1ZSE 2750-105 en, Rev. 6 - ABB Group · The GOE bushing is available in two designs: GOE and GOE(2). The bushing is built up around a centre tube on ... 20° 1ZSE 2750-105 en, Rev

Transformer bushings, type GOE and GOE(2)

Technical guide

1ZSE 2750-105 en, Rev. 6, 2006-10-15

2

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 inconjunction with the Selection Guide to 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.

3

Table of Contents

Design _______________________ 4

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

Testing _______________________ 6

Test tap ____________________________ 7Test tap adapter______________________ 7

Common specifications __________ 7

GOE 250-210 to 450-400 ________ 8

GOE 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 _______________ 15

Short-time current ____________________ 15Overload capacity of bushings __________ 15

Connection details______________ 16

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

End-shields ___________________ 20

GOE features _______________________ 20GOE(2) features _____________________ 21

Ordering particulars ____________ 22

4

DesignThe GOE bushing is available in two designs: GOE andGOE(2). The bushing is built up around a centre tube onwhich the condenser body is wound. The condenserbody is wound from insulating paper. For bushings up to550 kV paper of full width is employed. Bushings forhigher voltages are wound from paper strips in a mannersimilar 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 current

transformers

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

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 gaugeTop housing

Cemented flange

Bottom end nut

Porcelain insulator,oil side

Mounting flange

goe_0028

5

transformer winding and the draw lead or otherconductors in the bushing. The maximum stresses inthe oil at the surface of the shield insulation must belimited 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 thebushing. 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 componentstogether 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, thus

improving 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 canbe obtained on request. The current shall be reduced forhorizontal mounting and up to 15° from horizontal.

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.

6

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, each bushing issubjected to a number of routine tests, according toIEC 60137 or IEEE bushing standards. A tightness testis carried out on the assembled bushing after the finaldrying and impregnation. The test is made at an oiloverpressure of 180 kPa (1.8 bar) for 12 hours atambient temperature. No sign of leakage is allowed. Theelectrical routine test is carried out at room temperaturewith the lower end of the bushing submerged in oil.Capacitance and tan δ are measured in steps up to thepower frequency withstand voltage, which is maintainedfor one minute.

Capacitance and tan δ are also measured with decrea-sing voltage at the same voltage levels as before the

one 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 δ 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 to bothIEC 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.

7

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 surrounding

medium:

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.

8

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

Fig. 5.

∅300

6 mounting

holes ∅2030°

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

1425±40-"--"--"-

2380±65-"--"--"-

3355±90-"--"--"-

D1mm

L1±20mm

L2±25mm

L3mm

L4mm

L5±5mm

48483838

48483838

48483838

550-"--"--"-

825-"--"--"-

1120-"--"--"-

1060-"--"--"-

1335-"--"--"-

1630-"--"--"-

605305

605305

605305605305

605305605305

670375670375

630320630320

725430725430

985685985685

985685985685

985685985685

200190245225

240230290270

275265330315

Masskg

Table 1. Dimensions GOE 250 - GOE 450

Rating plate data

Type

GOE

Rated

voltage

Um

kV, RMS

Phase-

to-earth

voltage

UY

kV, RMS

Dry

lightning

impulse

LI

kV, Peak

Wet

switching

impulse

SI

kV, Peak

Routine test

1 min dry

50 Hz

kV, RMS

250-210

380-300

450-400

52

123

170

52

84

123

250

450

550

210

300

400

120

185

260

Table 2. Electrical data GOE 250 - GOE 450

Other data for information

Type

GOE

Flange

extension

Wet power

frequency

ACkV, RMS

Dry

switchingimpulsekV, Peak

Nom. cap.betweenconductor and

test tap (C1)

C1±10% (pF)


250-210

380-300450-400

0.6 / 0.30.6 / 0.30.6 / 0.3

120170

240

400550

650

810 / 594

594 / 448543 / 423

Type

GOE

250-210380-300450-400

Max. test load 1 min

acc. to IEC 60137 (N)

Max. permitted load (N)

in operation at mounting angle0° -30° -60°

570057005000

280028002500

230023002000

170017001500

Table 4. Mechanical loading GOE 250 - GOE 450

9

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

Fig. 6.

8 mounting

holes ∅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

4045±105-"--"--"-

5735±150-"--"--"-

D1mm

L1mm

L2mm

L3mm

L4mm

L5±5mm

48483838

48483838

1300±27-"--"--"-

605305605305

605305605305

615315615315

700400700400

11358351135835

11358351135835

340320400380

405390480455

Masskg

1800±37-"--"--"-

1810±33-"--"--"-

2310±42-"--"--"-

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

Rating plate data

Type

GOERated

voltage

Um

kV, RMS

Phase-

to-earth

voltage

UY

kV, RMS

Dry

lightning

impulse

LI

kV, Peak

Wet

switching

impulse

SI

kV, Peak

Routine test

1 min dry

50 Hz

kV, RMS

650-500

900-650

245

245

155

170

650

950

500

650

325

395



TypeGOE

Flangeextension

Wet powerfrequency

AC

kV, RMS

Dry

switching

impulsekV, Peak

Nom. cap.

betweenconductor andtest tap (C1)

C1±10% (pF)


650-500

900-650

0.6 / 0.3

0.6 / 0.3

315

395

650

750

498 / 392

448 / 365

Type

GOE

650-500

900-650

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

Max. permitted load (N)in operation at mounting angle

0° -30° -60°

57005000

28002500

23002000

17001500


10

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

Type CatalogueNumber

GOE1050-750

GOE

1300-1050

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

2500

2500

0.60.30

0.60.300.60.30

0.6

0.3

7205±185-"--"-

7955±205-"--"--"--"--"-

10290±265

-"-

D1mm

L1mm

L2mm

L3mm

L4mm

L5±5mm

484848

484848383838

48

48

2230±55-"--"-

3070±60-"--"-

1005

985

60530556053055

6053055

6103353561033535

1335

1035

65539090

620

320

1335103573513351035735

13351035735

775755730

830810785935910875

605

305

Masskg


GOE(2)

1425-1050

2470±55-"--"--"--"--"-

3310±60-"--"--"--"--"-

LF 121 570

3225±54

-"-

4065±59

-"-

600

300

-A/-AA

-B/-AB

1600

1600

0.6

0.3

11750±350

-"-

50

50

3250±4

-"-

4136±10

-"-

628

328

1390

1090

770

750

Rating plate data

Type Rated

voltage

Um

kV, RMS

Phase-

to-earth

voltage

UY

kV, RMS

Dry

lightning

impulse

LIkV, Peak

Wet

switching

impulse

SI

kV, Peak

GOE 1050-750

GOE 1175-850

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

GOE(2) 1425-1050

362

362362420

420

420

220220220

245

245243

10501175

1175

142514251425

750

850

85010501175

1050

505

530560630

680

690



Flange

extension

Wet power

frequency

AC

kV, RMS

Dry

switching

impulse

kV, Peak

Nom. capacitance

between

conductor and

test tap (C1)

C1±10% (pF)

0.6 / 0.3 / 0

0.6 / 0.3 / 0

0.6 / 0.30.6 / 0.30.6 / 0.3

0.6 / 0.3

480

540560650

650

690

9609501030

1050

11751140

430 / 383 / 308490 / 420 / 345

470 / 407

575 / 560575 / 545532 / 474

Type

GOE 1050-750

GOE 1175-850

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

GOE(2) 1425-1050


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

13000

1200010000

100009000

10000

650060005000

5000

45005000

43004300

4400

300025004100

3100

3100

–1500–

–


Routine

test

1 min dry

50 Hz

kV, RMS

GOE(2)1175-850

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

16001600

0.60.3

9150±400-"-

5050

580565

1225925

635335

600300

2540±4-"-

3426±10-"-

GOE

1300-1150

LF 121 071 605

305

-C/-AC

-D/-AD

2500

2500

0.6

0.3

11600±300

-"-

48

48

3620±56

-"-

4460±61

-"-

620

320

1335

1035

1055

1035

Type

GOE(2) 1175-850

GOE(2) 1425-1050

D6 D7

450

500

400

450

Table 13. Dimensions GOE(2)

11

Fig. 7a. Type GOE

8 mountingholes ∅20

∅430

45°

M12

∅500

∅485

150

L1

L2

Earthed

layer

L3L4

L5

196

∅330

∅480

D1

28

Fig. 7b. Type GOE(2)

goe_0030


30° M12Test tap

Earthed

layer

∅450

∅382

158

L1

L2

L3L4

L5 D6

∅422

∅300

D1

25310

D7

12


Type CatalogueNumber

GOE1550-1050

GOE

1800-1300

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

10130±260-"--"-

L1mm

L2mm

L3mm

L4mm

L5±5mm

3225±54-"--"-

3965±59-"--"-

6053055

65535555

15851285985

145514201385

Masskg


250025002500

0.60.30

11700±300-"--"-

3720±50-"--"-

4460±55-"--"-

6053055

15851285985

63033030

163516001565

GOE1675-1300

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

250025002500

0.60.30

13380±330-"--"-

4220±50-"--"-

5260±55-"--"-

6053055

61031010

15851285985

178517501715

-A/-AA

-B/-AB

-C/-AC

2500

2500

2500

0.6

0.3

0

13380±330

-"-

-"-

4220±50

-"-

-"-

5260±55

-"-

-"-

605

305

5

610

310

10

1585

1285

985

1785

1750

1715

550

550

550

550550

318

318

318

318318

1550

1675

16751675

1800

1050

1175

1300

1300

1300

750

750

750

750800


0.6 / 0.3 / 0

0.6 / 0.3 / 0

0.6 / 0.3 / 0

0.6 / 0.30.6 / 0.3 / 0

660

730

790

750800

1050

1300

13001410

1300

457 / 390 / 342

512 / 440 / 433

500 / 490 / 450

525 / 482

500 / 490 / 450

GOE(2)1675-1300

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

16001600

0.60.3

15200±350-"-

4160±4-"-

5046±10-"-

600300

639339

15851285

10551020

Rating plate data

Type Rated

voltage

Um

kV, RMS

Phase-

to-earth

voltage

UY

kV, RMS

Dry

lightning

impulse

LI

kV, Peak

Wet

switching

impulse

SI

kV, Peak


Flange

extension

Wet power

frequency

AC

kV, RMS

Dry

switching

impulse

kV, Peak

Nom. capacitance

between

conductor and

test tap (C1)

C1±10% (pF)

Routine

test

1 min dry

50 Hz

kV, RMS

GOE 1550-1050

GOE 1675-1175

GOE 1675-1300

GOE(2) 1675-1300GOE 1800-1300

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

Max. permitted load (N)in operation at mounting angle

0° -30° -60°

16000

1600013000

1000013000

800080006500

5000

6500

47004700

4300

39004300

2500

2500

1500–1500


GOE 1550-1050

GOE 1675-1175GOE 1675-1300

GOE(2) 1675-1300GOE 1800-1300

13

∅660


Position oftest tap

M12

30°

∅600

∅565

150

∅48

Earthedlayer

L1L2

L3L4

L5∅720

∅428

28

196

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

∅450


Test tap M1230°

Earthedlayer

goe_0031

∅450

∅382

158

L1

L2

∅50

L3L4

L5

∅300

∅462

25310

∅500

14


Fig. 9.

∅711

30°

M12

12 mounting

holes ∅32

∅600

∅565

150

L1

L2

∅665

Earthed

layer ∅528

L3

L5

L4

216

∅48

28

∅780

Position of

test 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

16630±420-"-

L1mm

L2mm

L3mm

L4mm

L5±5mm

5220±52-"-

6265±57-"-

605305

710410

19551655

26052555

Masskg


250025002500

0.60.30

18320±460-"--"-

5720±52-"--"-

7065±57-"--"-

6053055

195516551355

64034040

276027102650

2550-1600 LF 121 083 250025002500

0.60.30

20000±500-"--"-

6210±58-"--"-

7555±63-"--"-

6053055

64034040

195516551355

291528652805

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

Rating plate data

Type

GOE

Rated

voltage

Um

kV, RMS

Phase-

to-earth

voltage

UY

kV, RMS

Dry

lightning

impulse

LI

kV, Peak

Wet

switching

impulse

SI

kV, Peak

2100-1425

2550-1550

2550-1600

800

800

800

485

485

485

2100

2550

2550

1425

1550

1620

970

1000

1000



Type

GOE

Flange

extension

Wet power

frequency

ACkV, RMS

Dry

switchingimpulsekV, Peak

Nom. cap.

betweenconductor and

test tap (C1)

C1±10% (pF)


2100-14252550-1550

2550-1600

0.6 / 0.30.6 / 0.3 / 0

0.6 / 0.3 / 0

900950

1000

15501675

1760

600 / 575574 / 522 / 476

600 / 550 / 506

TypeGOE

2100-1425


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

15700 7850 5400 3600


Routine

test

1 min dry

50 Hz

kV, RMS

2550-15502550-1600

1400013000

70006500

44003700

25001600

15

Current capacityThe rated currents specified in this catalogue are basedon thermal tests and are in accordance with IEC 60137and 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 mm2 the short-time current (I

th) is 9.6 kA for

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

1600250031505000

1450210027004250

100100100100

75100100100

250250250250

16

Connection detailsThe oil side connection can be made with either a draw-rod system or a draw-lead system. For the air sideconnection 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 rod 1)

Upper draw rod 1)

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 upperend 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 lugsare 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 theflange. This must be stated in the order. The lower partwith contact end shield can then be secured to thecover during transport and storage of the transformer.This system has been supplied by ABB since theseventies with an excellent service record and has thefollowing advantages compared to other methods usedfor high currents:

• 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.

17

D2

∅150

Outerterminal

Threaded hole M8for pulling wire

M16

25

Additional joint

on request

Mountingflange

∅125

5065

Large bottom contactSmall bottom contact

58 39

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


H2

L2

Mountingflange

M1625

60

Additional joint

on requestL5

H1

110

∅110

5165

N1=4

5165

Small

bottom contact

Large

bottom contact

N1 = Number of

holes M12, equipped

with thread insert

with screw lock,

depth 20, for cable

lugs.

GOE GOE(2)

N1=4N1=6N1=4

18

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

D2

∅150

Outer

terminal

H2 Threaded hole M8for pulling wire

350L2

End of

cable

D3

D9 goe_0034

∅125

Outer

terminal

H2


53

L2End of

cable D3

46

D2GOE GOE(2)

D3

mm

D9

mm

Min. innerdiam. D1of bushing

mm

Cond.area

mm2

Current, A

IEC IEEE

Completeinner terminal

Cat. No.

Mass

kg

01)

15

30

35

35

35

38

38

38

-

50

95

150

285

-

205

390

615

1000

-

200

370

540

830

LF 170 056 -A

-B

-C

3.2

3.2

3.2

40

01)

45

45

48

48

450

600

-

1300

1600

-

1100

1360

-

-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.

D3

mm

Conductor

area

mm2

Current, A

IEC IEEE

Complete

inner terminal

Cat. No.

Mass

kg

01)

15

30

42

-

95

285

740

-

300

630

1300

-

260

540

1110

LF 170 091 -A

-B

-C

-D

1.1

1.0

0.9

0.7

1) With pilot hole D=5

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

30

goe_0037

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

AlAlCuCu

Cu

30603040

60

125125125125

125

1250160016001600

1600

LF 170 090 1.01.82.83.4

5.1

-A-B-C-D

-E

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

20

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 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

1000

2500

500

1500 20001000500

0

0

Shield -U/-UP

0

500

1000

Amm

U = Power frequency

LI = Lightning impulse

No shield

Fig. 14. Mounting alternatives.

Shield mounted on

the 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

45°R

min 5

Edges within thisarea should berounded toR

min=5 mm

60°

A

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

ø125ø102

60°

60°

20°

13

18

Large bottom

contact N1= 6

Shield -X/-XP

Shield -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 5

mm for -XP.

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.

Shield

mounted on

the bushing

Shield mounted on the draw rod bottom

contact. (Not possible for small bottom

contact. See page 17.)

Fig. 15. Recommendations for positioning.

Earthed layer

45°Rmin

5

Edges within thisarea should berounded toR

min=5 mm

60°

A

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

ø110 ø87

60°60°

Large bottom

contact

ø13

ø18

20°

R2R3

H5H4

H6 R1

D5

D4

goe_0032

To be used

with GOE(2)Dimensions according to Fig. 15 (mm)D4 D5 H4 H5 H6 R1 R2 R3

Mass

kg Cat. No.

Epoxy

insulated

Pressboard

insulated 1)

1175

14251675

250

258258

230

265265

142

142142

163

180180

62

8080

230

350350

25

3232

8

99

1.5

1.81.8

LF 170 092

LF 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

370

430470

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 δ over C2<1.0 %

Complete Designation Example: GOE 1300-1050-2500-0.3-B

Type

Wet switching impulse, kV

Rated current, A

Length of flange extension, m

Code for colour of air side insulatorB = brown, G = light grey

goe_0041

ABB

GOE 1550-1050-2500-0.6-BLF121072-A No. 1ZSC888999 2005Um/Uy 550/318 kV� Ir 2500 A� fr 50/60 HzLI 1550 kV� SI 1050 kV� AC 660 kVM 1455 kg� L 1585 mm�� 0-60�C1 790 pF� Tan δ 0.455 %C2 1000 pF� Tan δ 0.988 %

1Z

SE

27

50

-10

5 e

n, R

ev. 6

, 2

00

6-1

0-1

5

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

Documents

1ZSE 2750-105 en, Rev. 6 - ABB Group · The GOE bushing is available in two designs: GOE and GOE(2). The bushing is built up around a centre tube on ... 20° 1ZSE 2750-105 en, Rev