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
2
2.1
Design ......................................................................................................................................................................................... 7
2.2
Transformer testing ..................................................................................................................................................................... 10
2.3
Technical specifications ............................................................................................................................................................... 11
2.3.1
General specifications ............................................................................................................................................... 11
2.3.2
Mechanical loading.................................................................................................................................................... 12
3
3.1
Incoming inspection..................................................................................................................................................................... 15
3.2
Transportation ............................................................................................................................................................................. 15
3.3
Storage ........................................................................................................................................................................................ 15
3.4
Lifting ........................................................................................................................................................................................... 16
3.4.1
Lifting the transport box ............................................................................................................................................. 16
3.4.2
Lifting the bushing out of the transport box ............................................................................................................... 17
4
4.1
Tools ............................................................................................................................................................................................ 19
4.2
Consumables .............................................................................................................................................................................. 19
4.3
Installation with fixed bottom contact........................................................................................................................................... 20
4.3.1
Installation of lifting tools ........................................................................................................................................... 20
4.3.2
Installation with fixed bottom contact......................................................................................................................... 22
4.4
Preparations with draw rod.......................................................................................................................................................... 27
4.4.1
Removal of the outer terminal ................................................................................................................................... 27
4.4.2
Removal of the lower draw rod with bottom contact from the bushing ..................................................................... 28
4.4.3
Installation of the large bottom contact in the transformer ........................................................................................ 30
4.4.4
Lifting the bushing for installation on the transformer................................................................................................ 32
4.5
Installation with draw rod ............................................................................................................................................................. 33
4.5.1
Installation of the bushing on the transformer ........................................................................................................... 33
4.5.2
Manual tightening of the draw-rod nut ....................................................................................................................... 36
4.5.3
Hydraulic tightening of the draw-rod nut.................................................................................................................... 38
4.6
Oil-filling....................................................................................................................................................................................... 39
4.7
Installation of the outer terminal .................................................................................................................................................. 40
4.8
Grounding of the bushing flange ................................................................................................................................................. 44
5
5.1
Waiting time before energization ................................................................................................................................................. 47
5.2
Recommended tests before energization.................................................................................................................................... 47
5.2.1
Overview ................................................................................................................................................................... 47
5.2.2
Tightness test between transformer and bushing flange........................................................................................... 47
5.2.3
Measurement of capacitance and dissipation factor ................................................................................................. 48
5.2.4
Measurement of through-resistance.......................................................................................................................... 51
Installation and maintenance guide
1ZSC000563-AAB EN, REV. 6, 2019-09-12
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