摘要
提出一种新的适用于中性点不接地或非直接接地配电系统的接地故障检测算法。该方法是基于故障时由暂态电压和暂态电流计算而得到的暂态阻抗,然后根据暂态阻抗计算出的接地电容来实现接地故障的检测。利用M at-lab/S imu link仿真,模拟了3种不同故障条件下的仿真过程,验证了该方法的可行性。最后阐述了测量误差减小的方法以及判定故障整定值的确定。
A new algorithm of earth fault detection is proposed which is suitable for neutral point unearthed or indirectly earthed distribution system.This method is based on transient impedance which is calculated by transient voltage and transient current.Then the detection of earth fault is realized using earth capacitance calculated based on transient impedance.The simulation process is under three different fault conditions by using Matlab/Simulink.The results prove that the method is feasible.At last,a method is proposed to overcome the errors and the setting is determined if the feeder is faulted or not.
出处
《四川电力技术》
2011年第1期46-48,55,共4页
Sichuan Electric Power Technology
关键词
配电系统
暂态阻抗
接地电容
接地故障
distribution system
transient impedance
earth capacitance
earth fault
