Relay Overcurrent Protection Circuit. Working principle of over current relay. In this tutorial the theoretical foundation of overcurrent relay is formulated and it will be designed in matlab simulink.
Overcurrent relay 52a i circuit breaker trip coil and auxiliary contact. Overcurrent protection relay relay protection against the high current was the earliest relay protection mechanism to develop. Depending on the time of operation the overcurrent relay is categorized into following types.
In an over current relay or o c relay the actuating quantity is only current.
These relays are typically applied to provide the main protection on feeders and interconnectors and the backup protection on items of plant such as transformers relays have four current inputs and are housed in e6 or e8 cases. To protect the solid state relays against load short circuits fuses must be used particularly fast acting fuses for small ratings. When normal current flows through this coil the magnetic effect generated by the coil is not sufficient to move the moving element of the relay as in this condition the. Using a fuse.
