ポリプロピレン蒸着薄膜を用いた高電界誘電特性測定用電極系の試作
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概要
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Non‐polar polymers such as polyethylene (PE) and polypropylene (PP) are widely used as very important electrical insulating and dielectric materials. They are used in the increasingly high AC electric field strength region approaching to the limit of electrical breakdown strength of the materials. Therefore the study of high‐field dielectric property is very important in terms of understanding the AC breakdown mechanism of materials. Three terminal electrode system using a guard film (new type electrode system) was developed in our laboratory for the precise measurement of high-field tan δ,where the guard film was used to reduce the disturbance of electric field around the edge of main electrode. However minute air sometimes steal between sample film and guard film. The air void sometimes generates partial discharge in the high electric field region. Therefore, when the sample has air void, the new type electrode system was limited under 100kV/mm application that doesn't reach the true breakdown strength of polymer film, which has 30μm in thickness. We have tried to improve the new electrode system without air void between sample film and guard film. We also try to make very thin guard film to reduce the field disturbance at the edge of main electrode. ln this paper the guard film was made by evaporation of PP and biaxially oriented polypropylene (BOPP) film was used as a sample film. This improvement of the electrode system using evaporated PP guard film was in success and high‐field dielectric properties of BOPP film could be measured up to near the breakdown field of the sample.
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