引言电绝缘材料老化特性和绝缘寿命的测定对材料用户是极为重要的。已研究了预测绝缘寿命的几种普通方法,如时间与绝缘击穿的关系、临界击穿场强、电树行为和损耗正切随时间的变化。最终的绝缘击穿机理,至今尚未确定,尽管绝缘系统中的空隙和气隙 Introduction Determination of aging properties and insulation life of electrically insulating materials is of paramount importance to the material user. Several common methods of predicting dielectric lifetime have been studied, such as the relationship between time and dielectric breakdown, the critical breakdown field strength, the behavior of the electrical tree and the loss tangent over time. The ultimate mechanism of insulation breakdown has not been determined so far, although the voids and gaps in the insulation system