摘要
提出了一种距离保护新算法来解决双回线跨线接地故障下的故障测距问题。该算法通过六序分量法分析同杆双回线跨线故障模型,相邻线路的零序电流可通过保护安装处的零序电流结合双回线的故障特性求得,以此消除线路耦合的影响。据此,实现了基于单端单回线电气量的距离保护方法。仿真结果表明,所提出的算法在发生金属性跨线接地故障时能准确计算出故障阻抗,优于现有基于单端单回线的距离保护算法。
A novel distance protection algorithm for first-zone distance relay of parallel transmission lines was proposed for cross-country ground faults.The algorithm calculates the fault impedance using one-end sampling voltages and currents from single-line.The theoretical basis of the proposed algorithm was described,which is based on the six-sequence component method for parallel lines.In addition,an attempt was made to express the zero-sequence current of the adjacent parallel line at relay location by the zero-sequence current of the concerned line in combination with the fault characteristics of the system model,by which the impact of the mutual coupling between the lines can be eliminated.Thus,the distance algorithm for cross-country ground faults was presented.The simulations show that the proposed algorithm can obtain the accurate fault reactance when cross-country bolted faults occur,which is superior to the existing distance protection algorithm based on one-end data from single-line.
出处
《中国电机工程学报》
EI
CSCD
北大核心
2013年第7期131-138,9,共8页
Proceedings of the CSEE
基金
国家重点基础研究发展计划项目(973项目)(2012CB215206)
高等学校学科创新引智计划资助(B08013)~~
关键词
跨线接地故障
距离保护
同杆双回线
六序分量
电力系统
cross-country ground faults
distance relaying algorithm
parallel transmission lines
six-sequence component
power system
