Abstract
Arc formation may occur through a hot gas ejected from a moulded-case circuit breaker (MCCB) between thesource-side terminals of the MCCB. The formation of the arc inthe hot gas was studied. Electrodes of 1 mm diameter with agap length of 3 mm were located near the exhaust hole of the hotgas to record the time variation of the conductance of the hotgas. The conductance was found to increase gradually for a time and then to rise abruptly on the occurrence of the arcingphenomenon. The arcing phenomenon was shown to occur when thegas conductance and the voltage applied across the hot gasreached 30 mS and 300 V respectively. From this criticalconductance, the critical values of electrical conductivityand temperature were estimated to be 3.4-4.5 S m-1 and3800-4100 K, respectively.
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