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Polymer/polymer composite insulating systems have been widely used in high-voltage equipment and power cables. Such composite insulating systems always have an interface between two polymeric insulating materials. This interface may cause partial discharge and electrical treeing under high electric stresses. The electrical properties of this polymer/polymer interfacehave not yet been fully understood. It has been shown in previous studies that the propagation characteristics of electrical trees in polymer/polymer composite insulating materials considerably vary depending on the combination of polymers. It has also been suggested that the 3-dimensional tree simulation based on a DBM model considering growth probability is valid.In this study, we will investigate the 3-dimensional simulated tree considering a composite insulator interface based on a DBM model with growth probability. キーワード：高分子-高分子界面，バリア効果，トリー，シミュレーション，成長確率Keywords：polymer/polymer interface, barrier effect, electrical tree, simulation, growth probability

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