Swichgear & Protection
EE 651
Question
2081 Chaitra2076 Bhadra2071 BhadraChapter 6: Circuit Breaker6.1 Circuit Breaking Process: Arc Phenomena, Arc Extinction and Its Methods, Pre-Arcing and Arcing Time, Restricting Voltage and Recovery Voltage
A 50 Hz 3-phase alternator with grounded neutral has an inductance of 1.6 mH per phase and is connected to the bus-bars through a circuit breaker. The capacitance to earth of the circuit between the alternator and the circuit breaker is $0.0032,\mu\mathrm{F}$ per phase. Due to a short on the bus-bars the breaker opens when the rms value of the current is 8000 A. Determine the following (i) frequency of oscillation (ii) Active recovery voltage (iii) time for maximum RRRV and (iv) maximum RRRV.
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