Installation and commissioning guide
1ZSC000563-AAF EN, REV. 4, 2021-06-23
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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 specifications............................................................................................................................................................... 10
2.2.1 General specifications ............................................................................................................................................... 10
2.2.2 Mechanical loading.................................................................................................................................................... 11
3 Delivery 13
3.1 Incoming inspection..................................................................................................................................................................... 13
3.2 Transportation ............................................................................................................................................................................. 13
3.3 Storage........................................................................................................................................................................................ 13
3.4 Lifting........................................................................................................................................................................................... 14
3.4.1 Lifting the transport box............................................................................................................................................. 14
3.4.2 Lifting the bushing out of the transport box ............................................................................................................... 15
4 Installation 19
4.1 Tools ............................................................................................................................................................................................ 19
4.2 Consumables .............................................................................................................................................................................. 19
4.3 Preparations ................................................................................................................................................................................ 20
4.3.1 Installation of lifting tools ........................................................................................................................................... 20
4.3.2 Lifting the bushing for installation on the transformer................................................................................................ 22
4.4 Installation at the transformer factory .......................................................................................................................................... 24
4.4.1 Removal of the lower draw rod with bottom contact from the bushing ..................................................................... 24
4.4.2 Installation of the small bottom contact (N1=4) in the transformer ............................................................................ 27
4.4.3 Installation of the large bottom contact (N1=6) in the transformer ............................................................................ 29
4.4.4 Installation of the bushing on the transformer ........................................................................................................... 31
4.4.5 Installation of the bushing with the fixed bottom contact ........................................................................................... 34
4.5 Installation at site......................................................................................................................................................................... 36
4.5.1 Preparations at site ................................................................................................................................................... 36
4.5.2 Installation of the bushing on the transformer at site................................................................................................. 39
4.5.3 Installation of the bushing with the fixed bottom contact ........................................................................................... 34
4.6 Hydraulic tightening of the draw-rod nut...................................................................................................................................... 45
4.7 Minimum oil-level in transformer ................................................................................................................................................. 49
4.8 Installation of the outer terminal .................................................................................................................................................. 49
4.9 Grounding of the bushing flange ................................................................................................................................................. 52
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