An algorithm for distance protection based on the change of the voltage phase angle

Conventional distance protection methods usually require additional filtering of the input signals to remove influence DC component and distortion sinusoidal signals. The paper shows an algorithm that does not proposed uses measured voltages at beginning line auxiliary as were calculated from currents known parameters. compares instantaneous values detects a fault on based change in phase angle voltage. Testing presented was performed with obtained computer simulations faults recordings devices real network. results confirmed represents fast sensitive transmission lines.