高压电器2012，Vol.48Issue(4)：111-114,4.
CVT二次侧两点接地的事故分析
Analysis on the Two-point Earthing Faults of CVT Secondary Side
刘永 1陈昊 2熊斌1
作者信息
- 1. 江苏省电力公司检修分公司徐州分部,徐州221000
- 2. 江苏省电力公司检修分公司南京分部,南京210000
- 折叠
摘要
Abstract
It is specified in the regulations that the secondary circuit in PT can have one point grounded. Besides that earthing by zinc oxide varistor in switch yard is often applied in practice.In this paper, based on the analysis on the protection mis-operation induced by the broken down of zinc oxide vaistor in the secondary circuit of CVT, it is found in terms of wave ananlysis that when the zinc oxide varistor is broken down, two points will be grounded, and the protections will receive wrong voltage value, which will lead to protection mis-operation or protection refusal-operation. Finally, the suggestions for eliminating the corresponding potential dangers are provided.关键词
电压互感器/两点接地/氧化锌阀片/保护误动/开口三角Key words
voltage transformer/ two-point earthing fault/ ZnO varistor/ protection mis-operation/open-delta分类
信息技术与安全科学引用本文复制引用
刘永,陈昊,熊斌..CVT二次侧两点接地的事故分析[J].高压电器,2012,48(4):111-114,4.
