中性点非有效接地系统单相接地故障仿真分析

Simulation and analysis for single-phase earthed fault in non-effectively grounded system

为了提取小电流接地系统单相接地时故障线路和非故障线路的零模暂态能量值,利用电磁暂态程序ATP建立了仿真模型,借助Matlab程序设计得到了相应的零模暂态能量值.同时综合考虑不同接地过渡电阻、不同故障距离、不同故障初相角以及间歇性接地故障等多个因素,对小电流接地系统的单相接地故障进行了大量仿真.仿真分析结果表明:基于零模暂态能量的故障选线方法检测灵敏度高,不仅适用于中性点不接地系统,而且适用于中性点经消弧线圈接地系统及间歇性接地故障.

Zero modal transient energy of single-phase to ground fault is used for the faulty line and the healthy line in non-effectively grounded system. The simulation model is established for electromagnetic transient program ATP. The zero modal transient energy can be obtained by de- signing Matlab program. Various factors, such as different ground fault resistance, fault distance, fault initial angle and intermittent fault, should be put into overall consideration. This paper gets the following conclusion： the sensitivity of detection method based on zero modal transient energy has high sensitivity. It is not only applicable to the isolated neutral system, but also adaptable to peterson coil grounded system and intermittent fault.