Table of Contents
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5
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
6.1
Recommended maintenance ...................................................................................................................................................... 59
6.2
Checking the oil-level .................................................................................................................................................................. 61
6.3
Taking oil samples ....................................................................................................................................................................... 62
7
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
8.1
Summary ..................................................................................................................................................................................... 73
8.2
Spare parts .................................................................................................................................................................................. 73
8.3
Special tools ................................................................................................................................................................................ 75
9
9.1
Overview ..................................................................................................................................................................................... 79
9.2
Disposal and recycling ................................................................................................................................................................ 79
10
10.1
Summary ..................................................................................................................................................................................... 81
11
11.1
Measurement record ................................................................................................................................................................... 83
4
Installation and commissioning guide
1ZSC000563-AAF EN, REV. 4, 2021-06-23
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