Optimum coordination of overcurrent and distance relays using JAYA optimization algorithm

Distance relay and directional overcurrent relays especially IDMT (Inverse Definite Minimum Time) relays are used for main and backup protection respectively, to achieve better protection scheme of EHV transmission lines. It is vital that during abnormalities or faults, the Primary relay must be capable to isolate only the faulty part of power system from the healthy system. In case of primary relay operation failure, the backup relay should gives the tripping to isolate faulty part of power system. The relay operating time can be reduced with coordination between main protection relay and backup protection relay. This paper presents the directional overcurrent backup relay and distance relay coordination problem as constrained optimization non-linear problem. The application of JAYA optimization algorithm is presented to find optimum Time Multiplier Settings (TMS) and Plug Setting Multiplier (PSM) of overcurrent relays. Numerical results obtained with JAYA algorithm are presented.