一种适用于低线间距的同杆双回线跨线故障等值算法  

An interline fault equivalent algorithm for common-tower double-transmission line with narrow line-to-line distance

作　　者：张海 黄少锋 

机构地区：[1]新能源电力系统国家重点实验室(华北电力大学),北京102206

出　　处：《电力系统保护与控制》2012年第20期56-61,共6页Power System Protection and Control

摘　　要：针对同杆双回线跨线故障解算复杂、难以定性分析,结合保护研究的定性分析要求,提出了一种基于故障等值化简的跨线故障算法。利用低线间距同杆双回线的相间互感与线间互感较为接近的特征,用互感均值将同杆模型简化,通过等值化简将跨线故障化简成虚拟单回线故障进行解算,将所得电气量代入原双回线系统解算出双回线各相线的故障电气量。通过算例将三种典型跨线故障的结果与ATP-EMTP仿真结果进行了对比,结果表明使用均互感参数的跨线故障等值计算方法是有效和实用的,利用低线间距同杆双回线模型能够正确反映出实际中大多数跨线故障的故障特征,大大简化计算过程。Interline fault of double circuit line on the same tower is difficult to calculate and qualitatively analyze. To solve the problems and meet the need for qualitative analysis in relay protection research, an interline fault algorithm based on equivalent fault simplification is presented. Based on the character that coupling of lines is similar to that of phases on common-tower parallel lines with narrow line-to-line distance, the parallel lines＇ model can be simplified using the average mutual inductance. Via equivalent simplification, the interline fault can be simplified to a virtual single-circuit-line fault form for calculation, and the achieved electric quantities can be used in the original network for calculating those of the parallel lines. And via comparing calculation results under new algorithm to those of ATP-EMTP simulation, it shows the new interline fault algorithm which uses the average mutual inductance is efficient and practical. And using the model of parallel-line with narrow line-to-line distance can correctly reflect most interline faults＇ characters in practice and bring a more simple calculation process.

关 键 词：同杆双回线 低线间距 跨线故障 均互感参数 等值化简 

分 类 号：TM773[电气工程—电力系统及自动化]