Optimal Coordination of Over-current Relay Using Particle Swarm Optimization (PSO) Algorithm

In the distribution network of power system, for protection of electrical systems the coordination of over-current (OC) relays is most essential for primary as well as secondary relay protection. In fault condition, it is required to minimize the total operating time of relay. Therefor, it can reduce the damage occurs in the system. It is also ensure that relay does not operate during normal condition. In OC relay coordination problem, the main objective is optimizing the sum of total operating time of functioning relays. In the current paper, coordination of constraint type OC relays in a radial fed distribution system is developed as an optimization problem using Particle Swarm Optimization(P SO) algorithm. This system shows that the plug settings and time dial setting (T DS), are an important aspect for operating time of relays. The obtain results from the PSO algorithm are compared with other existing optimization algorithms and it shows that the current technique gives minimal relay operating time with optimized TDS. From the result analysis, the obtained results by using PSO is efficient, simple and precise.