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In this technique the relay can detect the fault and can discriminate between internal and external fault without the need for communication links. That combines of both impedance based methods and traveling wave based methods has been developed and presented in this paper. The proposed method first determines whether the fault is backward or forward to the measured relay and then determines if the fault is grounded or ungrounded. Next, the impedance based method is used to identify the fault for ungrounded faulted. Finally the traveling wave method is used to detect the fault for grounded fault by using the ground and Ariel mode. The simulation results indicate a good accuracy and more security of the suggested protection scheme compared with others schemes with different types of faults, fault resistances and fault inception angles using MATLAB/SIMLINK simulation.

A NEW DISTANCE PROTECTION SCHEME BASED ON COMBINATION OF IMPEDANCE AND TRAVELLING WAVE MEASUREMENTS