Experimental Study on Arc Physical Parameters of High Voltage SF6 Circuit Breaker

In order to master the arc characteristics of high-voltage SF6 circuit breaker during the breaking process, the arc characteristics detection method of SF6 circuit breaker is studied. The physical parameters such as arc voltage, current, nozzle dynamic pressure, and after arc current are tested. The relationship between arc quenching peak, after arc current value, nozzle throat pressure change and expected short-circuit current and charging pressure is analyzed. The results show that the increase of short-circuit current is expected to reduce the dielectric recovery strength of the arc gap when the arc current crosses zero, and the increase of charging pressure is conducive to the improvement of dielectric recovery strength of the arc gap when the arc current crosses zero.