An Analysis of Blast Pressure Rise in Gas Circuit Breaker by a Single Molecule Model Taking the Nozzle Ablation into Consideration

Abstract

The thermal puffer type gas circuit breaker uses arc energy as the energy source of pressure rise in current interrupting operation. We proposed a calculation model of puffer pressure rise of thermal puffer type gas circuit breaker taking both arc energy and ablation gas due to nozzle clogging into consideration. In this model, nozzle ablation gas and arc energy dealt with boundary conditions. It was found that the ablation gas during nozzle clogging assists the back flow of gas in the passage and also it transfers arc energy to puffer chamber very efficiently. Thus the puffer pressure rise is influenced by the amount of ablation gas very much.
This paper describes the detail of the new model and the results of simulation.