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电网技术  2007 

新型数字线路电流差动保护原理及其应用

, PP. 74-81

Keywords: 线路保护,差动继电器,电容电流,电流互感器饱和,电流互感器断线

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Abstract:

提出了研究线路电流差动保护的新概念不局限于基尔霍夫定律,直接研究区内、外短路时线路两侧电流的关系。对于采样值突变量差动继电器,在以线路两侧电流为横、纵坐标的笛卡尔坐标系中研究;对于相电流突变量差动继电器,定义线路两侧电流的相量比,在电流复平面上研究;对于差动阻抗继电器,定义差动电压与差动电流的比,在阻抗复平面上研究。上述研究手段直观,得出的继电器动作区域性能优良,不需要补偿线路电容电流。

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