## EE6702 PROTECTION AND SWITCHGEAR

Subject Informations :

University        :  Anna University
Department     :  B.E. ELECTRICAL AND ELECTRONICS ENGINEERING
Semester          :  07 th sem
Year                  :  04 th year ( Final Year )
Regulation       :  R2013
Subject Code   :  EE6702
Subject Name  :  PROTECTION AND SWITCHGEAR

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EE6702 PROTECTION AND SWITCHGEAR  | Important  Questions

EE6702 PROTECTION AND SWITCHGEAR – SYLLABUS – R- 2013

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

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

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

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

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

Physics of arcing phenomenon and arc interruption – DC and AC circuit breaking – re-striking voltageand 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 vacuumcircuit breakers – comparison of different circuit breakers – Rating and selection of Circuit breakers.

TOTAL : 45 PERIODS

OUTCOMES:

 Ability to understand and analyze power system operation, stability, control and protection

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