西北330kV线路弱电强磁问题的分析及采取的措施  

Analysis on the weak current and strong magnetic problem of north-west 330 kV lines and its countermeasure

作　　者：宋国兵[1] 刘志良[1] 粟小华[2] 张健康[1,2] 索南加乐[1] 

机构地区：[1]西安交通大学电气工程学院,陕西西安710049 [2]西北电力调度通信中心,陕西西安710048

出　　处：《电力系统保护与控制》2010年第20期121-125,共5页Power System Protection and Control

基　　金：国家自然科学基金项目(50677051)~~

摘　　要：分析了一起发生在西北330kV线路中由线间零序互感影响而导致的纵联零序方向保护误动事件。分别从理论和定量的不同角度,深入分析了网络结构和纵联零序方向保护误动之间的联系,总结了双回线不同运行情况下纵联零序方向保护的动作行为,指出弱电强磁的网络联系是保护误动的原因,两侧零序电压反相是保护误动的必要条件。针对这种弱电强磁问题,提出采用基于故障类型的零序方向元件替代零序方向元件的解决措施,录波数据的分析结果证明了这种方法的有效性和准确性。This paper analyzes a maloperation event of longitudinal zero-sequence protection in north-west 330 kV lines,caused by zero-sequence mutual inductance between lines.By deeply analyzing the link between power network structure and maloperation of longitudinal zero-sequence protection from theoretical analysis and quantitative analysis,it sums up behaviors of longitudinal zero-sequence protection under different running situations of double-circuit lines,concludes that the reason for maloperation of protection is weak current and strong magnetic contact of lines,and points out that the necessary condition for maloperation is the reverse of zero-sequence voltage on both sides.In order to solve the weak current and strong magnetic problem,zero-sequence direction components based on fault type are used instead of zero-sequence direction components.Recording data analysis proves the effectiveness and accuracy of this measure.

关 键 词：弱电强磁 纵联零序方向 零序互感 方向元件 

分 类 号：TM773[电气工程—电力系统及自动化]