What is use of purpose relay in substation

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Accepted Answer

Purpose relay is used to protect the equipment from damage due to abnormal conditions in the power system.

Purpose relay is a protective relay that operates when the power system experiences abnormal conditions.
It is used to protect equipment such as transformers, generators, and transmission lines from damage.
Purpose relay can detect faults such as overvoltage, undervoltage, overcurrent, and underfrequency.
When a fault is detected, the purpose relay sends a signal to the circuit breaker to isolate the faulty equipment from the power system.
Purpose relay is an important component of substation protection system.
Example: A purpose relay can detect overvoltage in a transformer and trip the circuit breaker to prevent damage to the transformer.

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