浙江电力
浙江電力
절강전력
ZHEJIANG ELECTRIC POWER
2014年
11期
66-68,72
,共4页
吴文联%刘岩水%徐建平%黄腾%黄涛
吳文聯%劉巖水%徐建平%黃騰%黃濤
오문련%류암수%서건평%황등%황도
差动保护%两点接地%干扰分析
差動保護%兩點接地%榦擾分析
차동보호%량점접지%간우분석
differential protection%two-point grounding%interference analysis
通过对一起220 kV主变差动保护RCS978异常跳闸的现场检查和差动电流波形分析，发现差动电流回路存在两点接地，在受外界干扰时造成了差动保护的误动。揭示电流回路两点接地对继电保护系统的危害，为主变保护异常跳闸特别是大电流试验端子引起的保护误动事故的处理分析提供借鉴。
通過對一起220 kV主變差動保護RCS978異常跳閘的現場檢查和差動電流波形分析，髮現差動電流迴路存在兩點接地，在受外界榦擾時造成瞭差動保護的誤動。揭示電流迴路兩點接地對繼電保護繫統的危害，為主變保護異常跳閘特彆是大電流試驗耑子引起的保護誤動事故的處理分析提供藉鑒。
통과대일기220 kV주변차동보호RCS978이상도갑적현장검사화차동전류파형분석，발현차동전류회로존재량점접지，재수외계간우시조성료차동보호적오동。게시전류회로량점접지대계전보호계통적위해，위주변보호이상도갑특별시대전류시험단자인기적보호오동사고적처리분석제공차감。
By field detection and analysis on differential current wave after abnormal tripping of differential protection RCS978 of 220 kV main transformer, it is founded that there is two-point grounding in differential current circuit, which results in misoperation of differential protection in case of external interference. The paper expounds harm of two-point grounding of current circuit to relaying protection system and hence pro-vides reference for handling and analysis of abnormal tripping of differential protection of main transformer, especially protection misoperation accident caused by large-current testing terminals.
