High Speed Digital Protection of EHV Line Using Travelling Waves

Extra High Voltage (EHV) transmission lines are designed to transfer sizably voluminous amount of potency from one location to another. The length exposed to the environment is a major reason for occurrence of faults on the lines. A fault on a high voltage transmission line affects the stability of the overall power system, which sometimes leads to aeonian damage of the equipment. Relays are developed and installed to bulwark the lines. The transmission line aegis relays, in the industry, are predicated on the fundamental frequency components of the voltages and currents. These relays need at least one fundamental frequency cycle for performing the aegis operation. In this paper digital techniques which use travelling waves for auspice of EHV line are proposed. Validation of the fault bulwark is performed utilizing MATLAB SIMULINK transient simulations by varying fault type and fault location.