知识与财富的链接
应用瞬时值对称分量变换,可提取电压、电流故障分量的正序空间向量.推导了基于电压、电流故障分量的正序空间向量的故障方向判据.理论分析及仿真实验表明该方向元件可在较短的数据窗内做出故障方向判定,从而确定是否区内故障,大大缩短了变压器区内外故障判断时间,辅以快速涌流判据,可极大地提高切除各种情况下变压器内部故障的速度.
The transformation of the instantaneous value symmetry component applied,the positive sequence space vector of fault component of the voltage and current can be derived.This paper deduces the determinant criterion of the fault direction based on the positive sequence space vector.The algorithm is proved to determinate the fault direction in short data window by theory analysis and simulation experiment,then to determinate to be internal fault or not.The algorithm can shorten the time to judge internal fault or external fault greatly,and can enhance the velocity of clearing up all the internal fault assisted by fast inrush criterion.
