| Summary: | Creepage discharges on oil impregnated pressboard is one of the most dangerous transformer insulation fault, which can cause the gas action even transformer housing cracking accident. “White spot” is creepage important phenomena in the process of insulation board along the surface, so it is necessary to study the insulation board along the surface of creepage “white spot” in the process of growth characteristics. This paper set up a insulating paper along the surface of creepage “white spot” in the process of growth characteristics of observation platform. Numerical example was calculated under different aging degree creepage cardboard along the surface of the “white spot” in the process of change, statistics and analysis of the “white spot” length, angle and size variation, which is very practical to the production practice.
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