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
1ZSC000563-ACF EN, REV. A, 2020-06-25
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................................................................................................................................................................. 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

4Installation and commissioning guide
1ZSC000563-ACF EN, REV. A, 2020-06-25

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
1ZSC000563-ACF EN, REV. A, 2020-06-25
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.

6Installation and commissioning guide
1ZSC000563-ACF EN, REV. A, 2020-06-25
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
1ZSC000563-ACF EN, REV. A, 2020-06-25
7
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

8Installation and commissioning guide
1ZSC000563-ACF EN, REV. A, 2020-06-25
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

Installation and commissioning guide
1ZSC000563-ACF EN, REV. A, 2020-06-25
9
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.

10 Installation and commissioning guide
1ZSC000563-ACF EN, REV. A, 2020-06-25
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