






Vol.2 , No. 2, Publication Date: Aug. 20, 2015, Page: 17-23
[1] | E. Saafan, Electrical Engineering Department, Faculty of Engineering, University of El-Mansoura, Mansoura, Egypt. |
Multi-break vacuum technology has a high dielectric strength restoration during switching-off processes. Based on this technology, vacuum circuit breakers have more efficient breaking capability than single break during current interruption processes. In this paper, numerous simulations of transitional processes conditioned by high voltage capacitor banks switching-off were performed using multi breaks of 110kV vacuum circuit breaker. In the present work the vacuum circuit breaker is modelled by the use of PSCAD/EMTDC program. Dielectric strength of the circuit breaker based on real inter-contact distance of the multi-break vacuum has taken into account in this research. The results obtained demonstrate that, use of triple-break vacuum leads to notable decreasing of switching overvoltages and allows in the same time to meet the dielectric requirements for vacuum circuit breakers in high voltage applications more than 110kV.
Keywords
Vacuum Circuit Breaker, Multi-Break Vacuum, Inter-Contact Distance, SF 6 Circuit Breaker, Capacitor Banks, Transient Recovery Voltage, Dielectric Strength, Repeated Re-Ignitions
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