and is thuswell protected from corrosion. Finally, the retainer ringwith the gasket is pressed against the stud by means ofM8 bolts.

Material D2mm

H2mm

Max. ratedcurrent, A

Cat. No. Masskg

AlCuCu

606096

125125115

250040005000

LF 170 073 3811.6

-A-B

-AA

Table 23a. Outer terminal type GOE. Special outerterminals available on request.

Material D2mm

H2mm

Max. ratedcurrent, A

Cat. No. Masskg

Al

AlCuCu

30

603040

125

125125125

1250

160016001600

LF 170 090 1.0

1.82.83.4

-A

-B-C-D

Table 23b. Outer terminal type GOE(2). Special outerterminals available on request.

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End-shieldsTypes GOE

The maximum stresses in the oil at the surface of theshield insulation and the parts surrounding the bushingmust be limited to those values normal for insulatedconductors and other similar components in the sametransformer.

The withstand voltages in a specific case depend uponmany factors beyond the control of the bushing manu-

facturer. Therefore the configurations and distancesgiven below are only intended as guidelines.

ABB can also provide assistance with field calculationsto confirm the compatibility between the transformer andour bushings.

Fig. 13. Recommended minimum distance A fordifferent shields and test voltages.

(kV) U(kV) LI

10002500

5001500 20001000500

00

Shield -U/-UP

0

500

1000

Amm

U = Power frequencyLI = Lightning impulse

No shield

Fig. 14. Mounting alternatives.

Shield mounted onthe bushing

Shield mounted on the draw rod bottomcontact. (Not possible for small bottomcontact with N1 = 4. See page 17.)

Fig. 12. Recommendations for positioning.

D4D5

R2

R3H5

H4

H6R1

Earthed layer

45R

min5

Edges within this

area should berounded toR

min=5 mm

60

A

A = Distance to flat surface e.g. tank or core clamp

125102

60

60

20

13

18

Large bottom

contact N1= 6

Shield -X/-XPShield -V/-VP

ShieldTo be usedwith GOE

Dimensions according to Fig. 12 (mm)D4 D5 H4 H5 H6 R1 R2 R3

Masskg Cat. No.

Epoxyinsulated

Pressboardinsulated 1)

U 250-1300 262 265174 170 90 492 30 8 2.1 LF 170 046 -U -UP

VX

1550-18002100-2550

352420

365420

207230

240290

120125

351533

2444

1025

2.53.2

LF 170 046LF 170 046

-V-X

-VP-XP

Table 24. Insulated shield.

1) All dimensions refer to the epoxy insulated shield, which is used as a base. The thickness of the pressboard is 3 mm for -UP and -VP, and 5mm for -XP.

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21

Types GOE(2)

The maximum stresses in the oil at the surface of theshield insulation and the parts surrounding the bushingmust be limited to those values normal for insulatedconductors and other similar components in the sametransformer.

The withstand voltages in a specific case depend uponmany factors beyond the control of the bushing manu-

facturer. Therefore the configurations and distancesgiven below are only intended as guidelines.

ABB can also provide assistance with field calculationsto confirm the compatibility between the transformer andour bushings.

Fig. 16. Mounting alternatives.

Shieldmounted onthe bushing

Shield mounted on the draw rod bottomcontact. (Not possible for small bottomcontact. See page 17.)

Fig. 15. Recommendations for positioning.

Earthed layer

45Rmin

5

Edges within this

area should berounded toR

min=5 mm

60

A

A = Distance to flat surface e.g. tank or core clamp

110 87

6060

Large bottomcontact

13

18

20

R2R3

H5H4

H6 R1

D5D4

goe_0032

To be usedwith GOE(2)

Dimensions according to Fig. 15 (mm)D4 D5 H4 H5 H6 R1 R2 R3

Masskg Cat. No.

Epoxyinsulated

Pressboardinsulated 1)

117514251675

250258258

230265265

142142142

163180180

628080

230350350

253232

899

1.51.81.8

LF 170 092LF 170 092LF 170 092

-A-K-K

-C-L-L

Table 25. Insulated shield.

1) All dimensions refer to the epoxy insulated shield, which is used as a base. The thickness of the pressboard is 3 mm.

A

370430470

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Nameplate with marking example.

Ordering particularsWhen ordering please fill in the specification tablebelow, or alternatively state the following:

Type and catalogue number for bushing.

Catalogue number for the outer terminal, or if a non-standard terminal is requested: material, diameterD2 and height H2.

Specify draw rod or draw lead system.

If a draw rod system is chosen, the size of thebottom contact (small or large) must be specified.

If a draw lead system is chosen, the full cataloguenumber must be given.

Catalogue number for insulated shield. (A shield isrecommended for BIL 450 kV and higher.)

Other special requirements.

See the ordering examples:

Example 1:

Bushing: GOE 650-500-3150-0.3-B,LF 121 054-B

Outer terminal: LF 170 073-A or -B

Inner connections: Draw lead, LF 170 056-A

Insulated shield: Epoxy insulated, LF 170 046-U

Example 2:

Bushing: GOE 1550-1050-2500-0.6-B,

LF 121 072-A

Outer terminal: LF 170 073-A or -B

Inner connections: Draw rod, upper part LF 170 057,lower part LF 170 059, smallcontact (On request the lower partof the draw rod can be sentseparately at an earlier deliverydate.)

Insulated shield: Pressboard coated, LF 170 046-VP

Example 3:

Bushing: GOE 1300-1050-2500-0.3-B,LF 121 071-B

Outer terminal: Silver plated, D2=50, H2=100

Inner connections: Draw rod, upper part LF 170 057,lower part LF 170 059, smallcontact (On request the lower partof the draw rod can be sentseparately at an earlier deliverydate.)

Insulated shield: Pressboard coated, LF 170 046-VP

Other requirements: Test voltage 690 kV

Tan over C2

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1ZSE

2750-105en,

Rev.

5,

2005-04-15

ABB Power Technologies ABComponentsVisiting address:Lyviksvgen 10Postal address:SE-771 80 Ludvika, SWEDENTel.+46 240 78 20 00Fax +46 240 121 57E-mail: [email protected]

www.abb.com/electricalcomponents

Documents

1ZSE 2750-105