International Research Journal of Education and Technology

In today's contemporary world, ensuring the dependability and security of electrical power supply is a top priority. However, the increasing complexity of power systems makes it difficult for protective measures to satisfy these key objectives. Fortunately, relays have evolved as a critical component capable of performing complex processing tasks quickly and precisely. The time-current characteristics of overcurrent protection devices are critical in distribution systems. These qualities are carefully chosen and designed to guarantee that, in the case of a breakdown, protection devices activate in a specified time sequence. To solve this, a three-load distribution system has been methodically constructed and extensively simulated under various failure scenarios. The simulation results show that the system successfully regulates the relays, allowing them to respond quickly and precisely during fault circumstances. As a consequence, even when faults occur, the system constantly supplies power, ensuring the dependability and security of the electrical supply inside the distribution network.

Keywords— relay, three phase fault, circuit breaker, distribution system, domestic load, high tension load.