电工电气
電工電氣
전공전기
ELECTROTECHNICS ELECTRIC
2014年
4期
41-42,59
,共3页
杨宇峰%张鸿国%尤灵伟%范伟健
楊宇峰%張鴻國%尤靈偉%範偉健
양우봉%장홍국%우령위%범위건
电流互感器%直流电阻试验%励磁特性试验%匝间短路%开路运行%过电压
電流互感器%直流電阻試驗%勵磁特性試驗%匝間短路%開路運行%過電壓
전류호감기%직류전조시험%려자특성시험%잡간단로%개로운행%과전압
current transformer%DC resistance test%excitation magnetic characteristic test%short circuit between winding turns%open cir-cuit operation%overvoltage
针对电流互感器(CT)运行中出现的一例零序保护动作事故及开关柜内二次端子局部烧熔现象，采用直流电阻试验和励磁特性试验对事故原因进行分析，发现 CT 二次绕组线圈匝间短路是引起零序电流保护动作的直接原因，而运行中 CT 间歇性开路可能是造成 CT 二次绕组匝间短路和端子烧熔的原因所在。
針對電流互感器(CT)運行中齣現的一例零序保護動作事故及開關櫃內二次耑子跼部燒鎔現象，採用直流電阻試驗和勵磁特性試驗對事故原因進行分析，髮現 CT 二次繞組線圈匝間短路是引起零序電流保護動作的直接原因，而運行中 CT 間歇性開路可能是造成 CT 二次繞組匝間短路和耑子燒鎔的原因所在。
침대전류호감기(CT)운행중출현적일례령서보호동작사고급개관거내이차단자국부소용현상，채용직류전조시험화려자특성시험대사고원인진행분석，발현 CT 이차요조선권잡간단로시인기령서전류보호동작적직접원인，이운행중 CT 간헐성개로가능시조성 CT 이차요조잡간단로화단자소용적원인소재。
Aiming at that a case of zero sequence protective action fault turned up in operational current transformer(CT) and the switchgear in-ternal secondary terminal partial burnt out, this paper adopted DC resistance test and excitation magnetic characteristic test to carry out fault cause analysis, finding that short circuit of CT between secondary winding turns was the direct cause to lead to zero sequence current protective action, moreover the interval open circuit of CT in operation may be the cause to result in short circuit of CT between secondary winding turns and termi-nals burning-out.
