ET-321                                   Power System Protection                 4(3+1)

Theory Cr Hrs, 3

Lab Cr Hrs, 1

Objectives:

The course presents different types of relays, relaying schemes, circuit breakers and fuses. Topics like discrimination and coordination are also introduced.

Course Outline:

Introduction to protection system, types of faults, effect of faults, fuse as protective device, types of fuses, characteristics of fuses, selection and application of fuses, discrimination and coordination, current transformer and its operation, relay construction, basic relay terminology, electromagnetic relays, thermal relays, static relays and introduction to microprocessor based protective relays, over current protection, distance protection, impedance relay, R-X diagram of impedance relay, operation of impedance relay in different zones, reactance relay, differential protection of transformers, generator protection, bus bar protection, arc voltage, arc interruption, re-striking voltage and recovery voltage, resistance switching, current chopping circuit breaker, classification of circuit breakers, oil circuit breakers, airblast circuit breakers, air break circuit breakers, SF6 circuit breakers, vacuum circuit breakers, operational mechanism and rating of circuit breakers.

Recommended Books:

1. S. Rao, "Switchgear and Protection", Khanna Publisher, Latest Edition.

2. Paithanker & Bhide, "Fundamentals of Power System Protection", Prentice Hall, Latest Edition.

Mapping of CLOs and PLOs