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电网技术  2011 

不同电压等级同塔多回输电线路零序功率方向元件动作行为分析

, PP. 235-242

Keywords: 同塔多回输电线路,零序互感,零序功率方向元件,跨线故障,复故障

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Abstract:

不同电压等级同塔多回输电线路故障类型复杂多样,线路间的零序互感会影响零序功率方向元件的动作性能。以不同电压等级同塔四回线路为例,分析了单回线路故障、同一电压等级线路跨线故障、不同电压等级线路跨线故障及不同电压等级线路复故障时零序功率方向元件的动作行为。对于不同电压等级同塔多回输电线路,分析不同电压等级跨线故障后零序功率方向元件的动作行为时,可以将其分解为若干个相同电压等级线路故障分别进行处理。理论分析表明,零序互感对零序功率方向元件的主要影响为,非故障线路处于强磁弱电条件时,零序功率方向元件会发生误动作。在此基础上,利用RTDS仿真软件对一1000kV/500kV同塔四回线路进行了仿真,结果证明了理论分析的正确性。

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