ABB GOE(2) User manual

1ZSC000563-ACF EN, REV. A, 2020-06-25
Transformer bushing, type GOE(2)
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
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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................................................................................................................................................................. 11
2.2.1  General specifications ............................................................................................................................................... 11
2.2.2  Mechanical loading.................................................................................................................................................... 11

3  Delivery 13
3  Incoming inspection..................................................................................................................................................................... 13
3.1  Transportation ............................................................................................................................................................................. 13
3.2  Storage........................................................................................................................................................................................ 13
3.3  Lifting........................................................................................................................................................................................... 14
3.3.1  Lifting the transport box............................................................................................................................................. 14
3.3.2  Lifting the bushing out of the transport box ............................................................................................................... 15

4  Installation 17
4.1  Tools ............................................................................................................................................................................................ 17
4.2  Consumables .............................................................................................................................................................................. 17
4.3  Preparations ................................................................................................................................................................................ 18
4.3.1  Installation of lifting tools ........................................................................................................................................... 18
4.3.2  Lifting the bushing for installation on the transformer................................................................................................ 20
4.4  Installation with draw lead ........................................................................................................................................................... 21
4.4.1  Installation with draw lead ......................................................................................................................................... 21
4.5  Installation with draw rod at transformer factory.......................................................................................................................... 25
4.5.1  Removal of the lower draw rod with bottom contact from the bushing ..................................................................... 25
4.5.2  Installation of the small bottom contact in the transformer ........................................................................................ 29
4.5.3  Installation of the large bottom contact in the transformer ........................................................................................ 30
4.5.4  Installation of the bushing on the transformer ........................................................................................................... 32
4.6  Installation with draw rod at site .................................................................................................................................................. 35
4.6.1  Preparations at site ................................................................................................................................................... 35
4.6.2  Installation of the bushing on the transformer at site................................................................................................. 38
4.7  Hydraulic tightening of the draw-rod nut...................................................................................................................................... 42
4.8  Manual tightening of the draw-rod nut......................................................................................................................................... 45
4.9  Minimum oil-level in transformer .................................................................................................................................................46
4.10  Installation of the outer terminal .................................................................................................................................................. 46
4.11  Grounding of the bushing flange ................................................................................................................................................. 49

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
5  Commissioning 51
5.1  Waiting time before energization ................................................................................................................................................. 51
5.2  Recommended test before energization ..................................................................................................................................... 52
5.2.1  Overview ................................................................................................................................................................... 52
5.2.2  Tightness test between transformer and bushing flange........................................................................................... 52
5.2.3  Tightness test of bushing outer terminal.................................................................................................................... 52
5.2.4  Measurement of capacitance and dissipation factor ................................................................................................. 53
5.2.5  Measurement of through-resistance.......................................................................................................................... 56

6  Maintenance 57
6.1  Recommended maintenance ...................................................................................................................................................... 57
6.2  Checking the oil-level .................................................................................................................................................................. 59
6.3  Taking oil samples ....................................................................................................................................................................... 60

7  Re-packing 63
7.1  Removal of the bushing from the transformer, draw rod ............................................................................................................. 63
7.2  Re-packing of the bushing........................................................................................................................................................... 67

8  Spare parts 69
8.1  Summary ..................................................................................................................................................................................... 69
8  Spare parts .................................................................................................................................................................................. 69
8  Special tools ................................................................................................................................................................................ 70

9  Disposal and environmental information 73
9.1  Overview ..................................................................................................................................................................................... 73
9.2  Disposal and recycling ................................................................................................................................................................73

10  References 75
10  Summary ..................................................................................................................................................................................... 75

11  Appendix 77
11.1  Measurement record ................................................................................................................................................................... 77

Installation and commissioning guide
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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.

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2 Product description
2.1 Design
Overview
The GOE(2) 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
G000378
9 Oil plug
26 Oil-level gauge
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
74 Lifting eye Ø 25 mm
78 End shield
79 Top end nut

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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
G004304
A Draw-lead system
B Draw-rod system with small bottom contact, N1 = 4
C Draw-rod system with large bottom contact, N1 = 4
2 Draw lead
32 Inner terminal
35 Draw rod
40 Small bottom contact, N1 = 4
41 Large bottom contact, N1 = 4

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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.
The bushing has draw rod with one upper joint (52), it is always locked with threadlocking fluid. All joints
must be locked with threadlocking fluid when the bushing is in operation at site.
G006404
39 Lower joint (at flange level).
52 Upper joint.
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.
* All unlocked threads must be locked with threadlocking fluid, when the bushing is installed at site.

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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.
G002993
3 O-ring
9 Oil plug for oil-filling if the test tap is used as power source.
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
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 30° from vertical.
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° – 30° 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.

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G000700
A. Maximum cantilever load at installation angle 0°
B. Maximum cantilever load at installation angle 30°
C. Maximum axial static load
D. 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°
GOE(2) 1175 10000 5000 4400 20000
GOE(2) 1425 10000 5000 4100 20000
GOE(2) 1550 10000 5000 3900 20000
GOE(2) 1675 10000 5000 3900 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.
G005081
3.4 Lifting
3.4.1 Lifting the transport box
Overview
G003077
8 Soft lifting slings
43 Center of gravity

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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
G000391
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.
G006405
5. Attach a soft lifting sling to the top end nut (79)
and then to the crane hook.
NOTE!
If the outer terminal is not installed,
please contact ABB.
G006423
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

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4 Installation
4.1 Tools
Tool Part number Note
Lifting tool 9760 668-C -
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 draw lead.
Torque wrench key for hexagon head
screws, head width 16 mm (M10) and 13
mm (M8).
- -
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 25 mm holes, for connection of
the soft lifting slings to the bushing
flange.
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 Installation of lifting tools
Overview
G001931
1 Lifting tool
30 Soft bedding, e.g. rubber mat or woodboard
31 Shackle
Procedure
1. Loosen the M8 bolts (24).
NOTE!
It is not necessary to remove the
M8 bolts.
G006900

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2. Remove the M10 bolts (6) and washers (7), and
then remove the outer terminal (5).
NOTE!
Keep the outer terminal (5),
washers (7) and bolts (6), they will be
used again.
G006855
3. If the bushing has the draw-lead system, remove
the divided ring (80) and the inner terminal (32).
G006854
4. Install the lifting tool (1), the M10 bolts (6) and the
washers (7).
NOTE!
Align the side of the lifting tool with the
oil-level guage (26).
G004721
Torque
40 ±4 Nm
End of instruction

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4.3.2 Lifting the bushing for installation on the transformer
Procedure
1. Make sure that the crane can lift the bushing. Refer to the net weight in the packing list.
2. Align the crane hook with the lifting tool (1) on the bushing.
3. Attach soft lifting slings (8) from the lifting holes,
through the lifting tool to the crane hook.
CAUTION!
Put soft bedding (30) under the bottom
end. The bottom end is made of soft
metal, and contact with the floor can
cause damage.
G005060
4. For installation of the bushing at a specific angle:
1. Attach soft lifting slings with a shackle (31)
on the flange and to the crane hook.
NOTE!
For installation with an inclined
angle, the bushing should be
mounted with the oil-level gauge
(26) downwards.
G005059
5. Carefully lift the bushing from the floor.
CAUTION!
Make sure that the bushing does not rotate.
6. Adjust the shackle (31) until the bushing flange has the same angle as the transformer flange.
7. Lift the bushing to a position above the transformer.
CAUTION!
Make sure that the bushing does not rotate.
8. Align the bushing with the hole in the transformer turret.
End of instruction