适用于同杆并架双回线路的零序距离保护研究

利用不同线路发生单相接地短路时,故障线路与非故障线路零序电流相位差值和故障位置的数学关系作为识别依据,提出适用于平行双回线路的零序距离保护新判据。新方法具有受两侧电源角度及受负荷、系统运行方式影响小的特点。大量ATP仿真试验证明,新方法对于双回线出现的单相接地故障具有足够的灵敏度。

Study on Double Lines Distance Relay Based on Zero Sequece Cmponents

A double lines distance relay based on the zero sequence components is presented.By study,we can know that when one-phase ground fault happens on the line,more far the fault location is from where relays place,more less is the difference between the two zero sequence currents,when one-phase ground fault happens on the other line,more far the fault location is from where relays place,more is the difference between the two zero sequence currents..So the line which the one-phase ground fault take place can be distingusted.It has the characteristics of fault component relays such as being immune to the load and the system operating mode and the zero sequence components required by the relay can be easily acquired and available for a long time.The theoretic analysis and ATP-EMTP simulation results show the distance relay has excellent performance in detecting one-phase ground fault for double lines.