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Unit-1 Introduction to Protection System:
Introduction to protection system and its elements, functions of protective relaying, protective zones,
primary and backup protection, desirable qualities of protective relaying, basic terminology.
Relays:
Electromagnetic, attracted and induction type relays, thermal relay, gas actuated relay, design
considerations of electromagnetic relay.

Lecture 1     Lecture 2       Lecture 3      Lecture 4     Lecture 5      Lecture 6      Lecture 7    

Unit-2 Relay Application and Characteristics:
Amplitude and phase comparators, over current relays, directional relays, distance relays, differential
relay
Static Relays:
Comparison with electromagnetic relay, classification and their description, over current relays,
directional relay, distance relays, differential relay.

Lecture 1     Lecture 2       Lecture 3      Lecture 4     Lecture 5      Lecture 6      Lecture 7       

Unit-3 Protection of Transmission Line:
Over current protection, distance protection, pilot wire protection, carrier current protection, protection
of bus, auto re-closing

Lecture 1     Lecture 2       Lecture 3      Lecture 4     Lecture 5      Lecture 6    

Unit-4 Circuit Breaking:
Properties of arc, arc extinction theories, re-striking voltage transient, current chopping, resistance
switching, capacitive current interruption, short line interruption, circuit breaker ratings.
Testing Of Circuit Breaker:
Classification, testing station and equipments, testing procedure, direct and indirect testing

Lecture 1     Lecture 2       Lecture 3      Lecture 4     Lecture 5      Lecture 6      Lecture 7       Lecture 8

Unit-5 Apparatus Protection:
Protection of Transformer, generator and motor.
Circuit Breaker:
Operating modes, selection of circuit breakers, constructional features and operation of Bulk Oil,
Minimum Oil, Air Blast, SF6, Vacuum and d. c. circuit breakers.

Lecture 1     Lecture 2       Lecture 3      Lecture 4     Lecture 5