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In an interruption chamber of Gas Circuit Breaker (GCB), a current is interrupted at current zero . SF6 gas is blown to an arc occurred between contacts. In this process, the gas blown from puffer chamber flows through a nozzle at high speed. For this reason, a supersonic region is formed and a pressure is decreased. It often causes a fault of interruption. In the downstream, a shock wave is often occurred. In recent years, these phenomena are investigated through experiments and numerical simulations. In order to design superior and reliable GCB's, it is very important to optimize the position of shock wave for an improvement of an interruption capability and stabilize the shock wave for stabilizing an interruption performance clarifying the uncertainty limit of supersonic region caused by uncertainty of manufacturing and using conditions. However, these techniques have not been developed yet. In the present paper, a new simulation method is proposed in order to design GCB's which have superior interruption capability. The method proposed by an author to include uncertainty of manufacturing and using conditions is combined with a usual code to solve Navier-Stokes equa tions. It is shown by using this method that the supersonic region is able to be controlled by optimizing the relationship at current zero between a fixed arc contact and a ditch designed in the nozzle, and that an uncertainty limit of the supersonic region is able to be clarified.

Gas Flow Simulation for Gas Circuit Breaker Accompanied with Shock Wave and Prediction of Uncertainty Limit of Supersonic Region