ABB GOE Series User manual

2750 515-1 EN, REV. 14, 2020-06-26
Transformer bushing, type GOE 250 to 2550
Installation and commissioning guide

The information contained in this document may be subject to change without prior warning and should not be considered
as binding on ABB AB’s behalf. ABB AB accepts no liability for any errors that may appear in this document. ABB AB is
not liable for any damage resulting from the incorrect interpretation of this document. This document, or parts thereof, may
not be reproduced or copied without ABB AB’s consent. It may not be distributed to others, or used by unauthorized
parties. Any breaches to the above will be penalized with the support of applicable laws.

Installation and commissioning guide
2750 515-1 EN, REV. 14, 2020-06-26
3
Contents
1  Safety 5
1.1  Levels of safety risks ................................................................................................................................................................... 5
1.2  Hazardous working situations ..................................................................................................................................................... 6
1.3  Safety precautions....................................................................................................................................................................... 6
1.4  Competence level........................................................................................................................................................................ 6

2  Product description 7
2.1  Design ......................................................................................................................................................................................... 7
2.2  Technical specification................................................................................................................................................................. 12
2.2.1  General specifications ............................................................................................................................................... 12
2.2.2  Mechanical loading.................................................................................................................................................... 12

3  Delivery 15
3  Incoming inspection..................................................................................................................................................................... 15
3.1  Transportation ............................................................................................................................................................................. 15
3.2  Storage........................................................................................................................................................................................ 15
3.3  Lifting........................................................................................................................................................................................... 16
3.3.1  Lifting the transport box............................................................................................................................................. 16
3.3.2  Lifting the bushing out of the transport box ............................................................................................................... 17

4  Installation 19
4.1  Tools ............................................................................................................................................................................................ 19
4.2  Consumables .............................................................................................................................................................................. 19
4.3  Preparations ................................................................................................................................................................................ 20
4.3.1  Lifting the bushing ..................................................................................................................................................... 20
4.3.2  Oil-filling of the bushing for horizontal installation ..................................................................................................... 22
4.4  Horizontal installation of the bushing on the transformer ............................................................................................................24
4.5  Installation with draw lead ........................................................................................................................................................... 26
4.5.1  Calculation of the length of the draw lead ................................................................................................................. 26
4.5.2  Installation with draw lead ......................................................................................................................................... 27
4.6  Installation with draw rod at transformer factory.......................................................................................................................... 32
4.6.1  Removal of the lower draw rod with bottom contact from the bushing ..................................................................... 32
4.6.2  Installation of the small bottom contact (N1=4) in the transformer ............................................................................ 35
4.6.3  Installation of the large bottom contact (N1=6) in the transformer ............................................................................37
4.6.4  Installation of the bushing on the transformer ........................................................................................................... 39
4.7  Installation with draw rod at site .................................................................................................................................................. 43
4.7.1  Preparations at site ................................................................................................................................................... 43
4.7.2  Installation of the bushing on the transformer at site................................................................................................. 46
4.8  Hydraulic tightening of the draw-rod nut...................................................................................................................................... 49
4.9  Manual tightening of the draw-rod nut......................................................................................................................................... 53
4.10  Minimum oil-level in transformer ................................................................................................................................................. 55
4.11  Installation of the outer terminal .................................................................................................................................................. 55
4.12  Grounding of the bushing flange ................................................................................................................................................. 58

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
5  Commissioning 61
5.1  Waiting time before energization ................................................................................................................................................. 61
5.2  Recommended test before energization ..................................................................................................................................... 62
5.2.1  Overview ................................................................................................................................................................... 62
5.2.2  Tightness test between transformer and bushing flange........................................................................................... 62
5.2.3  Tightness test of bushing outer terminal.................................................................................................................... 62
5.2.4  Measurement of capacitance and dissipation factor ................................................................................................. 63
5.2.5  Measurement of through-resistance.......................................................................................................................... 66

6  Maintenance 67
6.1  Recommended maintenance ...................................................................................................................................................... 67
6.2  Checking the oil-level .................................................................................................................................................................. 69
6.3  Taking oil samples ....................................................................................................................................................................... 70

7  Re-packing 73
7.1  Removal of the bushing from the transformer, draw rod ............................................................................................................. 73
7.2  Removal of horizontally installed bushings ................................................................................................................................. 76
7.3  Re-packing of the bushing........................................................................................................................................................... 78

8  Spare parts and special tools 79
8.1  Summary ..................................................................................................................................................................................... 79
8  Spare parts .................................................................................................................................................................................. 79
8  Special tools ................................................................................................................................................................................ 81

9  Disposal and environmental information 83
9.1  Overview ..................................................................................................................................................................................... 83
9.2  Disposal and recycling ................................................................................................................................................................83

10  References 85
10  Summary ..................................................................................................................................................................................... 85

11  Appendix 87
11.1  Measurement record ................................................................................................................................................................... 87

Installation and commissioning guide
2750 515-1 EN, REV. 14, 2020-06-26
5
1 Safety
1.1 Levels of safety risks
Throughout the manual, various types of safety risks are indicated. The most serious level on this scale
provides a warning about serious personal injury or possible death, or major damage to a product, if the
instructions are not observed.
Symbols and their meanings
The following describes the symbols that appear in the manual, along with their meaning.
DANGER!
The yellow, filled warning triangle warns that an accident will occur if the instructions are not
complied with and that it will result in serious personal injury or death and/or major damage to the
product.
It is used, for example, to warn of such dangers as: contact with high voltage, explosion or fire
risk, risk for toxic gases, risk of crushing, impacts, falls from high places, etc.
CAUTION!
The round warning symbol warns that an accident could occur if the instructions are not observed,
and that this could result in personal injury and/or damage to the product.
It is also used to warn of risks that entail burns, eye or skin injuries, impaired hearing, crushing or
slipping injuries, tripping, impacts, falls from high places, etc.
In addition, it is used to warn of functional requirements when assembling or removing equipment
where there is a risk of damage to the product or downtime.
NOTE!
The comment symbol identifies important information and conditions. Also used to indicate any
danger that could lead to property damage.
Torque
The torque symbol indicates tightening torque.

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1.2 Hazardous working situations
Hazard Action
Working close to high voltage. Disconnect all plant power. Ground all objects at the workplace.
If work must be done close to live plant components, make sure that
the safety distance is in compliance with the applicable safety
regulations.
Working on ladders and platforms. Work must be done in accordance with the applicable safety
regulations.
Do not use ladders or platforms in poor weather conditions.
Working with heavy objects. Do not walk under lifted objects.
Make sure that heavy objects are stable before starting work.
1.3 Safety precautions
Precaution Action
Transformer oil Collect used transformer oil in drums.
Transformer oil is dangerous. Fumes from hot oil can cause irritation
to the respiratory organs and the eyes. Long and repeated contact
with transformer oil can cause damage to your skin.
Waste and cleaning up Clean up liquid waste with an adsorbent. Treat waste as hazardous
to the environment.
Fire Extinguish fires with powder, foam or carbon dioxide.
1.4 Competence level
Installation of the bushing should only be performed by authorized personnel.
CAUTION!
Incorrect installation can lead to catastrophic failure of the transformer.

Installation and commissioning guide
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2 Product description
2.1 Design
Overview
The GOE is a capacitance graded oil impregnated paper bushing made for immersed oil/air service.
For a detailed description, please refer to the Technical guide, 1ZSE 2750-105.
General schematics
G006916
9 Oil plug
25 Sight glass, GOE 250 to 950
26 Oil-level gauge, GOE 1050 to 2550
51 Oil sampling valve ¼”
65 Mounting flange
68 Top housing
69 Porcelain insulator, air side
70 Test tap
71 Extension for current transformer
72 Porcelain insulator, oil side
73 Bottom nut
74 Lifting eye

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Terminal system
The bushing can be configured with one of two terminal systems: the draw-lead system, or the draw-rod
system.
The draw-rod system can be configured with a small, or a large bottom contact.
Terminal system Option
Draw-lead system -
Draw-rod system Small bottom contact
Large bottom contact
G004488
A Draw-lead system
B Draw-rod system with small bottom contact, N1 = 4
C Draw-rod system with large bottom contact, N1 = 6
2 Draw lead
32 Inner terminal
35 Draw rod
40 Small bottom contact, N1 = 4
41 Large bottom contact, N1 = 6

Installation and commissioning guide
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Draw-rod system
The draw rod can be configured with an optional joint (53) to fit transformers with short bushing turrets.
The bottom-contact joint (56) is locked with threadlocking fluid as standard.
Large bushings with long draw rods have one or two upper joints (52), they are always locked with
threadlocking fluid. All joints must be locked with threadlocking fluid when the bushing is in operation
at site.
G006279
39 Lower joint (at flange level).
52 Upper joint (only on large bushings)..
53 Additional joint (option).
54 Thread is locked with threadlocking fluid.
55 Thread is NOT locked with threadlocking fluid.*
56 Bottom-contact joint, locked with threadlocking fluid. Unlocked as option.*
* All unlocked threads must be locked with threadlocking fluid, when the bushing is installed at site.

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Horizontal installation
CAUTION!
Do not install bushings that does not have the oil passage (42) in the horizontal position.
If the bushing will be installed in the horizontal position, then this must be specified in the order. Because
horizontally installed bushings must be fully filled with oil (there is no expansion space for the oil), the oil
must flow freely to and from the transformer tank through an oil passage (42).
The bushing is delivered with expansion space for the oil, and the bushing must be filled at installation.
When the bushing is delivered, the oil passage (42) is covered with a covering plate (27) and a rubber gasket.
This configuration makes sure that it will be removed at installation on the transformer.
G004983
Type Dimension A (mm)
GOE 250 - GOE 450 55
GOE 550 - GOE 950 60
GOE 1050 - GOE 1175 67

Installation and commissioning guide
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Test tap
The bushing has a test tap that is connected to the outermost conductive layer of the condenser core. The test
tap is used to measure the bushing insulation by capacitance and dissipation factor. The cover connects the
outermost conductive layer to ground, and must always be installed when the bushing is energized.
The maximum one minute test voltage for this test tap is 20 kVrms. The test tap can be used as a power
source, if it is connected to an external capacitance. The operating voltage is limited to 6 kV.
CAUTION!
Do not energize the bushing without a test adapter or the cover installed. The bushing is grounded
through the cover to prevent damage to the bushing.
G006914
3 O-ring
57 Stud
58 Cover
59 Grounding spring
Test adapter, 2769 522-C, optional equipment
The test adapter 2769 522-C is available for permanent connection to measuring circuits. Please refer to Test
adapter – Technical guide 1ZSC000563-ACS and Installation and maintenance guide 1ZSC000563-ACD.
G003049

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2.2 Technical specification
2.2.1 General specifications
Refer to the table for the standard technical specifications of the bushing. For conditions exceeding the
specifications, please contact ABB.
Application: Transformers/reactors
Classification: Transformer bushing
• Oil impregnated paper, capacitance graded, oil immersed.
• For outdoor and indoor use.
Ambient temperature limits: -40 °C to +40 °C, limit temperatures.
Maximum altitude of site: 1000 m (Bushings for other altitudes can be provided on
request.)
Level of rain and humidity: 1-2 mm rain/minute horizontally and vertically, according to
IEC 60060-1 and IEEE Std 4.
Maximum pollution level: According to the specific creepage distance, and IEC 60815.
Immersion medium: Transformer oil.
• Maximum daily mean oil temperature: +90 °C.
• Maximum temporary oil temperature, at short time
overload: +115 °C.
Oil-level in transformer: Not lower than 30 mm from the bushing flange.
Maximum pressure of medium: pg100 kPa (pg= relative to ambient pressure).
Angle of installation: 0° to 60° from vertical.
(GOE 1300, 1425 and 2550-1675 0° to 30°.)
Test tap: Test tap with 8 mm male contact pin.
According to IEEE type A.
Conductor: Center-tube conductor, or draw lead.
Markings: Conforming to IEC/IEEE.
2.2.2 Mechanical loading
Maximum permitted static load on the outer terminal
The load must be applied below the midpoint of the outer terminal. The total cantilever load must be
perpendicular to the bushing axis. The bushing installation angle can be 0° – 60° from vertical.
Only bushings that are specified for horizontal installation can be installed at 90° from vertical.
In the axial direction, the bushing can withstand a static load of 20 kN.
NOTE!
The loads described in this section are static loads, for dynamic loads such as earthquakes and
extreme wheather conditions, please contact your ABB sales representative.

Installation and commissioning guide
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G001888
A. Maximum cantilever load at installation angle 0°
B. Maximum cantilever load at installation angle 30°
C. Maximum cantilever load at installation angle 60°
D. Maximum axial static load
E. Load applied at the midpoint

Type Test load 1
minute (N)
Maximum cantilever load in operation at
installation angle (N)
Maximum
axial static
load (N)
0° 30° 60°
GOE 250, 380, 650 5700 2800 2300 1700 20000
GOE 950 5000 2500 2000 1500 20000
GOE 1050 13000 6500 4300 3100 20000
GOE 1175 12000 6000 4300 3100 20000
GOE 1300, 1425 9000 4500 2500 - 20000
GOE 1550, 1675,
1800
13000 6500 4300 1500 20000
GOE 2550 - 1600 13000 6500 3700 1600 20000
GOE 2550 - 1675 12200 6100 2900 - 20000
Maximum permitted torque on the outer terminal
The maximum torque that is permitted on the outer terminal is 250 Nm.

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3 Delivery
3.1 Incoming inspection
• Make sure that all items have been delivered, refer to the packing list.
• Carefully inspect the bushings for shipping damage.
NOTE!
The bushing has been routine tested in oil, and there can be small quantities of oil remaining on
the oil-side of the bushing. Vaseline is used for lubrication of threads, and at some temperatures
Vaseline can appear as oil.
NOTE!
The oil-level is not shown correctly when the bushing is in the horizontal position.
3.2 Transportation
• The bushing must be transported in the transport box.
• The bushing must be transported in the horizontal position.
• Carefully inspect the bushing for damage after transportation.
3.3 Storage
Short term storage, less than 6 months
• The bushing can be stored outdoors, if it is in the transport box.
• Keep the transport box protected from water, when the bushing is stored outdoors.
• Keep the bushing dry, clean and protected against mechanical damage.
• The bushing can be stored in both the vertical, and horizontal positions.
NOTE!
The oil-level is not shown correctly when the bushing is in the horizontal position.

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Long term storage, more than 6 months
• The bushing can be stored outdoors, if it is in the transport box.
Keep the transport box protected from water, when the bushing is stored outdoors.
• Keep the bushing dry, clean and protected against mechanical damage.
• Lift the bushing to the vertical position with the top end upwards, and put it in a safe stand.
– As an alternative: keep the bushing in the transport box and lift it to an inclined position, with the
top end upwards and at an angle of at least 7°.
The bushing is delivered from ABB in a transport box, and the bushing is held in place by support blocks and
fiberboard in the box.
The transport box is marked with Top end, this identifies the end to lift when the bushing is in storage.
G005075
3.4 Lifting
3.4.1 Lifting the transport box
Overview
G003042
8 Soft lifting slings
43 Center of gravity

Installation and commissioning guide
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Procedure
1. Make sure that the crane and the soft lifting slings are approved for the total weight of the transport
box and bushing. Refer to the weight in the packing list.
2. Attach soft lifting slings (8).
3. Make sure that the angle of the soft lifting sling is not more than 20°.
4. Carefully lift the transport box.
5. Set down the transport box on a flat surface.
End of instruction
3.4.2 Lifting the bushing out of the transport box
Overview
G005004
79 Top end nut
Procedure
1. Make sure that the crane is approved for lifting the weight of the bushing. Refer to the net weight on
the packing list.
2. Open the transport box.
NOTE!
The cover is attached with bolts.

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3. Remove the support blocks from the transport box and put them on the ground.
CAUTION!
Make sure that the ground is flat.
4. Attach a soft lifting sling to the lower part of the
flange and then to the crane hook.
G004688
5. Attach a soft lifting sling to the top part of the
bushing and the lower part of the outer terminal
(5).
CAUTION!
Attach the soft lifting sling as close to
the top housing as possible, or damage
will occur.
NOTE!
If the outer terminal is not installed,
please contact ABB.
G004689
6. Carefully lift the bushing.
7. Make sure that the support blocks are in the same positions as the support blocks in the
transport box.
CAUTION!
Do not apply force to the ceramic insulator, it will break.
8. Lower the bushing onto the support blocks.
End of instruction

Installation and commissioning guide
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4 Installation
4.1 Tools
Tool Part number Note
Lifting tool 9760 668-A -
Soft bedding - E.g. rubber mat or wood board
Soft lifting slings - -
Pull-through cord 9760 669-A With M8 terminal.
For assembly and disassembly of the
draw rod and inner terminal.
Torque wrench key for hex socket
screws, 16 mm (M10) and 13 mm (M8),
torque 20 to 40 Nm.
- -
Wrench for hexagon head screws 45 mm
or adjustable wrench for 45 mm bolts
or larger.
- For the test tap cover.
Shackles - To fit Ø 28 mm holes, for standard GOE
bushings and Ø 50 mm for special GOE
bushings.
Hydraulic jack 9769 897-A For removal, and installation of the
bottom contact. Draw-rod system.
Box spanner 9760 669-B For removal, and installation of the
bottom contact. Draw-rod system.
Tackle - For installation of the bushing at a
specific angle.
4.2 Consumables
Item Brand ABB part
number
Note
Oil based Vaseline Fuchs - For treatment of contact surfases. Does
not react with transformer oil.
Mobilgrease 28 MOBIL - Lubricates and protects metals against
corrosion. Protects rubber. Does not
react with transformer oil.
Molykote Multilub Dow Corning - For lubrication of draw-rod threads and
bolts on the outer terminal.
Thread-locking fluid
grade 42
- - High strength thread-locking fluid,
permanent locking.
Thread-locking activator
grade 47
- - Activator for thread-locking fluid
grade 42.

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4.3 Preparations
4.3.1 Lifting the bushing
Overview
G005005
1 Lifting tool
30 Soft bedding, e.g. rubber mat or woodboard
31 Shackle
Procedure
1. Make sure that the crane can lift the bushing. Refer to net weight in the packing list.
2. Loosen the M8 bolts (24).
NOTE!
It is not necessary to remove the M8
bolts.
G004684