Energy based relaying scheme for series compensated line

This paper presents a directional relaying scheme for series compensated transmission line, which is based on initial change in the Fault Component Energy (FCE). During pre-fault condition, FCE is zero and after the inception of forward fault, FCE is negative and for reverse faults, it is positive. If FCE remains negative or positive for consecutive 15 samples, the direction of the fault is detected. The performance of the relaying scheme has been investigated using PSCAD/EMTDC simulations. It is found that scheme presented in this paper is robust against voltage and current inversion phenomena, TCSC impedance variation, MOV conduction, fault location variation, high resistance faults etc.