煤矿机电
煤礦機電
매광궤전
COLLIERY MECHANICAL & ELECTRICAL TECHNOLOGY
2012年
4期
101-103
,共3页
电压互感器%单相接地%事故分析
電壓互感器%單相接地%事故分析
전압호감기%단상접지%사고분석
voltage transformer%single phase grounding%accident analysis
举某矿井下10kV线路单相接地事故的实例，从接地保护及开口三角形绕组的工作原理着手。分析了发生接地事故的原因以及查找接地事故的方法。正常情况下，开口三角形绕组零序电压为0V；当系统单相接地，开口三角形绕组零序电压达到30V整定值时，零序电压继电器动作，发出接地信号。开口三角形绕组的错误接线会导致开口三角形环流，造成电压互感器烧损。将两组开口三角形绕组独立运行便可避免该事故的发生。
舉某礦井下10kV線路單相接地事故的實例，從接地保護及開口三角形繞組的工作原理著手。分析瞭髮生接地事故的原因以及查找接地事故的方法。正常情況下，開口三角形繞組零序電壓為0V；噹繫統單相接地，開口三角形繞組零序電壓達到30V整定值時，零序電壓繼電器動作，髮齣接地信號。開口三角形繞組的錯誤接線會導緻開口三角形環流，造成電壓互感器燒損。將兩組開口三角形繞組獨立運行便可避免該事故的髮生。
거모광정하10kV선로단상접지사고적실례，종접지보호급개구삼각형요조적공작원리착수。분석료발생접지사고적원인이급사조접지사고적방법。정상정황하，개구삼각형요조령서전압위0V；당계통단상접지，개구삼각형요조령서전압체도30V정정치시，령서전압계전기동작，발출접지신호。개구삼각형요조적착오접선회도치개구삼각형배류，조성전압호감기소손。장량조개구삼각형요조독립운행편가피면해사고적발생。
Takes one lO kV underground coal mine single grounding accident as the example, the reasons that lead grounding accident happen are analyzed from grounding protection and open-delta winding zero-sequence voltage working principle. Under normal circumstance, the open-delta winding zero sequence voltage is zero. When the system single grounding happens, the open-delta winding zero sequence voltage achieves 30 V, the zero sequence voltage relay sends grounding signal. This damage accident of voltage transformers is on account of wiring error, which causes voltage transformer burn down. If two groups open-delta winding units operate separately, which can avoid accident happen.
