Breakdown characteristics of gases mixed with tetrachloroethylene mist under nearly uniform fields

A description is given of the breakdown characteristics of N/sub 2/ or SF/sub 6/ gas mixed with tetrachloroethylene mist under nearly uniform fields. The effect of the mist on the flashover voltage of the gas was experimentally studied for various gas pressures and applied voltage waveforms. A significant increase in the flashover voltage was produced by introducing the mist into the gas in the case of an applied impulse voltage. However, the voltage increased slightly only at low gas pressures when DC and AC voltages were applied. The effect of an electric field on the behavior of the mist is also discussed. Possible mechanisms by which the presence of the mist may contribute to the increase of the flashover voltage are discussed, and the increase is attributed principally to the scarcity of initial electrons in the gas mixed with the mist.<
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