Enhancing the coordination of reverse power, overcurrent, under-frequency, and under-voltage relays using transient stability analysis in real plant applications

In order to achieve the optimization of the production process, power continuity is needed. The most important is the protection system, overcurrent relays are widely used as a primary relay to protect overload and short circuit. However, in some cases due to the nonlinearity pattern of the system, overcurrent relays does not grant the protection system. To overcome this problem, under-frequency and under-voltage relay are installed as a backup relay, but it also do not give the best result. This paper focused on the addition of reverse power relay to improve the system performance. Transient stability analysis is necessary to set reverse power relay because optimal power flow analysis cannot give proper parameter when a failure in grid happen. By arranging the delay time between those relays according to IEEE 242-2001, adequate coordination can be done. Moreover, the frequency and the voltage of the system stable at 100.04%, and 100.01%.