Electronic mechanism of propagation of nanosecond breakdown channel in liquid organic dielectrics
Emlin R.V. 1, Punanov I.F. 1, Kulikov V.D. 2
1Institute of Electrophysics of the Ural Branch of the Russian Academy of Sciences, Yekaterinburg, Russia
2Tomsk Agricultural Institute,Tomsk, Russia
Email: emlin@iep.uran.ru, ivan.punanov@gmail.com, vdkulikov@rambler.ru

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The mechanism of anode-initiated breakdown in liquid organic dielectrics with long molecular chains is proposed on the basis of the experimental data on high velocities of the breakdown channel propagation in organosilicon and organofluorine liquids (~107 cm/s), which are comparable to those obtained earlier in crystals in the same conditions. The high velocities of the anode-initiated breakdown channels are satisfactorily explained within the model of the cascade Auger transitions, developed for the crystalline materials. According to this model, velocity of the breakdown channel propagation is proportional to the electrical field strength. The time delay in breakdown channel formation relative to the voltage pulse rise time does not exceed ~5·10-10 s within the margin of error. Keywords: electrical breakdown in liquid, nanosecond breakdown, breakdown mechanism.
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