Impedance correction method of distance relay on high voltage transmission line

A distance protection relay plays a major role in faults detection in the electric transmission line. The fault resistance has an effect on the fault location line and therefore the operation of a distance protection relay is not reliable. When a fault occurs in a transmission line, the current increases and the fault must immediately to be located and eliminated. Many methods have been used. In this work, a new method of compensation is proposed based on the fault impedance calculation to correct the performance of the distance relay. We use the Mho distance relay characteristics to protect the high voltage transmission lines by digital technology. The MATLAB software is used for modeling the relay characteristics. The aim of this article is to compare the results obtained by our proposed method with the traditional and resistance compensation methods.