Coordination of protective relays in the substation

<p class="IEEEAbtract"><span lang="EN-US">To make an electrical system reliable and cost-effective, its protection coordination is crucial. Protection a study to determine the trip settings of protective devices. This research proposes for Mehran University Engineering Technology, Jamshoro, Sindh. includes relays connected at each department main relay with vacuum circuit breakers (VCB) by using time characteristic curves (TCC) delay setting ETAP software. method used particular breaker proper time. Hence, if fault occurs in any only that will be disconnected, rest departments remain working condition. helps maintain system’s high reliability.</span></p>