EE6702 PROTECTION AND SWITCHGEAR
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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 | |
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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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