考虑线路阻抗的主动干预型熄弧装置应用分析  

Application Analysis of Active Intervention Type Arc-Extinguishing Device Considering Line Impedance

作　　者：朱文葛 李景禄[1] 易洲楠 刘洋 李必伟 ZHU Wenge;LI Jinglu;YI Zhounan;LIU Yang;LI Biwei(School of Electrical and Information Engineering,Changsha Universityof Science and Technology,Changsha 410114,China)

机构地区：[1]长沙理工大学电气与信息工程学院,长沙410114

出　　处：《电瓷避雷器》2021年第5期41-47,共7页Insulators and Surge Arresters

摘　　要：主动干预型熄弧装置具有良好的电压熄弧效果,但诸多文献进行原理分析时未考虑线路阻抗参数,需要进一步分析其处理电弧接地故障的性能。考虑故障线路阻抗参数,建立单相电弧接地故障时变电站内故障相进行金属性接地的等值电路,采用叠加原理疏导出故障点电流、变电站内接地点电流表达式,分析发现,故障点电流不仅与过渡电阻有关,还受到负载电流和线路阻抗的影响。理论分析了主动干预型熄弧装置熄弧性能和其存在的问题,发现在配电网重负载情况下且过渡电阻远大于线路阻抗时,采用主动干预型熄弧装置会增大故障点电流,促进电弧的燃烧。针对主动干预型熄弧装置存在人身、设备安全和熄弧障碍问题提出相应的解决措施。最后通过PSCAD/EMTD验证了本研究分析的结果。The active intervention type arc-extinguishing device has a good voltage extinguishing effect,but many of the literatures do not consider the line impedance parameters when performing the principle analysis, and further analysis of its performance in dealing with arc ground faults is needed. Considering the fault line impedance parameters, the equivalent circuit of metal grounding in the fault phase of the substation is established when the single-phase arc grounding fault occurs. The superposition principle is used to derive the expressions of the fault point current and the grounding point current in the substation. It is found that the fault point current is not only related to the transition resistance, it is also affected by the load current and line impedance. The arc extinguishing performance of active intervention arc-extinguishing device and its existing problems are analyzed theoretically. It is found that when the distribution network is under heavy load and the transition resistance is much larger than the line impedance, the active intervention type arc-extinguishing device will increase the fault point current and promote the burning of the arc. Aiming at the problems of human body, equipment safety and arc-extinguishing obstacles in the active intervention type arc-extinguishing device, corresponding solutions are proposed. Finally, the results of this study are verified by PSCAD/EMTD.

关 键 词：电弧接地 线路阻抗 熄弧 金属性接地 熄弧障碍 

分 类 号：TM862[电气工程—高电压与绝缘技术]