HGIS限流串联电抗器对线路过电压的影响分析  

Impact Analysis of PHGIS Current-limiting Series Reactor on Line Overvoltage

作　　者：王一 单金华 张淦锋 陈旭 WANG Yi;SHAN Jinhua;ZHANG Ganfeng;CHEN Xu(State Grid Zhejiang Maintenance Branch Company,Hangzhou 311232,China)

机构地区：[1]国网浙江省电力有限公司检修分公司,杭州311232

出　　处：《浙江电力》2020年第7期13-17,共5页Zhejiang Electric Power

摘　　要：针对HGIS(混合式气体绝缘封闭组合电器)限流串联电抗器在特定运行方式下导致线路三相电压异常偏高的现象,分析了HGIS串联电抗器由热备用转冷备用时对线路电压的影响,发现其中两相电压是由于系统电容分压引起的正常偏高,另一相则是由于PT(电压互感器)与GIS(气体绝缘封闭组合电器)对地电容间的并联铁磁谐振引起的过电压。通过对PT解体检查验证了铁磁谐振的存在,最后给出了防止此类过电压的针对性预控措施。HGIS(hybrid gas-insulated switchgear) current-limiting reactor may lead to a surge of three-phase voltage in lines under certain operating conditions. The paper analyzes the impact of HGIS transition on line voltage from hot backup to cool backup. It is found that the two-phase voltage surge comes from capacitance subvoltage and the last overvoltage from the paralleled ferromagnetic resonance between ground capacitances between PT(potential transformer) and GIS(gas-insulated switchgear). The existence of ferromagnetic resonance is proved by PT disassembly check and countermeasures against such voltage are proposed.

关 键 词：串联电抗器 电压互感器 铁磁谐振 电容分压 

分 类 号：TM75[电气工程—电力系统及自动化]