Table of Contents
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Contents
1
1.1
Levels of safety risks ................................................................................................................................................................... 5
1.2
Hazardous working situations ..................................................................................................................................................... 6
1.3
Safety precautions....................................................................................................................................................................... 6
1.4
Competence level........................................................................................................................................................................ 6
2
2.1
Design ......................................................................................................................................................................................... 7
2.2
Technical specification................................................................................................................................................................. 12
2.2.1
General specifications ............................................................................................................................................... 12
2.2.2
Mechanical loading.................................................................................................................................................... 12
3
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
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
Installation and commissioning guide
2750 515-1 EN, REV. 14, 2020-06-26
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