Candidates can get Best Power System Protection and Switchgear Books 2018 also a Top List of Main Study Materials for 2017-2018 entrance exam in India.
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.
OPERATING PRINCIPLES AND RELAY CHARACTERISTICS
Electromagnetic relays – over current, directional and non-directional, distance, negative
sequence, differential and under frequency relays – Introduction to static relays.
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.
THEORY OF CIRCUIT INTERRUPTION
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.
Types of circuit breakers – air blast, air break, oil, SF6 and vacuum circuit breakers –
comparative merits of different circuit breakers – testing of circuit breakers.