Transformer bushings, type GOE and GOE(2)
1ZSE 2750-105 en, Rev. 6, 2006-10-15
Transformer bushings, type GOE and GOE(2) Technical guide
This Technical Guide has been produced to allow transformer manufacturers, and their designers and engineers, access to all the technical information required to assist them in their selection of the appropriate Transformer Bushing. The Guide should be used in conjunction with the Selection Guide to allow the optimum selection to be made. The technical information pertaining to bushings manufactured by ABB has been divided into separate documents, with one document for each type. The information provided in this document is intended to be general and does not cover all possible applications. Any specific application not covered should be referred directly to ABB, or its authorized representative. ABB makes no warranty or representation and assumes no liability for the accuracy of the information in this document or for the use of such information. All information in this document is subject to change without notice.
2
Table of Contents Design _______________________ 4 GOE features _______________________ 5 GOE(2) features _____________________ 5 Shed form __________________________ 6
Testing _______________________ 6 Test tap ____________________________ 7 Test 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 ____________________ 15 Overload capacity of bushings __________ 15
Connection details______________ 16 Draw rod system _____________________ 16 Draw lead system ____________________ 18 Outer terminal _______________________ 19
End-shields ___________________ 20 GOE features _______________________ 20 GOE(2) features _____________________ 21
Ordering particulars ____________ 22
3
Design The GOE bushing is available in two designs: GOE and GOE(2). The bushing is built up around a centre tube on which the condenser body is wound. The condenser body is wound from insulating paper. For bushings up to 550 kV paper of full width is employed. Bushings for higher voltages are wound from paper strips in a manner similar to that used for cables.
The mounting flange is an aluminium alloy casting. The gasket surface is machined flat. On the flange there is a test tap. This tap is automatically earthed by a protective cap when the tap is not connected to external test or measuring circuits. The mounting flange and the top housing are protected by a two-component grey-blue paint.
The foils are located so that the best possible combination of external flashover and internal puncture strength is achieved.
The mounting flange can be equipped with extensions on the oil side, providing space for current transformers. Extension lengths 300 and 600 mm are available as standard, but other lengths can be quoted on request.
The upper insulator, which is made in one piece without gaskets, the lower insulator and the mounting flange are held between the end plates by the centre tube and sealing is accomplished by oil-resistant rubber gaskets in grooves.
The rated current is defined according to IEC 60137. It is valid only when the centre tube is used as conductor. For draw lead applications the permissible current will be lower.
For GOE 250 to 900 the top housing is equipped with two oil level gauges of prisma type. For GOE 1050 and larger, the top housing is equipped with a magnetic oil level indicator.
Bushings GOE 450 and larger require a shield at the oil end. The purpose of this shield is to avoid excessive electrical stresses in the oil at the lower end plate and at the connection between the insulated lead from the
Top end nut Top end nut
Set of springs
Sealing plug
Flexible connection
Top housing
Top housing Oil level gauge
Porcelain insulator, air side
Porcelain insulator, air side
Transformer oil
Sealing plug Oil level gauge
Pre-stressed tubes Transformer oil Condenser body Condenser body
Clamping ring Cemented flange
Mounting flange Extension for current transformers
Mounting flange Extension for current transformers
Porcelain insulator, oil side
Porcelain insulator, oil side
Bottom end nut
Bottom end nut
goe_0028
Fig. 1. Transformer bushings types GOE and GOE(2). 4
transformer winding and the draw lead or other conductors in the bushing. The maximum stresses in the oil at the surface of the shield insulation must be limited to those values normal for insulated conductors and similar components in the same transformer.
The bushing is designed to be mounted at an angle not exceeding 60° from the vertical. A higher inclination can be obtained on request. The current shall be reduced for horizontal mounting and up to 15° from horizontal. The top housing is made of aluminium and has expansion space for the oil, sufficient for temperature variations in the bushing between -40° and +80 °C. Variations in the length of the centre tube and the housing are compensated by a flexible connection inside the top housing.
ABB manufactures shields of this type, which are quoted for and delivered separately. The shields are made of aluminium and are insulated with epoxy or a lining of pressboard. The shield may be mounted on the lower end plate of the bushing, or on the bottom contact of the draw rod. Dimensions and recommendations, see pages 17, 20 and 21.
For GOE 1050 and larger, the upper insulator is fastened with an additional clamping ring to the mounting flange.
It is of great importance that the shield is placed in the right position in order to protect the bottom end of the bushing. Guidelines for positioning of the shield are given in Figs. 14 and 16. ABB can also provide assistance with field calculations to confirm the performance of other shielding systems.
GOE(2) features A set of springs in the top housing provides adequate pressure on all gaskets, independently of temperature and load conditions.
Quotations for modifications in design and additional parts such as special terminal studs, shields, rod gaps, etc., as well as special tests, are given on request.
The bushing is designed to be mounted at an angle not exceeding 30° from the vertical. The top housing has expansion space for the oil sufficient for temperature variations in the bushing between-40° and +80 °C. Variations in the lenght of the centre tube are compensated by the flexible cover of the housing.
GOE features A set of concentric tubes are prestressed and serve as springs which hold the main bushing components together and provide adequate pressure on the gaskets in all expected temperature and load conditions.
For GOE(2) the upper insulator is cemented to a flange which is bolted to the mounting flange.
The annular space formed between the tubes makes an efficient cooling duct for dissipation of the heat, thus improving the current-carrying capacity and thermal stability of the bushing.
5
Shed form The shed form for all GOE bushings is of the anti-fog type with alternating long and short sheds. GOE: For each pair of sheds the ratio between nominal creepage distance and the axial length is 3.43 and the ratio between protected and nominal creepage distance is 0.40.
GOE(2): For each pair of sheds the ratio between nominal creepage distance and the axial length is 3.94 and the ratio between protected and nominal creepage distance is 0.43. 66
65
51
36 R10
R10 R8
R8 R10 10°
R10
27.5
10°
18° R8
R5.5
10°
70
18° R8
10°
18° R5.5
31
R4.5
70
18° R4.5 goe_0029
Fig. 2. Shed form, GOE and GOE(2).
Testing During manufacture and on completion, each bushing is subjected to a number of routine tests, according to IEC 60137 or IEEE bushing standards. A tightness test is carried out on the assembled bushing after the final drying and impregnation. The test is made at an oil overpressure of 180 kPa (1.8 bar) for 12 hours at ambient temperature. No sign of leakage is allowed. The electrical routine test is carried out at room temperature with the lower end of the bushing submerged in oil. Capacitance and tan δ are measured in steps up to the power frequency withstand voltage, which is maintained for one minute.
one minute test. Measurements for detection of internal partial 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 always demonstrated that the PD value is below 5 pC at rated voltage (=√3 times bushing service voltage). Bushings with BIL level ≥ 850 kV are routine tested with a dry lightning impulse voltage withstand test, when tested according to IEC 60137. Type tests have been carried out according to both IEC 60137 and IEEE. Type test reports are available on request.
Capacitance and tan δ are also measured with decreasing voltage at the same voltage levels as before the
6
Test tap
Test tap adapter
All GOE bushings are equipped with a test tap connected to the outer layer of the condenser body. The max. test voltage of the tap is 20 kV, 50 Hz for one minute. The routine test voltage is 20 kV. Max. service voltage is 6 kV.
For permanent connection of the test tap to measuring circuits, a test tap adapter is required. Catalogue number 2769 522-C.
In connection with an external capacitance the test tap can be used as a voltage tap. The test tap has dimensions according to IEEE Potential tap type A.
(Pg 16 acc. to DIN 40430) Pr 22.5 Turnable in optional direction
goe_0019
Fig. 3. Test tap
Fig. 4. Test tap adapter.
Common specifications Application:
Transformers
Classification:
Oil impregnated paper, capacitance graded, outdoor immersed bushing
Ambient temperature:
+40 °C to -40 °C, minimum value acc. to temperature class 2 of IEC 60137.
Altitude of site:
< 1 000 m
Level of rain and humidity:
1-2 mm rain/min. horizontally and vertically, as per IEC 60060-1.
Pollution level:
According to specified creepage distance and IEC 60815 1).
Immersion medium:
Transformer oil. Maximum daily mean temperature 90 °C. Maximum temporary oil temperature 115 °C.
Oil level in transformer:
Not lower than 30 mm from the bushing flange.
Max. pressure of surrounding medium:
100 kPa over pressure.
Markings:
Conforming to IEC/ IEEE
For conditions exceeding the standard specification above, please consult ABB. 1) IEC 60815 "Guide for the selection of insulators in respect of polluted conditions."
7
GOE 250-210 to GOE 450-400 Nominal voltages 52 kV to 170 kV Lightning impulse 250 kV to 550 kV Rated current A
Flange extension
Creepage distance mm
D1 mm
L1±20 L2±25 L3 mm mm mm
L4 mm
L5±5 mm
Mass kg
-A/-AA -B/-AB -C/-AC -D/-AD
3150 3150 5000 5000
0.6 0.3 0.6 0.3
1425±40 -"-"-"-
48 48 38 38
550 -"-"-"-
1060 -"-"-"-
605 305 605 305
725 430 725 430
985 685 985 685
200 190 245 225
LF 121 052
-A/-AA -B/-AB -C/-AC -D/-AD
3150 3150 5000 5000
0.6 0.3 0.6 0.3
2380±65 -"-"-"-
48 48 38 38
825 -"-"-"-
1335 -"-"-"-
605 305 605 305
670 375 670 375
985 685 985 685
240 230 290 270
LF 121 053
-A/-AA -B/-AB -C/-AC -D/-AD
3150 3150 5000 5000
0.6 0.3 0.6 0.3
3355±90 -"-"-"-
48 48 38 38
1120 -"-"-"-
1630 -"-"-"-
605 305 605 305
630 320 630 320
985 685 985 685
275 265 330 315
Type GOE
Catalogue Number
Insulator colour Brown/Light grey
250-210
LF 121 051
380-300
450-400
Table 1. Dimensions GOE 250 - GOE 450 ∅300
Rating plate data 6 mounting holes ∅20
30°
Type GOE
M12
Rated voltage Um kV, RMS
250-210 52 380-300 123 450-400 170
Phaseto-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
52 84 123
250 450 550
210 300 400
120 185 260
Table 2. Electrical data GOE 250 - GOE 450 130 ∅350
Other data for information
∅386
Type GOE
Flange extension
Wet power frequency AC kV, RMS
Dry switching impulse kV, Peak
Nom. cap. between conductor and test tap (C1) C1±10% (pF)
250-210 380-300 450-400
0.6 / 0.3 0.6 / 0.3 0.6 / 0.3
120 170 240
400 550 650
810 / 594 594 / 448 543 / 423
L2 L1
Table 3. Electrical data GOE 250 - GOE 450
25 115 ∅224 L3
∅350
L4
Type GOE
Max. test load 1 min acc. to IEC 60137 (N)
Max. permitted load (N) in operation at mounting angle -30° -60° 0°
250-210 380-300 450-400
5700 5700 5000
2800 2800 2500
L5 Earthed layer D1
2300 2300 2000
1700 1700 1500
Table 4. Mechanical loading GOE 250 - GOE 450 Fig. 5. 8
GOE 650-500 to GOE 900-650 Nominal voltage 245 kV Lightning impulse 650 kV to 950 kV Type GOE
Catalogue Number
Insulator colour Brown/Light grey
Rated current A
Flange extension
Creepage distance mm
D1 mm
L1 mm
L2 mm
L3 mm
L4 mm
L5±5 mm
Mass kg
650-500
LF 121 054
-A/-AA -B/-AB -C/-AC -D/-AD
3150 3150 5000 5000
0.6 0.3 0.6 0.3
4045±105 -"-"-"-
48 48 38 38
1300±27 -"-"-"-
1810±33 -"-"-"-
605 305 605 305
700 400 700 400
1135 835 1135 835
340 320 400 380
900-650
LF 121 055
-A/-AA -B/-AB -C/-AC -D/-AD
3150 3150 5000 5000
0.6 0.3 0.6 0.3
5735±150 -"-"-"-
48 48 38 38
1800±37 -"-"-"-
2310±42 -"-"-"-
605 305 605 305
615 315 615 315
1135 835 1135 835
405 390 480 455
Table 5. Dimensions GOE 650 - GOE 900. (See also Technical Guide GOM, 1ZSE 2750-108.)
M12
∅350 Rating plate data
45°
Type GOE 8 mounting holes ∅20
Rated voltage Um kV, RMS
650-500 245 900-650 245
130 ∅350
Phaseto-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
155 170
650 950
500 650
325 395
Table 6. Electrical data GOE 650 - GOE 900 ∅386
Other data for information L2
Type GOE
Flange extension
Wet power frequency AC kV, RMS
Dry switching impulse kV, Peak
Nom. cap. between conductor and test 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
L1
Table 7. Electrical data GOE 650 - GOE 900
25 115 ∅264 L4 L5
L3
∅400
Type GOE
Max. test load 1 min Max. permitted load (N) acc. to IEC 60137 (N) in operation at mounting angle -30° -60° 0°
650-500 900-650
5700 5000
Earthed layer D1
2800 2500
2300 2000
1700 1500
Table 8. Mechanical loading GOE 650 - GOE 900
Fig. 6. 9
GOE 1050-750 to GOE 1425-1050 Nominal voltages 362 kV to 420 kV Lightning impulse 1050 kV to 1425 kV Type
Catalogue Number
Insulator Rated colour current Brown/Light grey A
Flange extension
Creepage distance mm
D1 mm
L1 mm
L3 mm
L4 mm
L5±5 mm
Mass kg
L2 mm
GOE 1050-750
LF 121 063
-A/-AA -B/-AB -C/-AC
2500 2500 2500
0.6 0.3 0
7205±185 -"-"-
48 48 48
2230±55 3070±60 605 305 -"-"-"-"5
655 390 90
1335 1035 735
775 755 730
GOE 1175-850
LF 121 061
-A/-AA -B/-AB -C/-AC -D/-AD -E/-AE -F/-AF
2500 2500 2500 5000 5000 5000
0.6 0.3 0 0.6 0.3 0
7955±205 -"-"-"-"-"-
48 48 48 38 38 38
2470±55 -"-"-"-"-"-
3310±60 -"-"-"-"-"-
605 305 5 605 305 5
610 335 35 610 335 35
1335 1035 735 1335 1035 735
830 810 785 935 910 875
GOE(2) 1175-850
LF 121 560
-A/-AA -B/-AB
1600 1600
0.6 0.3
9150±400 -"-
50 50
2540±4 -"-
3426±10 600 -"300
635 335
1225 925
580 565
GOE LF 121 071 1300-1050
-A/-AA -B/-AB
2500 2500
0.6 0.3
10290±265 -"-
48 48
3225±54 4065±59 605 305 -"-"-
620 320
1335 1035
1005 985
GOE LF 121 071 1300-1150
-C/-AC -D/-AD
2500 2500
0.6 0.3
11600±300 -"-
48 48
3620±56 4460±61 605 -"-"305
620 320
1335 1035
1055 1035
GOE(2) LF 121 570 1425-1050
-A/-AA -B/-AB
1600 1600
0.6 0.3
11750±350 -"-
50 50
3250±4 -"-
628 328
1390 1090
770 750
4136±10 600 -"300
Table 9. Dimensions GOE 1050 - GOE 1300
Rating plate data
Other data for information
Type
Rated voltage Um kV, RMS
Phaseto-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
Flange extension
Wet power frequency AC kV, RMS
Dry switching impulse kV, Peak
Nom. capacitance between conductor and test tap (C1) C1±10% (pF)
GOE 1050-750 GOE 1175-850 GOE(2) 1175-850 GOE 1300-1050 GOE 1300-1150 GOE(2) 1425-1050
362 362 362 420 420 420
220 220 220 245 245 243
1050 1175 1175 1425 1425 1425
750 850 850 1050 1175 1050
505 530 560 630 680 690
0.6 / 0.3 / 0 0.6 / 0.3 / 0 0.6 / 0.3 0.6 / 0.3 0.6 / 0.3 0.6 / 0.3
480 540 560 650 650 690
960 950 1030 1050 1175 1140
430 / 383 / 308 490 / 420 / 345 470 / 407 575 / 560 575 / 545 532 / 474
Table 10. Electrical data GOE 1050 - GOE 1300
Type
GOE 1050-750 GOE 1175-850 GOE(2) 1175-850 GOE 1300-1050 GOE 1300-1150 GOE(2) 1425-1050
Max. test load 1 min acc. to IEC 60137 (N)
Max. permitted load (N) in operation at mounting angle -30° -60° 0°
13000 12000 10000 10000 9000 10000
6500 6000 5000 5000 4500 5000
4300 4300 4400 3000 2500 4100
3100 3100 – 1500 – –
Table 12. Mechanical loading GOE 1050 - GOE 1300
10
Type
D6
D7
GOE(2) 1175-850 GOE(2) 1425-1050
450 500
400 450
Table 13. Dimensions GOE(2)
Test tap
45°
M12
30°
8 mounting holes ∅20
M12
12 mounting holes ∅23
D7 ∅430 150
158 ∅500
∅450
∅485
∅382
L2
L2
L1 L1
∅422
28 196 310 L4
L3
∅330 L4
L5
Earthed layer
25
∅480
L5 D1
L3
∅300
Earthed layer
D6 D1
goe_0030
Fig. 7a. Type GOE
Fig. 7b. Type GOE(2) 11
GOE 1550-1050 to GOE 1800-1300 Nominal voltage 550 kV Lightning impulse 1550 kV to 1800 kV Type
Catalogue Number
Insulator colour Brown/Light grey
Rated current A
Flange extension
Creepage distance mm
L1 mm
GOE 1550-1050
LF 121 072
-A/-AA -B/-AB -C/-AC
2500 2500 2500
0.6 0.3 0
10130±260 -"-"-
GOE 1675-1175
LF 121 073
-A/-AA -B/-AB -C/-AC
2500 2500 2500
0.6 0.3 0
GOE 1675-1300
LF 121 073
-D/-AD -E/-AE -F/-AF
2500 2500 2500
GOE(2) 1675-1300
LF 121 580
-A/-AA -B/-AB
GOE 1800-1300
LF 121 074
-A/-AA -B/-AB -C/-AC
L2 mm
L3 mm
L4 mm
L5±5 mm
Mass kg
3225±54 3965±59 -"-"-"-"-
605 305 5
655 355 55
1585 1285 985
1455 1420 1385
11700±300 -"-"-
3720±50 4460±55 -"-"-"-"-
605 305 5
630 330 30
1585 1285 985
1635 1600 1565
0.6 0.3 0
13380±330 -"-"-
4220±50 5260±55 -"-"-"-"-
605 305 5
610 310 10
1585 1285 985
1785 1750 1715
1600 1600
0.6 0.3
15200±350 -"-
4160±4 -"-
5046±10 -"-
600 300
639 339
1585 1285
1055 1020
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
Table 13. Dimensions GOE 1550 - GOE 1800
Rating plate data
Other data for information
Type
Rated voltage Um kV, RMS
Phaseto-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
Flange extension
Wet power frequency AC kV, RMS
Dry switching impulse kV, Peak
Nom. capacitance between conductor and test tap (C1) C1±10% (pF)
GOE 1550-1050 GOE 1675-1175 GOE 1675-1300 GOE(2) 1675-1300 GOE 1800-1300
550 550 550 550 550
318 318 318 318 318
1550 1675 1675 1675 1800
1050 1175 1300 1300 1300
750 750 750 750 800
0.6 / 0.3 / 0 0.6 / 0.3 / 0 0.6 / 0.3 / 0 0.6 / 0.3 0.6 / 0.3 / 0
660 730 790 750 800
1050 1300 1300 1410 1300
457 / 390 / 342 512 / 440 / 433 500 / 490 / 450 525 / 482 500 / 490 / 450
Table 14. Electrical data GOE 1550 - GOE 1800
Type
Max. test load 1 min acc. to IEC 60137 (N)
Max. permitted load (N) in operation at mounting angle -30° -60° 0°
GOE 1550-1050 GOE 1675-1175 GOE 1675-1300 GOE(2) 1675-1300 GOE 1800-1300
16000 16000 13000 10000 13000
8000 8000 6500 5000 6500
4700 4700 4300 3900 4300
2500 2500 1500 – 1500
Table 16. Mechanical loading GOE 1550 - GOE 1800
12
30°
Test tap
Position of test tap
30°
M12 12 mounting holes ∅23
M12
∅450
12 mounting holes ∅24 ∅660
158 ∅450 ∅600
∅382
150 ∅565
L2 L1
L2 L1
28 ∅462
196 L4
L5
310
∅428
L3
L4
Earthed layer ∅720
L5
25 L3
∅300
Earthed layer
∅500
∅48 ∅50 goe_0031
Fig. 8a. Type GOE
Fig. 8b. Type GOE(2) 13
GOE 2100-1425 to GOE 2550-1600 Nominal voltage 800 kV Lightning impulse 2100 kV to 2550 kV Type GOE
Catalogue Number
Insulator colour Brown/Light grey
Rated current A
Flange extension
Creepage distance mm
L1 mm
L2 mm
L3 mm
L4 mm
L5±5 mm
Mass kg
2100-1425 LF 121 081
-A/-AA -B/-AB
2500 2500
0.6 0.3
16630±420 -"-
5220±52 6265±57 -"-"-
605 305
710 410
1955 1655
2605 2555
2550-1550 LF 121 082
-A/-AA -B/-AB -C/-AC
2500 2500 2500
0.6 0.3 0
18320±460 -"-"-
5720±52 7065±57 -"-"-"-"-
605 305 5
640 340 40
1955 1655 1355
2760 2710 2650
2550-1600 LF 121 083
-A/-AA -B/-AB -C/-AC
2500 2500 2500
0.6 0.3 0
20000±500 -"-"-
6210±58 7555±63 -"-"-"-"-
605 305 5
640 340 40
1955 1655 1355
2915 2865 2805
Table 17. Dimensions GOE 2100 - GOE 2550
30°
Position of test tap
Rating plate data
∅711
M12 12 mounting holes ∅32
∅600
150
∅565
Type GOE
Rated voltage Um kV, RMS
Phaseto-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
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
2100-1425 2550-1550 2550-1600
0.6 / 0.3 900 0.6 / 0.3 / 0 950 0.6 / 0.3 / 0 1000
L2
L1
∅665
Wet power frequency AC kV, RMS
Dry switching impulse kV, Peak
Nom. cap. between conductor and test tap (C1) C1±10% (pF)
1550 1675 1760
600 / 575 574 / 522 / 476 600 / 550 / 506
Table 19. Electrical data GOE 2100 - GOE 2550
216 28 Type GOE L4
L5
L3 Earthed layer
∅528 ∅780
Max. test load 1 min Max. permitted load (N) acc. to IEC 60137 (N) in operation at mounting angle 0° -30° -60°
2100-1425 15700
7850
5400
3600
2550-1550 14000 2550-1600 13000
7000 6500
4400 3700
2500 1600
Table 20. Mechanical loading GOE 2100 - GOE 2550
∅48
Fig. 9. 14
Current capacity The rated currents specified in this catalogue are based on thermal tests and are in accordance with IEC 60137 and apply to the built-in conductors of the bushings. The GOE bushings conform to the requirements of IEC 60137 and IEEE for currents given in Table 25.
Overload capacity of bushings If the conductor for the bushing is selected with 120 % of the rated current of the transformer, the bushing is considered to be able to withstand overload conditions according to IEC 60354 without further clarification or tests. This recommendation complies with IEC 60137.
Short-time current The rated thermal short-time current (Ith), as defined in IEC 60137 clause 5, is listed in Table 25 for draw rod and fixed bottom end terminal. For draw lead of stranded copper with the area 100 mm2 the short-time current (Ith) 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 (Id) is 2.5 times the 1 second short-time current.
Rated current IEC A
Current IEEE A
Short-time Ith 1s kA
current Ith 2s kA
Dynamic current Id peak kA
1600 2500 3150 5000
1450 2100 2700 4250
100 100 100 100
75 100 100 100
250 250 250 250
Table 25. Rated current, short-time current and dynamic current as defined in IEC 60137, for draw rod and fixed bottom end terminal.
15
Connection details The oil side connection can be made with either a drawrod system or a draw-lead system. For the air side connection the same outer terminals are provided for both systems. When ordering, please specify the items stated below.
During installation on the transformer, the upper end of this rod is bolted to a spring device beneath the outer terminal, which consists of two concentric tubes of different materials and is so designed that it gives the required contact load at all temperatures.
Draw rod system Fig. 10a: The centre tube of the bushing is used as current conductor.
Fig. 10d.
Bottom contacts with 4 or 6 threaded holes for cable lugs are available. The bottom contacts are made of copper and have rounded edges, so that they may be used without any shield for low insulation levels. At the level of the flange the draw rod is split into two parts. If required to meet the transport conditions, we can position a joint at any desired level below the flange. This must be stated in the order. The lower part with contact end shield can then be secured to the cover during transport and storage of the transformer. This system has been supplied by ABB since the seventies with an excellent service record and has the following advantages compared to other methods used for high currents:
Fig. 10a. Fig. 10b: The transformer leads are fitted with cable lugs, which are bolted to a bottom contact.
• 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 • •
Fig. 10b. Fig. 10c: This contact is drawn against the lower end of the bushing tube by a thin steel draw rod.
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 the lower end plate of the bushing.
Type of draw rod
GOE type BIL
GOE Cat. No.
GOE(2) Cat. No.
Lower draw rod 1)
250-2550
LF 170 059
LF 170 098
1)
250-2550
LF 170 057
LF 170 097
Upper draw rod
Table 21. Ordering particulars for draw rod system. 1)
2)
Fig. 10c. 16
Lower draw rod includes bottom contact, guiding cone and draw rod up to bushing flange level. Upper draw rod includes the complete draw rod above mounting flange level and the temperature compensation device.
∅150 D2
GOE
∅125 D2
GOE(2) Outer terminal
Outer terminal H2
H2
Threaded hole M8 for pulling wire
Threaded hole M8 for pulling wire
L2
L2 Mounting flange
Mounting flange M16 25
M16
60
L5
Additional joint on request H1 240
58 39
65 50 N1=4
Small bottom contact
N1 = Number of holes M12, equipped with thread insert with screw lock, depth 20, for cable lugs.
N1=6
Small N1=4 bottom contact
Large bottom contact
60
Additional joint on request
65 51 ∅125
25
L5 H1 110
65 51 N1=4
∅110
Fig. 10e. Draw rod system. For all currents up to rated current of the bushing. Selection as per Table 21.
17
goe_0033
Large bottom contact
Draw lead system GOE
GOE(2)
Suitable copper terminals for flexible draw leads are available for currents up to 1600 A. The terminal system consists of a two-part cable connector with a hole for brazing of the cable or cables. The two parts are screwed together in such a manner that normal tolerances in the cable and bushing lengths can be compensated. The connector is fastened by a hexagon nut to a copper plate placed at the top of the bushing. The GOE outer terminal stud is placed on top of this plate.
The terminal system is made in one piece for connection of a draw lead. The terminal is attached by means of a divided ring at the top of the centre tube. When mounting the outer terminal, the ring becomes locked.
D3 mm
Min. inner diam. D1 D9 of bushing mm mm
01) 15
35 35
38 38
30
35
38
40
45
48
01)
45
48
1)
Cond. Current, A area IEEE mm2 IEC
Complete inner terminal Cat. No.
Mass kg
50 95 150 285
205 390 615 1000
200 370 540 830
LF 170 056 -A -B
3.2 3.2
450 600 -
1300 1600 -
1100 1360 -
-C
3.2
-D
4.4
-E
4.4
Conductor area mm2
Current, A
D3 mm
IEC
01) 15 30 42
95 285 740
300 630 1300
1)
With pilot hole D=5
Table 22a. Inner terminal type GOE.
260 540 1110
LF 170 091 -A -B -C -D
1.1 1.0 0.9 0.7
With pilot hole D=5
GOE(2)
Outer terminal H2
Mass kg
Table 22b. Inner terminal type GOE(2).
∅150 D2
GOE
IEEE
Complete inner terminal Cat. No.
∅125 D2
Outer terminal
Threaded hole M8 for pulling wire
H2 Threaded hole M8 for pulling wire 53
L2 350
L2 End of cable
30 D9 D3
End of cable
D3 46
goe_0034
goe_0037
Fig. 11. Draw lead systems, LF 170 056 and LF 170 091. Selection as per Tables 22a and 22b.
18
Outer terminal The outer terminal consists of a cylindrical stud. The mounting arrangements are the same for all GOE bushings, regardless of size, current rating and internal connection system. Copper and aluminium studs are available.
Material
D2 mm
H2 mm
Max. rated current, A
Cat. No.
Mass kg
Al Cu Cu
60 60 96
125 125 115
2500 4000 5000
LF 170 073 -A -B -AA
3 8 11.6
The terminal stud assembly consists of a stud, a retainer ring, a gasket, bolts and washers. The electrical contact function and the sealing function are completely separated.
Table 23a. Outer terminal type GOE. Special outer terminals available on request.
The stud is first fastened to the bushing top with M10 bolts, which give the proper electrical contact. The contact surface is located inside the gasket and is thus well protected from corrosion. Finally, the retainer ring with the gasket is pressed against the stud by means of M8 bolts.
Material
D2 mm
H2 mm
Max. rated current, A
Cat. No.
Mass kg
Al Al Cu Cu Cu
30 60 30 40 60
125 125 125 125 125
1250 1600 1600 1600 1600
LF 170 090 -A -B -C -D -E
1.0 1.8 2.8 3.4 5.1
Table 23b. Outer terminal type GOE(2). Special outer terminals available on request.
19
End-shields The withstand voltages in a specific case depend upon many factors beyond control of the bushing manufacturer. Therefore the configurations and distances given below are only intended as guidelines.
Types GOE The maximum stresses in the oil at the surface of the shield insulation and the parts surrounding the bushing must be limited to those values normal for insulated conductors and other similar components in the same transformer.
ABB can also provide assistance with field calculations to confirm the compatibility between the transformer and our bushings. A mm
45°
1000
Rmin 5 60° Edges within this area should be rounded to Rmin=5 mm Earthed layer
500 Shield -X/-XP Shield -V/-VP A
R1
H6 H4 H5
Shield -U/-UP
D5 D4
No shield
0
R3
0 0
500
1000
500 1500
2000
(kV) U (kV) LI
U = Power frequency LI = Lightning impulse
R2
Fig. 13. Recommended minimum distance A for different shields and test voltages.
A = Distance to flat surface e.g. tank or core clamp
60° ø102 ø125
1000 2500
Shield mounted on the bushing Large bottom contact N1= 6
20° 60° Shield mounted on the draw rod bottom contact. (Not possible for small bottom contact with N1 = 4. See page 17.)
13 18
Fig. 12. Recommendations for positioning.
Fig. 14. Mounting alternatives.
Shield
To be used with GOE
Dimensions according to Fig. 12 (mm) D4 D5 H4 H5 H6 R1
R2
R3
Mass kg
Cat. No.
Epoxy insulated
Pressboard insulated 1)
U
250-1300
262
174
265
170
90
492
30
8
2.1
LF 170 046
-U
-UP
V X
1550-1800 2100-2550
352 420
207 230
365 420
240 290
120 125
351 533
24 44
10 25
2.5 3.2
LF 170 046 LF 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.
20
The withstand voltages in a specific case depend upon many factors beyond the control of the bushing manufacturer. Therefore the configurations and distances given below are only intended as guidelines.
Types GOE(2) The maximum stresses in the oil at the surface of the shield insulation and the parts surrounding the bushing must be limited to those values normal for insulated conductors and other similar components in the same transformer.
ABB can also provide assistance with field calculations to confirm the compatibility between the transformer and our bushings.
45°
Rmin 5
60° Edges within this area should be rounded to Rmin=5 mm Earthed layer
Shield mounted on the bushing Large bottom contact
A
H6
Shield mounted on the draw rod bottom contact. (Not possible for small bottom contact. See page 17.)
R1
H4 H5
Fig. 16. Mounting alternatives. R3 D5 D4
R2
A = Distance to flat surface e.g. tank or core clamp
60°
60° ø13
ø110 ø87 ø18
goe_0032
20°
Fig. 15. Recommendations for positioning.
To be used with GOE(2)
Dimensions according to Fig. 15 (mm) D4 D5 H4 H5 H6 R1
R2
R3
A
Mass kg
Cat. No.
1175 1425 1675
250 258 258
25 32 32
8 9 9
370 430 470
1.5 1.8 1.8
LF 170 092 -A LF 170 092 -K LF 170 092 -K
142 142 142
230 265 265
163 180 180
62 80 80
230 350 350
Epoxy insulated
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.
21
Pressboard insulated 1) -C -L -L
Ordering particulars When ordering please fill in the specification table below, or alternatively state the following: • Type and catalogue number for bushing. • Catalogue number for the outer terminal, or if a nonstandard terminal is requested: material, diameter D2 and height H2. • Specify draw rod or draw lead system. • If a draw rod system is chosen, the size of the bottom contact (small or large) must be specified. • If a draw lead system is chosen, the full catalogue number must be given. • Catalogue number for insulated shield. (A shield is recommended 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
Complete Designation
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, small contact (On request the lower part of the draw rod can be sent separately at an earlier delivery date.) 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, small contact (On request the lower part of the draw rod can be sent separately at an earlier delivery date.) Insulated shield: Pressboard coated, LF 170 046-VP Other requirements: Test voltage 690 kV Tan δ over C2
Transformer bushings, type GOE and GOE(2) Technical guide
This Technical Guide has been produced to allow transformer manufacturers, and their designers and engineers, access to all the technical information required to assist them in their selection of the appropriate Transformer Bushing. The Guide should be used in conjunction with the Selection Guide to allow the optimum selection to be made. The technical information pertaining to bushings manufactured by ABB has been divided into separate documents, with one document for each type. The information provided in this document is intended to be general and does not cover all possible applications. Any specific application not covered should be referred directly to ABB, or its authorized representative. ABB makes no warranty or representation and assumes no liability for the accuracy of the information in this document or for the use of such information. All information in this document is subject to change without notice.
2
Table of Contents Design _______________________ 4 GOE features _______________________ 5 GOE(2) features _____________________ 5 Shed form __________________________ 6
Testing _______________________ 6 Test tap ____________________________ 7 Test 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 ____________________ 15 Overload capacity of bushings __________ 15
Connection details______________ 16 Draw rod system _____________________ 16 Draw lead system ____________________ 18 Outer terminal _______________________ 19
End-shields ___________________ 20 GOE features _______________________ 20 GOE(2) features _____________________ 21
Ordering particulars ____________ 22
3
Design The GOE bushing is available in two designs: GOE and GOE(2). The bushing is built up around a centre tube on which the condenser body is wound. The condenser body is wound from insulating paper. For bushings up to 550 kV paper of full width is employed. Bushings for higher voltages are wound from paper strips in a manner similar to that used for cables.
The mounting flange is an aluminium alloy casting. The gasket surface is machined flat. On the flange there is a test tap. This tap is automatically earthed by a protective cap when the tap is not connected to external test or measuring circuits. The mounting flange and the top housing are protected by a two-component grey-blue paint.
The foils are located so that the best possible combination of external flashover and internal puncture strength is achieved.
The mounting flange can be equipped with extensions on the oil side, providing space for current transformers. Extension lengths 300 and 600 mm are available as standard, but other lengths can be quoted on request.
The upper insulator, which is made in one piece without gaskets, the lower insulator and the mounting flange are held between the end plates by the centre tube and sealing is accomplished by oil-resistant rubber gaskets in grooves.
The rated current is defined according to IEC 60137. It is valid only when the centre tube is used as conductor. For draw lead applications the permissible current will be lower.
For GOE 250 to 900 the top housing is equipped with two oil level gauges of prisma type. For GOE 1050 and larger, the top housing is equipped with a magnetic oil level indicator.
Bushings GOE 450 and larger require a shield at the oil end. The purpose of this shield is to avoid excessive electrical stresses in the oil at the lower end plate and at the connection between the insulated lead from the
Top end nut Top end nut
Set of springs
Sealing plug
Flexible connection
Top housing
Top housing Oil level gauge
Porcelain insulator, air side
Porcelain insulator, air side
Transformer oil
Sealing plug Oil level gauge
Pre-stressed tubes Transformer oil Condenser body Condenser body
Clamping ring Cemented flange
Mounting flange Extension for current transformers
Mounting flange Extension for current transformers
Porcelain insulator, oil side
Porcelain insulator, oil side
Bottom end nut
Bottom end nut
goe_0028
Fig. 1. Transformer bushings types GOE and GOE(2). 4
transformer winding and the draw lead or other conductors in the bushing. The maximum stresses in the oil at the surface of the shield insulation must be limited to those values normal for insulated conductors and similar components in the same transformer.
The bushing is designed to be mounted at an angle not exceeding 60° from the vertical. A higher inclination can be obtained on request. The current shall be reduced for horizontal mounting and up to 15° from horizontal. The top housing is made of aluminium and has expansion space for the oil, sufficient for temperature variations in the bushing between -40° and +80 °C. Variations in the length of the centre tube and the housing are compensated by a flexible connection inside the top housing.
ABB manufactures shields of this type, which are quoted for and delivered separately. The shields are made of aluminium and are insulated with epoxy or a lining of pressboard. The shield may be mounted on the lower end plate of the bushing, or on the bottom contact of the draw rod. Dimensions and recommendations, see pages 17, 20 and 21.
For GOE 1050 and larger, the upper insulator is fastened with an additional clamping ring to the mounting flange.
It is of great importance that the shield is placed in the right position in order to protect the bottom end of the bushing. Guidelines for positioning of the shield are given in Figs. 14 and 16. ABB can also provide assistance with field calculations to confirm the performance of other shielding systems.
GOE(2) features A set of springs in the top housing provides adequate pressure on all gaskets, independently of temperature and load conditions.
Quotations for modifications in design and additional parts such as special terminal studs, shields, rod gaps, etc., as well as special tests, are given on request.
The bushing is designed to be mounted at an angle not exceeding 30° from the vertical. The top housing has expansion space for the oil sufficient for temperature variations in the bushing between-40° and +80 °C. Variations in the lenght of the centre tube are compensated by the flexible cover of the housing.
GOE features A set of concentric tubes are prestressed and serve as springs which hold the main bushing components together and provide adequate pressure on the gaskets in all expected temperature and load conditions.
For GOE(2) the upper insulator is cemented to a flange which is bolted to the mounting flange.
The annular space formed between the tubes makes an efficient cooling duct for dissipation of the heat, thus improving the current-carrying capacity and thermal stability of the bushing.
5
Shed form The shed form for all GOE bushings is of the anti-fog type with alternating long and short sheds. GOE: For each pair of sheds the ratio between nominal creepage distance and the axial length is 3.43 and the ratio between protected and nominal creepage distance is 0.40.
GOE(2): For each pair of sheds the ratio between nominal creepage distance and the axial length is 3.94 and the ratio between protected and nominal creepage distance is 0.43. 66
65
51
36 R10
R10 R8
R8 R10 10°
R10
27.5
10°
18° R8
R5.5
10°
70
18° R8
10°
18° R5.5
31
R4.5
70
18° R4.5 goe_0029
Fig. 2. Shed form, GOE and GOE(2).
Testing During manufacture and on completion, each bushing is subjected to a number of routine tests, according to IEC 60137 or IEEE bushing standards. A tightness test is carried out on the assembled bushing after the final drying and impregnation. The test is made at an oil overpressure of 180 kPa (1.8 bar) for 12 hours at ambient temperature. No sign of leakage is allowed. The electrical routine test is carried out at room temperature with the lower end of the bushing submerged in oil. Capacitance and tan δ are measured in steps up to the power frequency withstand voltage, which is maintained for one minute.
one minute test. Measurements for detection of internal partial 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 always demonstrated that the PD value is below 5 pC at rated voltage (=√3 times bushing service voltage). Bushings with BIL level ≥ 850 kV are routine tested with a dry lightning impulse voltage withstand test, when tested according to IEC 60137. Type tests have been carried out according to both IEC 60137 and IEEE. Type test reports are available on request.
Capacitance and tan δ are also measured with decreasing voltage at the same voltage levels as before the
6
Test tap
Test tap adapter
All GOE bushings are equipped with a test tap connected to the outer layer of the condenser body. The max. test voltage of the tap is 20 kV, 50 Hz for one minute. The routine test voltage is 20 kV. Max. service voltage is 6 kV.
For permanent connection of the test tap to measuring circuits, a test tap adapter is required. Catalogue number 2769 522-C.
In connection with an external capacitance the test tap can be used as a voltage tap. The test tap has dimensions according to IEEE Potential tap type A.
(Pg 16 acc. to DIN 40430) Pr 22.5 Turnable in optional direction
goe_0019
Fig. 3. Test tap
Fig. 4. Test tap adapter.
Common specifications Application:
Transformers
Classification:
Oil impregnated paper, capacitance graded, outdoor immersed bushing
Ambient temperature:
+40 °C to -40 °C, minimum value acc. to temperature class 2 of IEC 60137.
Altitude of site:
< 1 000 m
Level of rain and humidity:
1-2 mm rain/min. horizontally and vertically, as per IEC 60060-1.
Pollution level:
According to specified creepage distance and IEC 60815 1).
Immersion medium:
Transformer oil. Maximum daily mean temperature 90 °C. Maximum temporary oil temperature 115 °C.
Oil level in transformer:
Not lower than 30 mm from the bushing flange.
Max. pressure of surrounding medium:
100 kPa over pressure.
Markings:
Conforming to IEC/ IEEE
For conditions exceeding the standard specification above, please consult ABB. 1) IEC 60815 "Guide for the selection of insulators in respect of polluted conditions."
7
GOE 250-210 to GOE 450-400 Nominal voltages 52 kV to 170 kV Lightning impulse 250 kV to 550 kV Rated current A
Flange extension
Creepage distance mm
D1 mm
L1±20 L2±25 L3 mm mm mm
L4 mm
L5±5 mm
Mass kg
-A/-AA -B/-AB -C/-AC -D/-AD
3150 3150 5000 5000
0.6 0.3 0.6 0.3
1425±40 -"-"-"-
48 48 38 38
550 -"-"-"-
1060 -"-"-"-
605 305 605 305
725 430 725 430
985 685 985 685
200 190 245 225
LF 121 052
-A/-AA -B/-AB -C/-AC -D/-AD
3150 3150 5000 5000
0.6 0.3 0.6 0.3
2380±65 -"-"-"-
48 48 38 38
825 -"-"-"-
1335 -"-"-"-
605 305 605 305
670 375 670 375
985 685 985 685
240 230 290 270
LF 121 053
-A/-AA -B/-AB -C/-AC -D/-AD
3150 3150 5000 5000
0.6 0.3 0.6 0.3
3355±90 -"-"-"-
48 48 38 38
1120 -"-"-"-
1630 -"-"-"-
605 305 605 305
630 320 630 320
985 685 985 685
275 265 330 315
Type GOE
Catalogue Number
Insulator colour Brown/Light grey
250-210
LF 121 051
380-300
450-400
Table 1. Dimensions GOE 250 - GOE 450 ∅300
Rating plate data 6 mounting holes ∅20
30°
Type GOE
M12
Rated voltage Um kV, RMS
250-210 52 380-300 123 450-400 170
Phaseto-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
52 84 123
250 450 550
210 300 400
120 185 260
Table 2. Electrical data GOE 250 - GOE 450 130 ∅350
Other data for information
∅386
Type GOE
Flange extension
Wet power frequency AC kV, RMS
Dry switching impulse kV, Peak
Nom. cap. between conductor and test tap (C1) C1±10% (pF)
250-210 380-300 450-400
0.6 / 0.3 0.6 / 0.3 0.6 / 0.3
120 170 240
400 550 650
810 / 594 594 / 448 543 / 423
L2 L1
Table 3. Electrical data GOE 250 - GOE 450
25 115 ∅224 L3
∅350
L4
Type GOE
Max. test load 1 min acc. to IEC 60137 (N)
Max. permitted load (N) in operation at mounting angle -30° -60° 0°
250-210 380-300 450-400
5700 5700 5000
2800 2800 2500
L5 Earthed layer D1
2300 2300 2000
1700 1700 1500
Table 4. Mechanical loading GOE 250 - GOE 450 Fig. 5. 8
GOE 650-500 to GOE 900-650 Nominal voltage 245 kV Lightning impulse 650 kV to 950 kV Type GOE
Catalogue Number
Insulator colour Brown/Light grey
Rated current A
Flange extension
Creepage distance mm
D1 mm
L1 mm
L2 mm
L3 mm
L4 mm
L5±5 mm
Mass kg
650-500
LF 121 054
-A/-AA -B/-AB -C/-AC -D/-AD
3150 3150 5000 5000
0.6 0.3 0.6 0.3
4045±105 -"-"-"-
48 48 38 38
1300±27 -"-"-"-
1810±33 -"-"-"-
605 305 605 305
700 400 700 400
1135 835 1135 835
340 320 400 380
900-650
LF 121 055
-A/-AA -B/-AB -C/-AC -D/-AD
3150 3150 5000 5000
0.6 0.3 0.6 0.3
5735±150 -"-"-"-
48 48 38 38
1800±37 -"-"-"-
2310±42 -"-"-"-
605 305 605 305
615 315 615 315
1135 835 1135 835
405 390 480 455
Table 5. Dimensions GOE 650 - GOE 900. (See also Technical Guide GOM, 1ZSE 2750-108.)
M12
∅350 Rating plate data
45°
Type GOE 8 mounting holes ∅20
Rated voltage Um kV, RMS
650-500 245 900-650 245
130 ∅350
Phaseto-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
155 170
650 950
500 650
325 395
Table 6. Electrical data GOE 650 - GOE 900 ∅386
Other data for information L2
Type GOE
Flange extension
Wet power frequency AC kV, RMS
Dry switching impulse kV, Peak
Nom. cap. between conductor and test 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
L1
Table 7. Electrical data GOE 650 - GOE 900
25 115 ∅264 L4 L5
L3
∅400
Type GOE
Max. test load 1 min Max. permitted load (N) acc. to IEC 60137 (N) in operation at mounting angle -30° -60° 0°
650-500 900-650
5700 5000
Earthed layer D1
2800 2500
2300 2000
1700 1500
Table 8. Mechanical loading GOE 650 - GOE 900
Fig. 6. 9
GOE 1050-750 to GOE 1425-1050 Nominal voltages 362 kV to 420 kV Lightning impulse 1050 kV to 1425 kV Type
Catalogue Number
Insulator Rated colour current Brown/Light grey A
Flange extension
Creepage distance mm
D1 mm
L1 mm
L3 mm
L4 mm
L5±5 mm
Mass kg
L2 mm
GOE 1050-750
LF 121 063
-A/-AA -B/-AB -C/-AC
2500 2500 2500
0.6 0.3 0
7205±185 -"-"-
48 48 48
2230±55 3070±60 605 305 -"-"-"-"5
655 390 90
1335 1035 735
775 755 730
GOE 1175-850
LF 121 061
-A/-AA -B/-AB -C/-AC -D/-AD -E/-AE -F/-AF
2500 2500 2500 5000 5000 5000
0.6 0.3 0 0.6 0.3 0
7955±205 -"-"-"-"-"-
48 48 48 38 38 38
2470±55 -"-"-"-"-"-
3310±60 -"-"-"-"-"-
605 305 5 605 305 5
610 335 35 610 335 35
1335 1035 735 1335 1035 735
830 810 785 935 910 875
GOE(2) 1175-850
LF 121 560
-A/-AA -B/-AB
1600 1600
0.6 0.3
9150±400 -"-
50 50
2540±4 -"-
3426±10 600 -"300
635 335
1225 925
580 565
GOE LF 121 071 1300-1050
-A/-AA -B/-AB
2500 2500
0.6 0.3
10290±265 -"-
48 48
3225±54 4065±59 605 305 -"-"-
620 320
1335 1035
1005 985
GOE LF 121 071 1300-1150
-C/-AC -D/-AD
2500 2500
0.6 0.3
11600±300 -"-
48 48
3620±56 4460±61 605 -"-"305
620 320
1335 1035
1055 1035
GOE(2) LF 121 570 1425-1050
-A/-AA -B/-AB
1600 1600
0.6 0.3
11750±350 -"-
50 50
3250±4 -"-
628 328
1390 1090
770 750
4136±10 600 -"300
Table 9. Dimensions GOE 1050 - GOE 1300
Rating plate data
Other data for information
Type
Rated voltage Um kV, RMS
Phaseto-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
Flange extension
Wet power frequency AC kV, RMS
Dry switching impulse kV, Peak
Nom. capacitance between conductor and test tap (C1) C1±10% (pF)
GOE 1050-750 GOE 1175-850 GOE(2) 1175-850 GOE 1300-1050 GOE 1300-1150 GOE(2) 1425-1050
362 362 362 420 420 420
220 220 220 245 245 243
1050 1175 1175 1425 1425 1425
750 850 850 1050 1175 1050
505 530 560 630 680 690
0.6 / 0.3 / 0 0.6 / 0.3 / 0 0.6 / 0.3 0.6 / 0.3 0.6 / 0.3 0.6 / 0.3
480 540 560 650 650 690
960 950 1030 1050 1175 1140
430 / 383 / 308 490 / 420 / 345 470 / 407 575 / 560 575 / 545 532 / 474
Table 10. Electrical data GOE 1050 - GOE 1300
Type
GOE 1050-750 GOE 1175-850 GOE(2) 1175-850 GOE 1300-1050 GOE 1300-1150 GOE(2) 1425-1050
Max. test load 1 min acc. to IEC 60137 (N)
Max. permitted load (N) in operation at mounting angle -30° -60° 0°
13000 12000 10000 10000 9000 10000
6500 6000 5000 5000 4500 5000
4300 4300 4400 3000 2500 4100
3100 3100 – 1500 – –
Table 12. Mechanical loading GOE 1050 - GOE 1300
10
Type
D6
D7
GOE(2) 1175-850 GOE(2) 1425-1050
450 500
400 450
Table 13. Dimensions GOE(2)
Test tap
45°
M12
30°
8 mounting holes ∅20
M12
12 mounting holes ∅23
D7 ∅430 150
158 ∅500
∅450
∅485
∅382
L2
L2
L1 L1
∅422
28 196 310 L4
L3
∅330 L4
L5
Earthed layer
25
∅480
L5 D1
L3
∅300
Earthed layer
D6 D1
goe_0030
Fig. 7a. Type GOE
Fig. 7b. Type GOE(2) 11
GOE 1550-1050 to GOE 1800-1300 Nominal voltage 550 kV Lightning impulse 1550 kV to 1800 kV Type
Catalogue Number
Insulator colour Brown/Light grey
Rated current A
Flange extension
Creepage distance mm
L1 mm
GOE 1550-1050
LF 121 072
-A/-AA -B/-AB -C/-AC
2500 2500 2500
0.6 0.3 0
10130±260 -"-"-
GOE 1675-1175
LF 121 073
-A/-AA -B/-AB -C/-AC
2500 2500 2500
0.6 0.3 0
GOE 1675-1300
LF 121 073
-D/-AD -E/-AE -F/-AF
2500 2500 2500
GOE(2) 1675-1300
LF 121 580
-A/-AA -B/-AB
GOE 1800-1300
LF 121 074
-A/-AA -B/-AB -C/-AC
L2 mm
L3 mm
L4 mm
L5±5 mm
Mass kg
3225±54 3965±59 -"-"-"-"-
605 305 5
655 355 55
1585 1285 985
1455 1420 1385
11700±300 -"-"-
3720±50 4460±55 -"-"-"-"-
605 305 5
630 330 30
1585 1285 985
1635 1600 1565
0.6 0.3 0
13380±330 -"-"-
4220±50 5260±55 -"-"-"-"-
605 305 5
610 310 10
1585 1285 985
1785 1750 1715
1600 1600
0.6 0.3
15200±350 -"-
4160±4 -"-
5046±10 -"-
600 300
639 339
1585 1285
1055 1020
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
Table 13. Dimensions GOE 1550 - GOE 1800
Rating plate data
Other data for information
Type
Rated voltage Um kV, RMS
Phaseto-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
Flange extension
Wet power frequency AC kV, RMS
Dry switching impulse kV, Peak
Nom. capacitance between conductor and test tap (C1) C1±10% (pF)
GOE 1550-1050 GOE 1675-1175 GOE 1675-1300 GOE(2) 1675-1300 GOE 1800-1300
550 550 550 550 550
318 318 318 318 318
1550 1675 1675 1675 1800
1050 1175 1300 1300 1300
750 750 750 750 800
0.6 / 0.3 / 0 0.6 / 0.3 / 0 0.6 / 0.3 / 0 0.6 / 0.3 0.6 / 0.3 / 0
660 730 790 750 800
1050 1300 1300 1410 1300
457 / 390 / 342 512 / 440 / 433 500 / 490 / 450 525 / 482 500 / 490 / 450
Table 14. Electrical data GOE 1550 - GOE 1800
Type
Max. test load 1 min acc. to IEC 60137 (N)
Max. permitted load (N) in operation at mounting angle -30° -60° 0°
GOE 1550-1050 GOE 1675-1175 GOE 1675-1300 GOE(2) 1675-1300 GOE 1800-1300
16000 16000 13000 10000 13000
8000 8000 6500 5000 6500
4700 4700 4300 3900 4300
2500 2500 1500 – 1500
Table 16. Mechanical loading GOE 1550 - GOE 1800
12
30°
Test tap
Position of test tap
30°
M12 12 mounting holes ∅23
M12
∅450
12 mounting holes ∅24 ∅660
158 ∅450 ∅600
∅382
150 ∅565
L2 L1
L2 L1
28 ∅462
196 L4
L5
310
∅428
L3
L4
Earthed layer ∅720
L5
25 L3
∅300
Earthed layer
∅500
∅48 ∅50 goe_0031
Fig. 8a. Type GOE
Fig. 8b. Type GOE(2) 13
GOE 2100-1425 to GOE 2550-1600 Nominal voltage 800 kV Lightning impulse 2100 kV to 2550 kV Type GOE
Catalogue Number
Insulator colour Brown/Light grey
Rated current A
Flange extension
Creepage distance mm
L1 mm
L2 mm
L3 mm
L4 mm
L5±5 mm
Mass kg
2100-1425 LF 121 081
-A/-AA -B/-AB
2500 2500
0.6 0.3
16630±420 -"-
5220±52 6265±57 -"-"-
605 305
710 410
1955 1655
2605 2555
2550-1550 LF 121 082
-A/-AA -B/-AB -C/-AC
2500 2500 2500
0.6 0.3 0
18320±460 -"-"-
5720±52 7065±57 -"-"-"-"-
605 305 5
640 340 40
1955 1655 1355
2760 2710 2650
2550-1600 LF 121 083
-A/-AA -B/-AB -C/-AC
2500 2500 2500
0.6 0.3 0
20000±500 -"-"-
6210±58 7555±63 -"-"-"-"-
605 305 5
640 340 40
1955 1655 1355
2915 2865 2805
Table 17. Dimensions GOE 2100 - GOE 2550
30°
Position of test tap
Rating plate data
∅711
M12 12 mounting holes ∅32
∅600
150
∅565
Type GOE
Rated voltage Um kV, RMS
Phaseto-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
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
2100-1425 2550-1550 2550-1600
0.6 / 0.3 900 0.6 / 0.3 / 0 950 0.6 / 0.3 / 0 1000
L2
L1
∅665
Wet power frequency AC kV, RMS
Dry switching impulse kV, Peak
Nom. cap. between conductor and test tap (C1) C1±10% (pF)
1550 1675 1760
600 / 575 574 / 522 / 476 600 / 550 / 506
Table 19. Electrical data GOE 2100 - GOE 2550
216 28 Type GOE L4
L5
L3 Earthed layer
∅528 ∅780
Max. test load 1 min Max. permitted load (N) acc. to IEC 60137 (N) in operation at mounting angle 0° -30° -60°
2100-1425 15700
7850
5400
3600
2550-1550 14000 2550-1600 13000
7000 6500
4400 3700
2500 1600
Table 20. Mechanical loading GOE 2100 - GOE 2550
∅48
Fig. 9. 14
Current capacity The rated currents specified in this catalogue are based on thermal tests and are in accordance with IEC 60137 and apply to the built-in conductors of the bushings. The GOE bushings conform to the requirements of IEC 60137 and IEEE for currents given in Table 25.
Overload capacity of bushings If the conductor for the bushing is selected with 120 % of the rated current of the transformer, the bushing is considered to be able to withstand overload conditions according to IEC 60354 without further clarification or tests. This recommendation complies with IEC 60137.
Short-time current The rated thermal short-time current (Ith), as defined in IEC 60137 clause 5, is listed in Table 25 for draw rod and fixed bottom end terminal. For draw lead of stranded copper with the area 100 mm2 the short-time current (Ith) 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 (Id) is 2.5 times the 1 second short-time current.
Rated current IEC A
Current IEEE A
Short-time Ith 1s kA
current Ith 2s kA
Dynamic current Id peak kA
1600 2500 3150 5000
1450 2100 2700 4250
100 100 100 100
75 100 100 100
250 250 250 250
Table 25. Rated current, short-time current and dynamic current as defined in IEC 60137, for draw rod and fixed bottom end terminal.
15
Connection details The oil side connection can be made with either a drawrod system or a draw-lead system. For the air side connection the same outer terminals are provided for both systems. When ordering, please specify the items stated below.
During installation on the transformer, the upper end of this rod is bolted to a spring device beneath the outer terminal, which consists of two concentric tubes of different materials and is so designed that it gives the required contact load at all temperatures.
Draw rod system Fig. 10a: The centre tube of the bushing is used as current conductor.
Fig. 10d.
Bottom contacts with 4 or 6 threaded holes for cable lugs are available. The bottom contacts are made of copper and have rounded edges, so that they may be used without any shield for low insulation levels. At the level of the flange the draw rod is split into two parts. If required to meet the transport conditions, we can position a joint at any desired level below the flange. This must be stated in the order. The lower part with contact end shield can then be secured to the cover during transport and storage of the transformer. This system has been supplied by ABB since the seventies with an excellent service record and has the following advantages compared to other methods used for high currents:
Fig. 10a. Fig. 10b: The transformer leads are fitted with cable lugs, which are bolted to a bottom contact.
• 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 • •
Fig. 10b. Fig. 10c: This contact is drawn against the lower end of the bushing tube by a thin steel draw rod.
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 the lower end plate of the bushing.
Type of draw rod
GOE type BIL
GOE Cat. No.
GOE(2) Cat. No.
Lower draw rod 1)
250-2550
LF 170 059
LF 170 098
1)
250-2550
LF 170 057
LF 170 097
Upper draw rod
Table 21. Ordering particulars for draw rod system. 1)
2)
Fig. 10c. 16
Lower draw rod includes bottom contact, guiding cone and draw rod up to bushing flange level. Upper draw rod includes the complete draw rod above mounting flange level and the temperature compensation device.
∅150 D2
GOE
∅125 D2
GOE(2) Outer terminal
Outer terminal H2
H2
Threaded hole M8 for pulling wire
Threaded hole M8 for pulling wire
L2
L2 Mounting flange
Mounting flange M16 25
M16
60
L5
Additional joint on request H1 240
58 39
65 50 N1=4
Small bottom contact
N1 = Number of holes M12, equipped with thread insert with screw lock, depth 20, for cable lugs.
N1=6
Small N1=4 bottom contact
Large bottom contact
60
Additional joint on request
65 51 ∅125
25
L5 H1 110
65 51 N1=4
∅110
Fig. 10e. Draw rod system. For all currents up to rated current of the bushing. Selection as per Table 21.
17
goe_0033
Large bottom contact
Draw lead system GOE
GOE(2)
Suitable copper terminals for flexible draw leads are available for currents up to 1600 A. The terminal system consists of a two-part cable connector with a hole for brazing of the cable or cables. The two parts are screwed together in such a manner that normal tolerances in the cable and bushing lengths can be compensated. The connector is fastened by a hexagon nut to a copper plate placed at the top of the bushing. The GOE outer terminal stud is placed on top of this plate.
The terminal system is made in one piece for connection of a draw lead. The terminal is attached by means of a divided ring at the top of the centre tube. When mounting the outer terminal, the ring becomes locked.
D3 mm
Min. inner diam. D1 D9 of bushing mm mm
01) 15
35 35
38 38
30
35
38
40
45
48
01)
45
48
1)
Cond. Current, A area IEEE mm2 IEC
Complete inner terminal Cat. No.
Mass kg
50 95 150 285
205 390 615 1000
200 370 540 830
LF 170 056 -A -B
3.2 3.2
450 600 -
1300 1600 -
1100 1360 -
-C
3.2
-D
4.4
-E
4.4
Conductor area mm2
Current, A
D3 mm
IEC
01) 15 30 42
95 285 740
300 630 1300
1)
With pilot hole D=5
Table 22a. Inner terminal type GOE.
260 540 1110
LF 170 091 -A -B -C -D
1.1 1.0 0.9 0.7
With pilot hole D=5
GOE(2)
Outer terminal H2
Mass kg
Table 22b. Inner terminal type GOE(2).
∅150 D2
GOE
IEEE
Complete inner terminal Cat. No.
∅125 D2
Outer terminal
Threaded hole M8 for pulling wire
H2 Threaded hole M8 for pulling wire 53
L2 350
L2 End of cable
30 D9 D3
End of cable
D3 46
goe_0034
goe_0037
Fig. 11. Draw lead systems, LF 170 056 and LF 170 091. Selection as per Tables 22a and 22b.
18
Outer terminal The outer terminal consists of a cylindrical stud. The mounting arrangements are the same for all GOE bushings, regardless of size, current rating and internal connection system. Copper and aluminium studs are available.
Material
D2 mm
H2 mm
Max. rated current, A
Cat. No.
Mass kg
Al Cu Cu
60 60 96
125 125 115
2500 4000 5000
LF 170 073 -A -B -AA
3 8 11.6
The terminal stud assembly consists of a stud, a retainer ring, a gasket, bolts and washers. The electrical contact function and the sealing function are completely separated.
Table 23a. Outer terminal type GOE. Special outer terminals available on request.
The stud is first fastened to the bushing top with M10 bolts, which give the proper electrical contact. The contact surface is located inside the gasket and is thus well protected from corrosion. Finally, the retainer ring with the gasket is pressed against the stud by means of M8 bolts.
Material
D2 mm
H2 mm
Max. rated current, A
Cat. No.
Mass kg
Al Al Cu Cu Cu
30 60 30 40 60
125 125 125 125 125
1250 1600 1600 1600 1600
LF 170 090 -A -B -C -D -E
1.0 1.8 2.8 3.4 5.1
Table 23b. Outer terminal type GOE(2). Special outer terminals available on request.
19
End-shields The withstand voltages in a specific case depend upon many factors beyond control of the bushing manufacturer. Therefore the configurations and distances given below are only intended as guidelines.
Types GOE The maximum stresses in the oil at the surface of the shield insulation and the parts surrounding the bushing must be limited to those values normal for insulated conductors and other similar components in the same transformer.
ABB can also provide assistance with field calculations to confirm the compatibility between the transformer and our bushings. A mm
45°
1000
Rmin 5 60° Edges within this area should be rounded to Rmin=5 mm Earthed layer
500 Shield -X/-XP Shield -V/-VP A
R1
H6 H4 H5
Shield -U/-UP
D5 D4
No shield
0
R3
0 0
500
1000
500 1500
2000
(kV) U (kV) LI
U = Power frequency LI = Lightning impulse
R2
Fig. 13. Recommended minimum distance A for different shields and test voltages.
A = Distance to flat surface e.g. tank or core clamp
60° ø102 ø125
1000 2500
Shield mounted on the bushing Large bottom contact N1= 6
20° 60° Shield mounted on the draw rod bottom contact. (Not possible for small bottom contact with N1 = 4. See page 17.)
13 18
Fig. 12. Recommendations for positioning.
Fig. 14. Mounting alternatives.
Shield
To be used with GOE
Dimensions according to Fig. 12 (mm) D4 D5 H4 H5 H6 R1
R2
R3
Mass kg
Cat. No.
Epoxy insulated
Pressboard insulated 1)
U
250-1300
262
174
265
170
90
492
30
8
2.1
LF 170 046
-U
-UP
V X
1550-1800 2100-2550
352 420
207 230
365 420
240 290
120 125
351 533
24 44
10 25
2.5 3.2
LF 170 046 LF 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.
20
The withstand voltages in a specific case depend upon many factors beyond the control of the bushing manufacturer. Therefore the configurations and distances given below are only intended as guidelines.
Types GOE(2) The maximum stresses in the oil at the surface of the shield insulation and the parts surrounding the bushing must be limited to those values normal for insulated conductors and other similar components in the same transformer.
ABB can also provide assistance with field calculations to confirm the compatibility between the transformer and our bushings.
45°
Rmin 5
60° Edges within this area should be rounded to Rmin=5 mm Earthed layer
Shield mounted on the bushing Large bottom contact
A
H6
Shield mounted on the draw rod bottom contact. (Not possible for small bottom contact. See page 17.)
R1
H4 H5
Fig. 16. Mounting alternatives. R3 D5 D4
R2
A = Distance to flat surface e.g. tank or core clamp
60°
60° ø13
ø110 ø87 ø18
goe_0032
20°
Fig. 15. Recommendations for positioning.
To be used with GOE(2)
Dimensions according to Fig. 15 (mm) D4 D5 H4 H5 H6 R1
R2
R3
A
Mass kg
Cat. No.
1175 1425 1675
250 258 258
25 32 32
8 9 9
370 430 470
1.5 1.8 1.8
LF 170 092 -A LF 170 092 -K LF 170 092 -K
142 142 142
230 265 265
163 180 180
62 80 80
230 350 350
Epoxy insulated
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.
21
Pressboard insulated 1) -C -L -L
Ordering particulars When ordering please fill in the specification table below, or alternatively state the following: • Type and catalogue number for bushing. • Catalogue number for the outer terminal, or if a nonstandard terminal is requested: material, diameter D2 and height H2. • Specify draw rod or draw lead system. • If a draw rod system is chosen, the size of the bottom contact (small or large) must be specified. • If a draw lead system is chosen, the full catalogue number must be given. • Catalogue number for insulated shield. (A shield is recommended 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
Complete Designation
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, small contact (On request the lower part of the draw rod can be sent separately at an earlier delivery date.) 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, small contact (On request the lower part of the draw rod can be sent separately at an earlier delivery date.) Insulated shield: Pressboard coated, LF 170 046-VP Other requirements: Test voltage 690 kV Tan δ over C2
