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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
-A/-AA-B/-AB-C/-AC-D/-AD
-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)
Table 3. Electrical data GOE 250 - GOE 450
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
-A/-AA-B/-AB-C/-AC-D/-AD
-A/-AA-B/-AB-C/-AC-D/-AD
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
Phase-to-earthvoltageU
Y
kV, RMS
DrylightningimpulseLIkV, Peak
WetswitchingimpulseSIkV, Peak
Routine test1 min dry50 HzkV, RMS
650-500900-650
245245
155170
650950
500650
325395
Table 6. Electrical data GOE 650 - GOE 900
Other data for information
TypeGOE
Flangeextension
Wet powerfrequencyACkV, RMS
DryswitchingimpulsekV, Peak
Nom. cap.betweenconductor andtest tap (C1)C110% (pF)
Table 7. Electrical data GOE 650 - GOE 900
650-500
900-650
0.6 / 0.3
0.6 / 0.3
315
395
650
750
498 / 392
448 / 365
TypeGOE
650-500900-650
Max. test load 1 minacc. to IEC 60137 (N)
Max. permitted load (N)in operation at mounting angle0 -30 -60
57005000
28002500
23002000
17001500
Table 8. Mechanical loading GOE 650 - GOE 900
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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
Table 9. Dimensions GOE 1050 - GOE 1300
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
Phase-to-earthvoltageU
Y
kV, RMS
DrylightningimpulseLIkV, Peak
WetswitchingimpulseSIkV, Peak
GOE 1050-750GOE 1175-850GOE(2) 1175-850GOE 1300-1050GOE 1300-1150GOE(2) 1425-1050
362362362420420420
220220220245245243
105011751175142514251425
750850850105011751050
505530560630680690
Table 10. Electrical data GOE 1050 - GOE 1300
Other data for information
Flangeextension
Wet powerfrequencyACkV, RMS
DryswitchingimpulsekV, Peak
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
Max. test load 1 minacc. to IEC 60137 (N)
Max. permitted load (N)in operation at mounting angle0 -30 -60
1300012000100001000090005000
650060005000500045002500
430043004400300025001600
310031001500
Table 12. Mechanical loading GOE 1050 - GOE 1300
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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GOE 1550-1050 to GOE 1800-1300Nominal voltage 550 kVLightning impulse 1550 kV to 1800 kV
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
Table 13. Dimensions GOE 1550 - GOE 1800
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
Table 14. Electrical data GOE 1550 - GOE 1800
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
Other data for information
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)
Max. permitted load (N)in operation at mounting angle0 -30 -60
160001600013000500013000
80008000650025006500
47004700430014004300
2500250015001500
Table 16. Mechanical loading GOE 1550 - GOE 1800
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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GOE 2100-1425 to GOE 2550-1600Nominal voltage 800 kVLightning impulse 2100 kV to 2550 kV
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
Table 17. Dimensions GOE 2100 - GOE 2550
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
Phase-to-earthvoltageU
Y
kV, RMS
DrylightningimpulseLIkV, Peak
WetswitchingimpulseSIkV, Peak
2100-14252550-15502550-1600
800800800
485485485
210025502550
142515501620
97010001000
Table 18. Electrical data GOE 2100 - GOE 2550
Other data for information
TypeGOE
Flangeextension
Wet powerfrequencyACkV, RMS
DryswitchingimpulsekV, Peak
Nom. cap.betweenconductor andtest tap (C1)C110% (pF)
Table 19. Electrical data GOE 2100 - GOE 2550
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
Max. test load 1 minacc. to IEC 60137 (N)
Max. permitted load (N)in operation at mounting angle0 -30 -60
15700 7850 5400 3600
Table 20. Mechanical loading GOE 2100 - GOE 2550
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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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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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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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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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