A breakdown model of dielectrics, which exists some blemish inside or on the surface, such as hole, impurity and heave at which breakdown probability is larger than that at other points, was established.

• 建立了含有缺陷点的绝缘介质击穿模型，指出电缆绝缘层内部及表面存在空洞、夹杂物和隆凸不平是缺陷产生的内在因素，缺陷点处的击穿概率较大。