Abstract

AbstractGas valves are the key control components for the reuse of arc energy in high voltage self-blast circuit breaker. In this paper, the formulas of check valve and relief valve are derived considering the spring force, gas pressure load, inertial force and contact force applied. Then the arc model of a 252 kV self-blast circuit breaker is established, simulated and verified by pressure test. The comparison results show that the simulation has a good agreement with measurement, and the maximum relative error was less than 10%. The load simulation results show that for both 75 kA and 25 kA working conditions, the peak value of expansion chamber pressure lags behind the current by about 0.0018 s. In addition, the pressure rise of expansion chamber is jointly dominated by the compression effect of piston and arc heating. The simulation of gas valves can give useful information for the design of the interrupter and mechanical driver.KeywordsSimulationSelf-blast circuit breakerExpansion chamberValve

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