双断口断路器并联电容对潜供电弧影响  

Influence of Parallel Capacitor of Circuit Breaker with Double-break on Secondary Arc

作　　者：肖智彬 孙秋芹[1] 刘浩 张永涛 罗宸江 XIAO Zhibin;SUN Qiuqin;LIU Hao;ZHANG Yongtao;LUO Chenjiang(School of Electrical and Information Engineering,Hunan University,Changsha 410082,China)

机构地区：[1]湖南大学电气与信息工程学院,长沙410082

出　　处：《电力系统及其自动化学报》2018年第10期117-123,共7页Proceedings of the CSU-EPSA

摘　　要：特高压输电系统发生单相瞬时接地故障,潜供电弧能否及时熄灭对于单相自动重合闸具有重要意义。采用等效电路法和向量分析,得出故障点潜供电流、恢复电压的表达式。利用EMTP仿真分析恢复电压上升率和潜供电弧熄灭时间,得出并联电容对于平缓上升率和缩短熄灭时间有一定作用,且两者下降趋势基本一致,有利于潜供电弧零休熄灭。进一步研究其他因素对恢复电压上升率的影响,结果表明:线路结合自身参数安装并联电容能使其达到最小值,通过仿真计算验证了理论分析的正确性。When a single-phase transient ground fault occurs in an ultra-high voltage(UHV)transmission system,the reliable extinction of secondary arc is of great significance to the single-phase auto-reclosing.The equations of secondary arc current at fault locations and the corresponding recovery voltages are formulated using equivalent circuit transform and vector analysis.The rate of the rise of recovery voltage(RRRV)and the arcing time are analyzed through EMTP simulations,and results indicate that the parallel capacitor is effective for flatting RRRV and shortening the arcing time;meanwhile,their decreasing trends agree basically,which is advantageous for the extinction of secondary arc.Moreover,the influences of other factors on RRRV are also studied,showing that when the parallel capacitor is connected to the system according to the parameters of lines,RRRV can reach its minimum.The correctness of theoretical analysis is verified by simulations.

关 键 词：特高压输电线路 双断口断路器 并联电容 潜供电弧 恢复电压上升率 

分 类 号：TM77[电气工程—电力系统及自动化]