The most important factor in evaluating the quality of relay protection is
The most important requisite of the protective relay is reliability since they supervise the circuit for a long time before a fault occurs. This guide is designed to inform engineers, power system operators, and technical enthusiasts about the calibration process, its importance for different relay types, and best practices based on. A comprehensive testing program should simulate fault and normal operating conditions of the relay. The protected zone is the part of the network in which faults cause the protection function to operate. One of the main requirements to relay protection is the sensitivity requirement, which implies consistent tripping during the short circuit (s c) events in the protected zone.
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