煤矿电网电压互感器故障的PSCAD仿真研究  

The Fault of Potential Transformer Simulations Based on PSCAD for Coal Mine

作　　者：刘建华[1] 徐敏[1] 贾娜[1] 张磊[1] 王崇林[1] 

机构地区：[1]中国矿业大学信电学院,221008

出　　处：《电气应用》2008年第12期76-80,共5页Electrotechnical Application

摘　　要：在煤矿电网中,由于单相接地故障而引起的母线电压互感器(TV)烧毁的现象时有发生。依据电网单相接地故障时的等效模型仿真了TV一次电流的暂态特性,推导出引发TV故障的主要原因是煤矿电网单相接地时电容电流值较大。利用电力系统仿真软件PSCAD/EMTDC对一组6 kV TV进行仿真,并比较了TV一次侧经非线性电阻(消谐器)接地、开口三角并电阻和系统中性点经消弧线圈接地三种解决措施,得出中性点经消弧线圈接地是解决煤矿电网中此问题的最适合方法。The phenomenon of potential transformer burning out occurs occasionally in coal mine power network because of the single-phase grounding fault. According to the equivalent model of single-phase grounding fault for power network, the transient characteristics of the primary side current of TV is simulated, and it is deduced that the main reason for the TV fault is the high single phase-to-ground capacitive current in coal mine power network. A group of 6 kV potential transformers are simulated by PSCAD/EMTDC, and three solution methods are compared including connecting a nonlinear resistance to the neutral point of high voltage side of three-phase TV, connecting a damping resistance to the broken delta connection of the secondary assistant windings, and the neutral point grounding through the arc suppression coil. It is concluded that the neutral point grounding by arc suppression coil is the best solution in coal mine power network.

关 键 词：煤矿电网 电压互感器故障 消弧线圈 中性点不接地系统 PSCAD/EMTDC 

分 类 号：TM451[电气工程—电器]