Power System Protective Relaying-Part One

Power System Protective RelayPower System Protective Relay

DEEPAK RAJ

M10EE016

viii sem.

IntroductionIntroduction

Relays are used to protect the power system from complete failure.

IntroductionIntroduction

Nature Cause

IntroductionIntroduction

Equipment Failure

IntroductionIntroduction

Human Error

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 Protective RelaysTypical Protective Relays

Analog

digital

automatic

Portable Protective Relay Test Portable Protective Relay Test EquipmentEquipment

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

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