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IntroductionIntroduction
Relay:an electric device that is designed to respond to input conditions in a prescribed manner and , after specified conditions are met, to cause contact operation or similar abrupt change in associated electric control circuits. (IEEE)
IntroductionIntroduction
Protective Relay:A relay whose function is to detect defective lines or apparatus or other power system conditions of an abnormal or dangerous nature and to initiate appropriate control circuit action. (IEEE)
Typical Relay and Circuit Typical Relay and Circuit Breaker ConnectionsBreaker ConnectionsTypical single line AC connection
Typical Relay and Circuit Typical Relay and Circuit Breaker ConnectionsBreaker ConnectionsTypical three-phase AC connection
Basic Objectives of System Basic Objectives of System ProtectionProtectionReliabilitySelectivitySpeed of OperationSimplicityEconomics
Classification of RelaysClassification of Relays
Protective Relays Regulating Relays Reclosing, Synchronism Check, and
Synchronizing Relays Monitoring Relays Auxiliary Relays Others