Monday, January 5, 2015

EE6702 PROTECTION AND SWITCHGEAR

EE6702 PROTECTION AND SWITCHGEAR syllabus-subject-notes-pevious-year-questions-papers-bank

OBJECTIVES:
 To educate the causes of abnormal operating conditions (faults, lightning and switching surges) of
the apparatus and system.
 To introduce the characteristics and functions of relays and protection schemes.
 To impart knowledge on apparatus protection
 To introduce static and numerical relays
 To impart knowledge on functioning of circuit breakers

UNIT I PROTECTION SCHEMES 9
Principles and need for protective schemes – nature and causes of faults – types of faults – fault
current calculation using symmetrical components – Methods of Neutral grounding – Zones of
protection and essential qualities of protection – Protection schemes

UNIT II ELECTROMAGNETIC RELAYS 9
Operating principles of relays - the Universal relay – Torque equation – R-X diagram –
Electromagnetic Relays – Overcurrent, Directional, Distance, Differential, Negative sequence and
Under frequency relays.

UNIT III APPARATUS PROTECTION 9
Current transformers and Potential transformers and their applications in protection schemes -
Protection of transformer, generator, motor, busbars and transmission line.

UNIT IV STATIC RELAYS AND NUMERICAL PROTECTION 9
Static relays – Phase, Amplitude Comparators – Synthesis of various relays using Static comparators
– Block diagram of Numerical relays – Overcurrent protection, transformer differential protection,
distant protection of transmission lines.

UNIT V CIRCUIT BREAKERS 9
Physics of arcing phenomenon and arc interruption - DC and AC circuit breaking – re-striking voltage and recovery voltage - rate of rise of recovery voltage - resistance switching - current chopping - interruption of capacitive current - Types of circuit breakers – air blast, air break, oil, SF6 and vacuum circuit breakers – comparison of different circuit breakers – Rating and selection of Circuit breakers.

TEXT BOOKS:
1. Sunil S.Rao, ‘Switchgear and Protection’, Khanna Publishers, New Delhi, 2008.
2. B.Rabindranath and N.Chander, ‘Power System Protection and Switchgear’, New Age International (P) Ltd., First Edition 2011.
3. M.L.Soni, P.V.Gupta, U.S.Bhatnagar, A.Chakrabarti, ‘A Text Book on Power System Engineering’, Dhanpat Rai & Co.,1998.

REFERENCES:
1. Badri Ram ,B.H. Vishwakarma, ‘Power System Protection and Switchgear’, New Age International Pvt Ltd Publishers, Second Edition 2011.
2. Y.G.Paithankar and S.R.Bhide, ‘Fundamentals of power system protection’, Second Edition,
Prentice Hall of India Pvt. Ltd., New Delhi, 2010.
3. C.L.Wadhwa, ‘Electrical Power Systems’, 6th Edition, New Age International (P) Ltd., 2010
4. Ravindra P.Singh, ‘ Switchgear and Power System Protection’, PHI Learning Private Ltd., New
Delhi, 2009.
5. Bhavesh Bhalja, R.P. Maheshwari, Nilesh G. Chotani,’Protection and Switchgear’ Oxford University Press, 2011.

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