10kV配电网单相接地故障电弧自熄特性的试验研究  

Experimental Research on Self-Extinction Behavior of Arc Caused by Single-Phase Earth Fault in 10kV Distribution Network

作　　者：颜湘莲[1] 陈维江[2] 贺子鸣[1] 张少军[3] 李庆余[1] 

机构地区：[1]中国电力科学研究院,北京市海淀区100192 [2]国网武汉高压研究院,湖北省武汉市430074 [3]廊坊供电公司,河北省廊坊市065000

出　　处：《电网技术》2008年第8期25-28,34,共5页Power System Technology

摘　　要：设计了研究10kV配电网单相接地故障电弧自熄特性的集中参数模拟试验回路,针对集中参数模拟回路和分布参数实际系统,对单相接地故障下的恢复电压峰值及其上升速度进行了数值仿真,分析了模拟回路与实际系统的等效性。为研究单相接地故障电弧的自熄特性,利用模拟试验回路,当单相接地电流为5～30A时,在中性点不接地、经消弧线圈接地、经消弧线圈并联电阻接地方式下,改变绝缘间隙距离,系统地进行了大量的燃弧试验,统计分析了电弧自熄概率,给出了消弧线圈补偿方式下的残流限值。试验结果为10kV配电网选择合适的中性点接地方式提供了科学依据。A simulation test circuit with lumped parameters is designed for the research on the characteristic of arc self-extinction caused by single-phase earth fault occurred in 10kV distribution network. In view of the difference between the simulation test circuit consisting of lumped parameters and the distributed parameters in actual system, numerical simulation of the peak values and rising rates of recovery voltage under single-phase earth fault is performed, and the equivalency between simulation test circuit and actual system is analyzed. To research the arc self-extinction characteristic caused by single-phase earth fault, using the designed simulation test circuit and by means of changing the spacing of isolation gap, a lot of arcing tests are systemically performed under the conditions of isolated neutral, neutral grounded via Peterson coil and neutral grounded via Peterson coil in parallel with resistance while the single-phase grounding current is in the range from 5A to 30A; the self-extinction probability are statistically analyzed, and the limit value of residual fault current under neutral compensated with Peterson coil is given. Test results are available for reference in choosing proper neutral grounding mode for 10kV distribution network.

关 键 词：10 KV配电网 单相接地故障 恢复电压 消弧线圈补偿方式 电弧自熄概率 

分 类 号：TM85[电气工程—高电压与绝缘技术]