In electronic circuits, a relay is a switch that is operated electrically to control the circuit with low power or one signal. First, relays are used as amplifiers in long-distance circuits. The function of the relays is to re-transmit the replicated signal out from one circuit to another circuit. Relays are electromechanical type, solid-state type, and reed type. Similarly, distance relays are one of the types and versatile relays used for distance protection, which depends on the distance … [Read more...]

A distance relay is a fundamental device that trips the circuit breaker in the event of a fault. In low rating power systems circuits, the relay itself can trip the circuit, without the circuit breaker. The relay along with the circuit breaker together are used for the protection of transmission and distribution systems. Relays are classified in large based on the principle of operation. We have overcurrent relays, differential relay, frequency relay, etc. for which the operating quantity is … [Read more...]