A new distance relay based on a weighted recursive least-square algorithm

A new algorithm is presented for distance protection based on the weighted recursive least-square method. This approach operates directly on voltage and Current samples, without employing, as it usually happens, the phasor approach applied in the complex space. In comparison with other solutions, the algorithm is very robust and allows high speed in the fault localization on, both HV and MV systems. Capabilities and performances of the algorithm are properly analysed and discussed in the paper.