Relay Overcurrent Protection Circuit. 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. The overcurrent protection is a bigger concept so that the overload protection can be considered as a subset of overcurrent protection.
The overcurrent relay is defined as the relay which operates only when the value of the current is greater than the relay setting time. Working principle of over current relay. Overcurrent relay 52a i circuit breaker trip coil and auxiliary contact.
Overcurrent relay 52a i circuit breaker trip coil and auxiliary contact.
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. In an over current relay or o c relay the actuating quantity is only current. Depending on the time of operation the overcurrent relay is categorized into following types. Are required to construct this protective relay.
