【摘要】 特高压平行双回线路可以使用高速接地开关(highspeed grounding switch,HSGS)熄灭瞬时性单相接地故障及双回线跨线故障产生的二次电弧。文章分析了使用HSGS降低潜供电流和恢复电压的效果,特高压双回线路中各种因素对其熄灭二次电弧的影响。结果表明,双回线跨线瞬时性故障比单相接地瞬时性故障的潜供电流和恢复电压大,线路长度、负荷电流都会影响潜供电流与恢复电压,HSGS单端闭合时不利于熄弧,较高的二次电弧电阻有助于快速熄弧。200 km及以下的特高压平行双回线路使用低电阻、双端快速闭合的HSGS可以有效熄灭二次电弧,使单相重合闸成功。更多还原

【Abstract】 Secondary arc caused by temporary single-phase earth fault and cross-line fault occurred in parallel double-circuit UHVAC transmission lines could be extinguished by high speed grounding switch(HSGS).The effects of reducing secondary arc current and recovery voltage by HSGS were analyzed,and the influences of various factors of double-circuit UHVAC transmission lines on the extinguishing of secondary arc were researched.Results of the analysis and the research showed that as for double-circuit transmission lines the secondary arc current and the recovery voltage of temporary cross-line fault were higher than those of temporary single-phase earth fault;both the length of transmission line and load current would influence secondary arc current and recovery voltage;it was disadvantageous to the extinguishing of secondary arc while HSGS was closed only at one terminal;and a higher secondary arc resistance contributed to fast arc extinguishing.Applying the HSGS,which was of low resistance and could be rapidly closed at both terminals,to the parallel double-circuit UHVAC transmission lines with length shorter than 200km,the secondary arc would be effectively extinguished to make the single-phase reclosure successful.更多还原