注入電荷モデルによる空間電荷電界の数値解析

概要

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According to recent high polymer chemistry, high molecule substances have been utilized fairly well as an insulator. In the case where high molecule materials are used as insulators, it may be known that breakdown path called "tree" is generated. This treeing breakdown grows from a weakest point in the insulator. Commonly, in order to simulate a weakest point in an insulators, generation and growing up of treeing breakdown are investigated with the high molecule material inserted needle electrodes. In this paper, Laplace field at the needle tip on the system of needle-plate electrode was analyzed with method of finite differences. As the result, the electric field at the needle tip was about 28[MV/cm]. For the consideration of space charge electric field distribution with the charge injected from needle electrodes, injected charge model was assumed and the analysis with method of finite elements was done. In a consequence of this calculation on the space charge electric field distribution, effectual charge density and injection charge quantity may be estimated approximately 4×10^<16> per cubic centimeter and 24.6 pico-coulomb respectively.