Short Time Interval Decay Measurement of Space Charge in Epoxy Resin

概要

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It is shown here that positive space charge was formed mainly near the anode when a DC voltage in the range 8 -13kV was applied to a epoxy resin sample for one hour of which thickness is 280μm. When the voltage was removed most of this charge disappeared in a few tens of seconds, but the remainder decayed on a much longer time scale, i.e. there are two types of decay region, a fast decay and a slow decay. Here we investigate the decay mechanism of the space charge in the fast decay region. It was found that the rate of decay in this region was greater when the applied voltage and the amount of injected charge was bigger, and that the decay current estimated from the decay plot obeyed a Schottky relationship with the electrode field estimated from the space charge distribution. Furthemore the relative permittivity calculated from the slope of the Schottky plot was near the known value for the epoxy resin. It is concluded that charge injection via the Schottky mechanism determines the neutralising current in the fast decay region.
2006-04-01