06EE62 - Switchgear and Protection Regulation (2006 - 2007) |
PART A |
UNIT – I SWITCHES AND FUSES |
Isolating switch, load breaking switch, Fuse law, cut -off characteristics,: Time current characteristics, fuse material, HRC
fuse, liquid fuse, Application of fuse. |
UNIT – II PRINCIPLES OF CIRCUIT BREAKERS |
Principles of AC Circuit
breaking, Principles of DC Circuit breaking, problems encountered in DC
breaking, Initiation of arc, maintenance of arc, Arc interruption - high
resistance and low resistance interruption, Arc interruption theories
slepians theory and energy balance theory, Re striking voltage, recovery
voltage, Rate of rise of Re striking voltage, current chopping, capacitance
switching, resistance switching, Rating of Circuit breakers. |
UNIT – III and IV CIRCUITS BREAKERS |
CIRCUITS BREAKERS: Air Circuit breakers Air break and Air blast
Circuit breakers, oil Circuit breakers - Single break, double break, minimum
OCB SF6 breaker - Preparation of SF6 gas, Puffer and non Puffer type of
SF6 breakers.
VACUUM CIRCUIT BREAKERS - Construction, principle of operation,
advantages and disadvantages of different types of Circuit breakers, Testing
of Circuit breakers, Unit testing, synthetic testing short circuit test lay out
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PART B |
UNIT – V PROTECTIVE RELAYING |
Requirement of Protective Relaying, Zones
of protection, primary and backup protection, Essential qualities of Protective
Relaying, Classification of Protective Relays |
UNIT – VI INDUCTION TYPE RELAY |
Non-directional and directional over current
relays, IDMT and Directional characteristics. Differential relay Principle of
operation, percentage differential relay, bias characteristics, distance relay
Three stepped distance protection, Impedance relay, Reactance relay, Mho
relay, Buchholz relay, Negative Sequence relay, Microprocessor based over
current relay block diagram approach.
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UNIT – VII and VIII PROTECTION SCHEMES |
Generator Protection - Merz price protection,
prime mover faults, stator and rotor faults, protection against abnormal
conditions unbalanced loading, loss of excitation, over speeding.
Transformer Protection - Differential protection, differential relay with
harmonic restraint, Inter turn faults Induction motor protection - protection
against electrical faults such as phase fault, ground fault, and abnormal
operating conditions such as single phasing, phase reversal, over load.
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REFERENCE |
TEXT BOOKS: |
1. Switchgear & Protection- Sunil S.Rao -Khanna Publishers
2. Power System Protection & Switchgear- Badriram & Viswa
Kharma -TMH.
3. Fundamentals of Power System protection- Y G. Painthankar and
S R Bhide-PHI publication, 2007.
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Reference Books |
1. A Course in Electrical Power- Soni, Gupta & Bhatnagar-
Dhanapatirai. Publication .
2. Power System Protection & Switchgear- Ravindarnath & Chandra
-New age Publications
3. Electrical Power- Dr S. L. Uppal- Khanna Publishers.
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