*2.1. CB*

The operation of a CB at the substation outlet is carried out and ensured with some relays like Over Current Relay (OCR), Over Current Ground Relay (OCGR), and reclosing relay. There are various types of setting methods depending on the configuration of distribution lines. Basically, the CB acts as back-up protection for recloser downstream on distribution lines and reclosing operation to decide whether a fault is temporary or permanent. Then the CB retains lock-out and open state for a permanent fault.
