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电网技术  2014 

基于分布参数输电线路距离保护及低中高电阻短路故障识别

DOI: 10.13335/j.1000-3673.pst.2014.01.041, PP. 262-268

Keywords: 分布参数,故障情况识别,距离保护

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Abstract:

采用分布参数建模,利用保护安装处测量电压和测量电流,实时计算故障点电压,根据保护安装处到故障点的电压降与故障距离呈双曲正切函数关系,求解故障线路阻抗。该保护方法适用于单相接地和相间故障距离保护。该方法在算法设计中考虑了故障点电压的影响,原理上消除了负荷电流和过渡电阻对保护动作性能的影响,比传统保护具有更好动作性能,同时实现低、中、高电阻短路故障情况有效判别。EMTDC仿真和现场录波数据测试验证了该方法正确性和有效性。

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