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Installation and commissioning guide
1ZSC000563-AAF EN, REV. 4, 2021-06-23
5 Commissioning 53
5.1 Waiting time before energization ................................................................................................................................................. 53
5.2 Recommended test before energization ..................................................................................................................................... 54
5.2.1 Overview ................................................................................................................................................................... 54
5.2.2 Tightness test between transformer and bushing flange........................................................................................... 54
5.2.3 Tightness test of bushing outer terminal.................................................................................................................... 54
5.2.4 Measurement of capacitance and dissipation factor ................................................................................................. 55
5.2.5 Measurement of through-resistance.......................................................................................................................... 58
6 Maintenance 59
6.1 Recommended maintenance ...................................................................................................................................................... 59
6.2 Checking the oil-level .................................................................................................................................................................. 61
6.3 Taking oil samples ....................................................................................................................................................................... 62
7 Re-packing 65
7.1 Removal of the bushing from the transformer, draw rod ............................................................................................................. 65
7.2 Removal of the bushing from the transformer, fixed bottom contact ...........................................................................................68
7.3 Re-packing of the bushing........................................................................................................................................................... 71
8 Spare parts and special tools 73
8.1 Summary ..................................................................................................................................................................................... 73
8.2 Spare parts.................................................................................................................................................................................. 73
8.3 Special tools ................................................................................................................................................................................ 75
9 Disposal and environmental information 79
9.1 Overview ..................................................................................................................................................................................... 79
9.2 Disposal and recycling ................................................................................................................................................................ 79
10 References 81
10.1 Summary ..................................................................................................................................................................................... 81
11 Appendix 83
11.1 Measurement record ................................................................................................................................................................... 83
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