복합소호형 고압차단기 O-CO 동작 차단특성 분석 연구

Abstract

The function of high voltage circuit breaker is to clear the fault current and protect the equipment in a power network when the overload or short circuit is generated in the network. High voltage circuit breaker should interrupt short circuit currents not only under Open operation for minimum arcing time but also under Open-CloseOpen operation for maximum arcing time. Self-blast type high voltage circuit breaker often fails to interrupt the short circuit current under the Open-CloseOpen operation condition. In this study, analysis of arc extinction characteristics under the Open-CloseOpen operation for maximum arcing time has been conducted for the self-blast type high voltage circuit breaker. Arc extinction phenomena were analyzed by simulation that was developed based on computational fluid dynamics. Arc simulations for high voltage circuit breaker use compressible gas dynamic equations(e.g. Navier-Stokes equations) including Ohmic input, Lorentz force and radiation transport. Relevant Maxwell's equations are included for the calculation of electromagnetic fields. The simulation results show that the arc extinction performance of the Open-CloseOpen operation is severely affected by the conditions of remaining thermal gas in the thermal expansion chamber after the first Open operation.