单相接地故障负序选线方法的研究

Research of Fault Line Selection for Single Phase to Earth Fault in Networks with Negative Current

基于不对称故障时负序网络在单电源放射性网络的拓扑结构,研究了负序电流的相角变化规律。研究结果表明,在单电源放射性网络中,当网络中发生单相接地故障时,故障线路与非故障线路的负序电流相角相差趋于180°,以此选出在这类输电网络中发生单相接地故障时的故障线路。由于该方法需要判断的量仅有负序电流的相角,所以选线方法方便易行。大量仿真验证了方法的正确性和有效性。

The variation patterns of the phase angle of negative current were studied based on the negative sequence network in single power source radioactive network＇s topology. Study results showed that when asymmetric faults of single phase occurred in single power source radioactive network. The phase angle of negative sequence current between the fault line and the normal line tends 180. Based on the character of negative current in this kind of network, we can select the fault line. Because this method only needs to judge the phase angle of negative sequence current, so the selection method is easy to put into execution. The correctness and effectiveness of this method were verified by numerous simulations.