基于零序电流有功分量的配电网接地故障定位

Active Component of Zero sequence Current based Single phase Ground Fault Location in Distribution Grid

摘要:

为解决数字化环境下中性点经消弧线圈并、串电阻接地系统的单相接地故障区段定位问题，对此类系统中出现单相接地故障时电网内全部线路首端保护装置可测得的零序电流进行了分析，并给出了零序电流有功分量的一般分布规律.在此基础上结合配电网故障定位的一般矩阵算法，提出了基于零序电流有功分量的配电网单相接地故障区段定位算法，并遵循IEC61850标准创建了故障定位算法的逻辑节点与逻辑设备，为小电流接地故障定位系统的设备模型建立提供了参考.基于PSCAD/EMTDC软件的配网典型故障仿真结果验证了单相接地故障定位算法的准确性.

Abstract:

In order to solve the fault section location problem of single phase to ground fault in digitalized distribution grid with arc suppression coil in parallel/series with resistance, the fault zero sequence currents measured by protection devices installed at the head ends of all sections in such distribution grid are formulated, and the general distribution regularities of the active component of zero sequence current are provided. On this basis, the zero sequence active component based single phase to ground fault section location method is proposed with the combination of general matrix algorithm for fault location in distribution grid. Moreover, the corresponding logic node and logic device is newly developed according to IEC61850, which provides reference to the device model construction of fault section location system of single phase to ground fault in compensated network. The correctness of the proposed algorithm is verified by the simulation results of several typical faults in a distribution grid model built in PSCAD/EMTDC.