1zse 2750-105 en, rev. 6 - abb group · the goe bushing is available in two designs: goe and...
TRANSCRIPT
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
-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
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)
Table 3. Electrical data GOE 250 - GOE 450
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
-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
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
Table 6. Electrical data GOE 650 - GOE 900
Other data for information
TypeGOE
Flangeextension
Wet powerfrequency
AC
kV, RMS
Dry
switching
impulsekV, Peak
Nom. cap.
betweenconductor andtest tap (C1)
C1±10% (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
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
Table 8. Mechanical loading GOE 650 - GOE 900
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
Table 9. Dimensions GOE 1050 - GOE 1300
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
Table 10. Electrical data GOE 1050 - GOE 1300
Other data for information
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. test load 1 minacc. to IEC 60137 (N)
Max. permitted load (N)in operation at mounting angle0° -30° -60°
13000
1200010000
100009000
10000
650060005000
5000
45005000
43004300
4400
300025004100
3100
3100
–1500–
–
Table 12. Mechanical loading GOE 1050 - GOE 1300
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
12 mountingholes ∅23
30° M12Test tap
Earthed
layer
∅450
∅382
158
L1
L2
L3L4
L5 D6
∅422
∅300
D1
25310
D7
12
GOE 1550-1050 to GOE 1800-1300Nominal voltage 550 kVLightning impulse 1550 kV to 1800 kV
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
Table 13. Dimensions GOE 1550 - GOE 1800
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
Table 14. Electrical data GOE 1550 - GOE 1800
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
Other data for information
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
Table 16. Mechanical loading GOE 1550 - GOE 1800
GOE 1550-1050
GOE 1675-1175GOE 1675-1300
GOE(2) 1675-1300GOE 1800-1300
13
∅660
12 mountingholes ∅24
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
12 mountingholes ∅23
Test tap M1230°
Earthedlayer
goe_0031
∅450
∅382
158
L1
L2
∅50
L3L4
L5
∅300
∅462
25310
∅500
14
GOE 2100-1425 to GOE 2550-1600Nominal voltage 800 kVLightning impulse 2100 kV to 2550 kV
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
Table 17. Dimensions GOE 2100 - GOE 2550
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
Table 18. Electrical data GOE 2100 - GOE 2550
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)
Table 19. Electrical data GOE 2100 - GOE 2550
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. 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
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
Threaded hole M8for pulling wire
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
Threaded hole M8for pulling wire
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
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27
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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