Measurement of breakdown current in dielectric materials

Abstract

A new method to determine the resistance of the breakdown channel, current, and characteristic time is based on the measurements of the breakdown current pulse in a wide range of parameters of the mea surement circuit. A problem with time dependent resistance of the breakdown channel is numerically solved. An experimental variation in the resistance of the breakdown channel can be used to estimate the breakdown time. The method is tested with the aid of computer experiments and employed in the analysis of oscillograms of breakdown current in experiments with a dielectric polymer.

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“…After subtraction of (), we will have the conductive current (Figure c). Let us note that the similar method of the conductive current calculation based on determining of the displacement current parameters (period and decrement) and its subtraction from the total current is described in the recent paper . It can be concluded from this oscillogram that within a pulse the polarity of the electrodes and the direction of the current change have a period of about 34 ns and with their own period of the oscillating circuit of the generator output circuit is with the load.…”