CAJ | 학술논문

配电网在单相接地故障后,对健全线路及故障线路上故障点之后的部分,三相电流突变量大小相等、波形一致;而故障线路中故障点之前的部分不具有该特征。据此提出一种基于相电流突变量的配电网单相接地故障区段定位方法：在各线路出口及分支处安装接地故障检测装置,独立测量比较各相电流突变量,即可识别出故障区段,结合网络拓扑即可实现故障区段定位。给出了具体的故障定位流程和判据。仿真实验证明了该方法能正确、可靠地识别故障区段。所述方法原理简单,仅需测量电流,且具有自举性,有望应用于实际配电网中。
배전망재단상접지고장후,대건전선로급고장선로상고장점지후적부분,삼상전류돌변량대소상등、파형일치;이고장선로중고장점지전적부분불구유해특정。거차제출일충기우상전류돌변량적배전망단상접지고장구단정위방법：재각선로출구급분지처안장접지고장검측장치,독립측량비교각상전류돌변량,즉가식별출고장구단,결합망락탁복즉가실현고장구단정위。급출료구체적고장정위류정화판거。방진실험증명료해방법능정학、가고지식별고장구단。소술방법원리간단,부수측량전류,차구유자거성,유망응용우실제배전망중。
Analysis shows that when single-phase earth fault occurs in a distribution network,three-phase current fault components of a healthy line and that of fault line after the fault point have same size and waveform,but that of fault line before the fault point doesn＇t have this characteristic.A single-phase earth fault section location method in the distribution network based on phase current fault component is proposed,namely,earth fault detection devices are installed at exits and branches of every line,and each device independently measures and compares current fault components so as to identify the fault section.Then fault section location is implemented with the network topology.Specific fault location flow chart and criterions are also given.Simulation results show that this method can identify fault section correctly and reliably.In addition,this method has a simple operation principle,only needs to measure currents.It has a bootstrap characteristic,and is expected to be used in practical distribution network. This work is supported by National Natural Science Foundation of China（No.51037005）.