Abstract
The hot gas inside the exhaust chamber of a gas circuit breaker (GCB) is investigated after short-circuit current interruption. It is found that the exhausted hot gas generates a compression pressure wave. When the interrupting arc energy is low, the velocity of the hot gas is low and the hot gas is delayed relative to the pressure wave at the exit of the exhaust chamber. The interaction between the pressure wave and the hot gas is weak and the hot gas is found concentrated near the centre of the exhaust chamber. When the interrupting arc energy becomes high, the velocity of the hot gas becomes high and it is found that the hot gas area overlaps the area of increased pressure. The interaction between the pressure wave and the hot gas is strong, the hot gas density distribution becomes flat due to the pressure increase and the pressure increase is enhanced by the hot gas flow. The pressure increase clogs the exit of the exhaust chamber and the gas near the upstream area loses its dielectric strength.
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