On streamer inception in hydrocarbon liquids in point-plane gaps


Estimates for the discharge initiation voltage in hydrocarbon liquids in point-plane gaps are obtained, basing on analysis of the ionization integral describing electron multiplication in avalanches in liquids. An approach for estimation of the voltage needed to inception of filamentary streamers is presented. It assumes that, like in gases, a minimum radius of streamers propagating in liquids exist. It is shown, in agreement with printed experimental information for cyclohexane and pentane, that at point radii smaller than some threshold worth (of many micrometers) the discharge initiation voltage is not up to the voltage of inception of filamentary streamers. At point radii exceeding this threshold, filamentary streamers occur just at the discharge inception.

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