What is REF protection

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Accepted Answer

REF protection stands for Restricted Earth Fault protection, used in electrical systems to detect earth faults in the protected zone.

REF protection is a type of differential protection that compares the current entering and leaving a zone to detect earth faults.
It is commonly used in power transformers, generators, and motors to protect against earth faults.
REF protection operates based on the principle that in a healthy system, the current entering and leaving a zone should be equal, but in the presence of a fault, there will be a difference.
The protection relay will trip the circuit breaker if an earth fault is detected to isolate the faulty section of the system.
REF protection is essential for ensuring the safety and reliability of electrical systems.

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