一种10 kV配电网的相间短路故障定位方法

An Interphase Short Circuit Fault Location Method of 10 kV Distribution Network

针对当配电网线路相间短路故障点前存在分支负荷时,阻抗法难以准确定位的问题,提出二次定位算法以减小相间短路故障定位的误差。首先,对阻抗法原理进行分析,对故障类型进行判别。然后,通过一次定位算法对故障点进行定位,当故障点前存在分支负荷时,结合线路拓扑结构对一次定位结果进行修正。最后,通过算例分析,对二次定位算法的可行性及准确性进行了检验。研究结果表明:故障距离在20 km内时,二次定位算法的定位误差小于1 km,误差率小于10%,定位精度高,具有良好的工程实用性。

In view of the problem that when there was a branch load before interphase short-circuiting fault point in the distribution network line,the result of impedance legal position had large deviation,a secondary positioning algorithm was put forward to reduce the position error of the phase-phase short circuit faultly.Firstly,the fault types were identified by analyzing the principle of impedance method.Then,the fault point was located by the one-time location algorithm.When there was branch load before the fault point,the fault result was corrected by combining with the line topology.Lastly,the feasibility and accuracy of secondary position algorithm were analyzed by calculation example.The reslts show that when the fault distance is within 20 km,the positioning error of the secondary positioning algorithrn is less than 1 km,and the error rate is less than 10%.The positioning accuracy is high and has good engineering practicability.