同塔线路接地距离保护测量阻抗特性分析  

Measured Impedance Characteristic Analysis of Grounding Distance Protection Applied in Double/Multi-circuit Transmission Lines

作　　者：曾耿晖[1,2] 蔡泽祥[1] 刘为雄[3] 陈桥平 

机构地区：[1]华南理工大学电力学院,广东广州510640 [2]广东省电力调度通信中心,广东广州510600 [3]广东省电力设计研究院,广东广州510635

出　　处：《广东电力》2010年第10期24-28,79,共6页Guangdong Electric Power

摘　　要：针对同塔双回或多回并架输电线路给接地距离保护带来的新问题,通过分析同塔线路在并列运行、一端分裂运行、两端分裂运行等不同结构,两端系统发生强弱变化以及在不同接线结构和运行方式下线路发生故障时接地距离保护的测量阻抗,得出了同塔双回线路对接地距离保护影响的基本规律,即平行线路零序电流影响故障线路保护测量阻抗的规律,并证明该规律可以指导同塔线路接地距离保护的整定计算及安全性评价。The increase of double/multi-circuit transmission lines brings new problems on grounding distance protection.Upon analyzing measured impedance of grounding distance protection during faults of double/multi-circuit transmission lines with different power network structures and operating modes,the basic rule about influence of parallel-line zero-sequence current on measured impedance of protection during line faults is proposed,which has important significance for setting coordination and safety analysis about grounding distance protection applied in double/multi-circuit transmission lines.

关 键 词：同塔线路 距离保护 测量阻抗 安全性 

分 类 号：TM773[电气工程—电力系统及自动化]