Insulation Fault Caused by Current Transformer Seal Failure

doi:10.11930/j.issn.1004-9649.202004018

Abstract

Abstract: Firstly, the insulation structures of oil-immersed current transformer (TA) and SF₆ TA are introduced. And then, the causes of TA insulation breakdowns are analyzed based on an investigation of the insulation faults of TAs occurring in several cases. It is concluded through further disintegration examination that the seal failure is the root cause for insulation fault. Lastly, operation recommendations and precautions are presented for seal failure caused by the metal expander leakage of oil-immersed TA and the rupture disc damage of SF₆ TA.

Key words: current transformer, metal expander, rupture discs, seal failure

LI Yuquan, KOU Xiaoshi, ZHANG Shaofeng, SHAO Yingbiao, ZHAO Yongfeng, ZHU Hua, ZHANG Yifan, ZHENG Hanbo. Insulation Fault Caused by Current Transformer Seal Failure[J]. Electric Power, 2020, 53(11): 147-153,174.

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URL: https://www.electricpower.com.cn/EN/10.11930/j.issn.1004-9649.202004018

https://www.electricpower.com.cn/EN/Y2020/V53/I11/147

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