Title :
Influence of puffer volume and operating force on puffer pressure built up in thermal puffer type gas circuit breaker taking nozzle ablation into account
Author :
Osawa, N. ; Yoshioka, Y.
Author_Institution :
Dept. of Electr. Eng., Kanazawa Inst. of Technol., Ishikawa, Japan
Abstract :
In order to investigate the influence of puffer volume VP and operating force to dielectric performance of GCB at current interruption, we calculated the prospective dielectric withstand voltage VW between arcing contacts. The withstand voltage was calculated by the electric field strength appearing on arcing contacts and the allowable electric field strength E*W of hot gas due to thermal puffer action. We clarify that large initial puffer volume VP can increase withstand voltage VW at current breaking point and also that an optimum point exists in operating force F. For example, it was found that in case of the operating force of 1000 kgf, the puffer volume VP of 1.2 liter would be best choice in the interrupting condition of i=50 kA and arcing time of 1.35 cycle.
Keywords :
circuit-breaking arcs; electric breakdown; electric fields; electrical contacts; force; gas blast circuit breakers; nozzles; 50 kA; arcing contacts; current breaking point; current interruption; dielectric performance; dielectric withstand voltage; electric field strength; hot gas; nozzle ablation; operating force; puffer pressure; puffer volume; thermal puffer action; thermal puffer gas circuit breaker; Breakdown voltage; Circuit breakers; Circuit faults; Contacts; Dielectrics; Fluid flow; Temperature; Thermal force; Transient analysis; Weibull distribution;
Conference_Titel :
Power System Technology, 2002. Proceedings. PowerCon 2002. International Conference on
Print_ISBN :
0-7803-7459-2
DOI :
10.1109/ICPST.2002.1067808
