EE 9306 Protection and Switch Gear Syllabus download

EE9306 PROTECTION AND SWITCHGEAR L T P C
3 0 0 3
AIM
To study the various faults and protection schemes in power systems.
OBJECTIVES
 To discuss the need for the protection and various protection schemes.
 To study relays characteristics
 To Study apparatus protection
 To understand the method of circuit breaking, arcing phenomena – various arc
theories -capacitive and inductive breaking.
 To understand the working of different types of circuit breakers. 27
UNIT I INTRODUCTION 9
Principles and need for protective schemes – nature and causes of faults – types of
faults – fault current calculation using symmetrical components – earthing – Zones of
protection and essential qualities of protection – Protection schemes – CTs and PTs and
their applications.
UNIT II PROTECTIVE RELAYS 9
Operating principles of relays, the universal relay, torque equation, relay characteristics,
electromagnetic relays – over current, directional, distance and differential relays,
negative sequence relays, static relays - amplitude and phase comparators, Introduction
to numerical relays.
UNIT III APPARATUS PROTECTION 9
Apparatus protection – transformer, generator, motor – protection of bus bars and
transmission lines.
UNIT IV THEORY OF CIRCUIT INTERRUPTION 9
Physics of arc phenomena and arc interruption. Restriking voltage and recovery voltage,
rate of rise of recovery voltage, resistance switching, current chopping, interruption of
capacitive current, DC circuit breaking.
UNIT V CIRCUIT BREAKERS 9
Types of Circuit Breakers – Air blast, air break, oil, SF6 and Vacuum circuit breakers –
Comparison of different circuit breakers.
TOTAL : 45 PERIODS
TEXT BOOKS:
1. B.Ravindranath and N.Chander, “Power System Protection and Switchgear”, New
Age International (P) Ltd., 1stEdition 1997 (Reprint 2006)
2. Badri Ram , B.H.Vishwakarma, “Power System Protection and Switchgear”, Tata
McGraw-Hill, 2001.
REFERENCES:
1. Sunil S.Rao “Switchgear and Protection”, Khanna publishers, New Delhi, 1986.
2. C.L.Wadhwa, “Electrical Power Systems”, New Age International (P) Ltd., 4thEdition 2005.
3. Y.G.Paithankar and S.R.Bhide, “Fundamentals of power system protection”,
Prentice Hall of India Pvt. Ltd., New Delhi – 2003.
4. M.L.Soni, P.V.Gupta, U.S.Bhatnagar, A.Chakrabarti, “A Text Book on Power
System Engineering”, Dhanpat Rai & Co., 1998.
5. A.T.Johns, S.K.Salman, “Digital protection for power systems” Peter Peregrinus,
IEE 1995.

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