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EE2402 Protection and Switchgear Nov/Dec 2012 Question Paper EEE 7th Semester Regulation 2008


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EE2402/EE72/ 10133 EE 702 Protection and Switchgear November /December  2012 Question Paper EEE 7th Semester Regulation 2008

Department of Electrical and Electronics Engineering 


Meant for Anna University Coimbatore,trichy,trinelveli



Question Paper
(Regulation 2008/2010)
___________________________________________________________________________________
Details:
University:Anna University
Year: Fourth Year
Semester: Seven (VII)
Content: EE2402/EE72/ 10133 EE 702 Protection and Switchgear November /December  2012 Question Paper EEE 7th Semester Regulation 2008
Subject code: EE2402/EE72/ 10133 EE 702
Subject Name: Protection and Switchgear
Regulation: 2008 or 2010 
Post Type: Question Paper
Question Paper  year: November /December  2012 


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CONTENTS COVERED

UNIT I INTRODUCTION 9 
Importance of protective schemes for electrical apparatus and power system. Qualitative review of
faults and fault currents - relay terminology – definitions - and essential qualities of protection.
Protection against over voltages due to lightning and switching - arcing grounds - Peterson Coil -
ground wires - surge absorber and diverters
Power System earthing – neutral Earthing - basic ideas of insulation coordination.

UNIT II OPERATING PRINCIPLES AND RELAY CHARACTERISTICS 9 
Electromagnetic relays – over current, directional and non-directional, distance, negative sequence,
differential and under frequency relays – Introduction to static relays.

UNIT III APPARATUS PROTECTION 9 
Main considerations in apparatus protection - transformer, generator and motor protection -
protection of busbars. Transmission line protection - zones of protection. CTs and PTs and their
applications in protection schemes.

UNIT IV THEORY OF CIRCUIT INTERRUPTION 9 
Physics of arc phenomena and arc interruption.
DC and AC circuit breaking - restriking voltage and recovery voltage - rate of rise of recovery voltage
- resistance switching - current chopping - interruption of capacitive current.

UNIT V CIRCUIT BREAKERS 9 
Types of circuit breakers – air blast, air break, oil, SF6 and vacuum circuit breakers – comparative
merits of different circuit breakers – testing of circuit breakers.


ATTACHMENT:

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