Study of the stagnation region in HV gas-blast interrupters with synchronous gas injection

Abstract

Abstract According to modern trends in the development of HV gas blast circuit breakers GCB (such as increasing of rated voltage per break) a stagnation region in GCB rises and GCB interrupting ability is reduced. The zone of stagnation has the dominant influence on a thermal-dielectric recovery, since some quantity of hot gas medium remains in this region during the transient voltage recovery wave. The paper studies the stagnation region deformation in double-flow gas-blast interrupters with synchronous gas injection. The interaction between gas jet and the stagnation zone in the vicinity of current zero is discussed. Numerical analysis of basic gas flow with synchronous gas injection between arc contacts of the arc quenching chamber is presented.