Mixing Process of Arced Gas With Cold Gas in the Cylinder of Gas Circuit Breaker

Mixing process of high temperature and low temperature gases in the cylinder during arc back was observed for a model GCB with and without puffer action by shadow method. The volume and the temperature of the mixing region were estimated based on the results of the observation . The rate of volume increase of the mixed gas is expressed as a function of the arc power. The temperature of the mixed gas was found to decrease within ten milli-seconds after the arc initiation to around 300 K and 500 K in the cases with and without puffer action, respectively.