基于分形理论的真空击穿后电极表面微观形貌特征分析方法OA

The objective of this paper is to propose a method for analyzing the micro-morphology characteritics after vacuum breakdown based on fractal theory.First,the micro-morphology characteritics on the rod-plane electrode sur-face after vacuum breakdown is obtained through the dielectric strength under lightning impulse voltage.Then,the fractal dimension of electrode surface is estimated by a structure function method and,based on the fractal dimen-sion,the micro-morphology characteritics of electrode surface is analyzed.The results show that the fractal dimen-sion can be used to describe the micro-morphology characteristics of electrode surface and can be estimated by the structure function method.The estimated fractal dimensions of the horizontal and vertical directions of the curved surface are basically identical,indicating that the electrode surface after the lightning impulse voltage test exhibits good isotropy.For the plane electrode,the fractal dimension of surface is affected by the breakdown energy,and has no obvious relationship with the breakdown voltage.For the rod electrode,the fractal dimension of tip surface re-mains consistent under different experimental conditions and the value is approximately 2.91.Therefore,the surfac-es formed by vacuum breakdown under lightning impulse voltage has similar micro-morphology charactersitic,and fractal dimension can be used to describe such phenomenon.