Abstract
The paper aims to understand how the fractal dimension and growth time of electrical trees change with temperature and moisture. The fractal dimension of final electrical trees was estimated using 2-D box-counting method. Four groups of electrical trees were grown at variable moisture and temperature. The relation between growth time and fractal dimension of electrical trees were summarized. The results indicate the final electrical trees can have similar fractal dimensions via similar tree growth time at different combinations of moisture level and temperature conditions.
Highlights
Electrical treeing is a typical degradation mechanism in polymers
Electric charges around the weak parts could cause partial discharge. e PD activity around weak part can cause the initial electrical tree [3]. e insulation breakdown in electrical machines, HV cable insulation, switchgear, and transformer bushings can be triggered by electrical treeing [4]
A charged-coupled device (CCD) camera mounted on a microscope was used to take digital pictures from two electrical tree samples. e pictures were taken after every 40 fine focus steps from the first clear branch to the last. e composed images were compiled by software called Montage. e distance between branches and camera lens is different
Summary
Electrical treeing is a typical degradation mechanism in polymers. E analysis of electrical trees is important due to the faulty insulation in polymers. Electrical treeing occurs in weak parts of the polymers [2]. Electric charges around the weak parts could cause partial discharge. E PD (partial discharge) activity around weak part (as a result of void) can cause the initial electrical tree [3]. E insulation breakdown in electrical machines, HV cable insulation, switchgear, and transformer bushings can be triggered by electrical treeing [4]. A typical electrical tree in underground cable insulator could grow from the electrode asperities gradually until final breakdown. E faulty insulation in the polymers of this cable could cause a short circuit between the inner and outer conductors A typical electrical tree in underground cable insulator could grow from the electrode asperities gradually until final breakdown. e faulty insulation in the polymers of this cable could cause a short circuit between the inner and outer conductors
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