NUMERICAL OVERCURRENT PROTECTIVE RELAY USING THE RMS CALCULATION BASED ON THE QUADRATURE SAMPLING METHOD

In this paper, a model of a numerical overcurrent protective relay is proposed, tested in simulation and validated. The simulation of the model is performed using the Matlab simulating software package. The purpose of the simulation is to assess the performances of the model. In the SCAMRE laboratory and using the Schneider Electric Sepam MD2ADSEP pedagogical platform equipped with a Schneider Electric Sepam series 80 numerical protection relay, the model is validated. The proposed model has several advantages; one of them that is based on the quadrature sampling method, this method is rather precise and fast in the calculation of the root mean square values of a periodic signal. Another advantage that distinguishes the model is its easy implementation on all the types of the programmable electronic boards. Also, the proposed model supports the three tripping characteristics of the overcurrent protection: Instantaneous, definite time and inverse definite minimum time.