ZW20 watchdog circuit breaker circuit for vacuum arcing and extinguishing

ZW20 watchdog vacuum circuit breaker and vacuum arc gas arc discharge phenomenon for our study is very different, free, main factors arc gas, forming a vacuum arc discharge at the contact electrode metal vapor evaporation. At the same time, the current size of the performance characteristics of the breaking arc is different. We usually classify it as a low current vacuum arc and a high current vacuum arc...

1. low current vacuum arc

When contact is broken in a vacuum state, electricity and energy collection points are generated, from a large amount of evaporated metal vapor on the spot, metal atoms, and high density charged particles, in which the arc is burned. At the same time, with metal vapor and charged particles continuously spreading outward, the electrode arc has been added to the new particles to evaporate. At the current 0 point, the arc energy decreases, the electrode temperature decreases, the evaporation decreases, the particle density of the arc column, and finally, the zero spot at zero disappears, and the arc extinguishes. Sometimes, the evaporation cannot sustain an arc column diffusion, the arc suddenly goes out and closes when it occurs.

2. large current vacuum arc

ZW20 watchdog circuit breaker contact break current, arc energy increased, the anode has a serious heat, forming arc column strong concentration. At the same time, the electric power is obvious, so the magnetic field between the high current vacuum arc and the contacts has a decisive influence on the arc stability distribution and arc pair performance. If the current is too great to exceed the limit to break the flow, it will cause the brake to malfunction. At this point, what is serious is that after contact, the current zero continues to evaporate, and the media restores difficulty and fails to disconnect the current heat.

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