A High Speed Distance Relaying Algorithm Based on a Least Square Error Method

최소자승법을 이용한 고속 거리계전 알고리즘

A high speed digital distance relaying algorithm based on a modified least square error method is proposed. To obtain stable phasor values very Quickly, first, a lowpass filter which has very short transient period and no overshoot is used. Secondly, the conventional least square error method is modified to the one having the data window of 3 samples by applying a FIR filter which removes the DC-offset component in current relaying signals.