Abstract
Gas flow in arc quenching chamber has an important effect on the interruption capability of low voltage circuit breakers. In this paper, based on a simplified model of arc chamber with a single break, which can be opened by the electro- dynamics repulsion force automatically, the effect of different vent conditions including middle venting and side venting on the interruption performance is investigated. First, the effect of the different size of side vent type on the chamber pressure, and interruption capability were studied experimentally. It demonstrates that the smaller vent size is, the higher pressure and better the interruption performance will be, but when the vent size smaller than a certain proportion, the arc will re-ignite and when the vent size larger than a certain proportion, the arc will also re-ignite. Experiments are carried out to compare the different performance in the interruption process between middle vent to be conventional vent type and side vent type. In addition, according to the experimental model, a 3-D magneto- hydrodynamic model was developed by adapting and modified the commercial computational fluid dynamics software FLUENT. The simulation results show the same trend in arc motion as explained in the experimental conclusions in theory.
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