Protective Relay Coordination
In Power System Networks, protection has to be designed such that Protective Relays isolate the faulted portion of the network, to prevent equipment damage, injury to operators and to ensure minimum system disruption enabling continuity of service to healthy portion of the network.
The Protective Relay as primary and backup is important in distribution system. A relay itself
will be the primary protection to protect its own system element and when to
backup other relays for fault at a location, it is serve to be a backup relay.
The protective relay should be time coordinated with the other relay, so that
the primary relay will always operate faster than its backup relay. So, the
coordination and setting of a relay is really important to ensure which relay
to operate first and the other one stand for the backup protection. Therefore,
the relay can perform both function either as primary relay or backup relay for
a remote zone of protection.
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