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Optimal overcurrent relay coordination in distribution system using nonlinear programming method

A simple but powerful optimization method for coordination of over current (OC) relays is presented in this paper. For distribution system protection as well as backup protection in transmission system, overcurrent relay is most widely used. Maloperation of relays may occur if primary and backup relays are not properly coordinated. And therefore relay coordination become important part of power system protection. The main contribution of this paper is application of sequential quadratic programming (SQP) method for calculating optimum values of time multiplier setting (TMS) and plug setting (PS) of OCRs. The proposed algorithm was successfully tested on different systems. Comparison of results with genetic algorithm is also presented in this paper. From results it is found that SQP method is superior as compared to GA technique.