5/27/2023 0 Comments Micom p123 50n 51n![]() ![]() Time-delay built in the relays to provide coordination with other over current relays for selectivity.īy adjustment of current setting and time, using the most applicable of several ![]() Impedance between itself and the next downstream protection relay. On the final supply load or on any protection relay with sufficient circuit Instantaneous Over current Protection (50): Instantaneous or time delay over current relays. Over current relay protection is usually provided by either If these conditions are satisfied we can close the breaker. For example the conditions like LR Selector Switch in Remote Position, Breaker in Service, Bus Voltage Healthy, and Trip Circuit Healthy etc. This indicates when certain conditions are satisfied. If after a programmable time delay, the circuit breaker has not opened, breaker failure protection issues a trip signal to isolate the failure breaker by tripping other surrounding backup circuit breaker. This indicates for any fault causes over current in the earth element of the relay that exceeds the setting value. This indicates for any fault causes over current in the phase element of the relay that exceeds the setting value. ![]() This indicates no problem in the trip circuit. This indicates when any protection tripping occur causes breaker trips.
0 Comments
Leave a Reply. |