What are the main functions of a protection relay?

What are the main functions of a protection relay?

Untitled- ELECTRICAL CLASSROOM

The main functions of a protective relay are the following:

·         Detection of the presence of a fault.
·         Detection of presence location of a fault.
·         Detection of presence type of fault.
·         To close the trip circuit and operate the circuit breaker to isolate the faulty system from the healthier one.

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