Abstract
A gel is used as the encapsulant of a power device. But there are a lot of uncertain points about the electrical properties of the gel. We have investigated the time series measurement of electric field distributions in propylene carbonate that was a dielectric liquid with large Kerr constant. The propylene carbonate dissolves polymethyl methacrylate resin and becomes gelatinous. It was considered that the relevance between the electrical properties of the gel and the liquid might become clear, if temporal change of the electric field strength could be measured in this gel. So, in this paper, we studied that the electric field strength could be measured in the gel using Kerr effect.
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