Course Content
Switchgear installation and criteria for selection. Circuit breaker ratings, principles of a-c circuit breaking. RRRV and recovery voltage and their control. Current chopping. Switching of capacitive currents. Kilometric faults. Resistance switching. D-C circuit interruption. Principle of fusegear. Salient features and characteristics of different arc interrupting media - air, oil, air-blast, SF6 , and vacuum. The electric arc and circuit breaker. Establishing an arc, discharge characteristic of arc, long arc, short arc, energy transfer between electric field and the arc column, energy transfer out of the column. Theories of arc interruption - restriking voltage and energy - balance theories and their applications.
Text / References
- 1 C.H. Flurscheim Ed., Power circuit breaker theory and design, Peter Peregrinus Ltd., 1976. K. Regaller ed., Current interruption in high-voltage networks, Plenum Press, 1978.