Abstract
Epoxy resin impregnated paper (RIP) dry bushings are an important part of transformers. The defects in the core insulation will seriously threaten the safe operation of the substation. This paper studies the influence of different types of defects on the electric field distortion of the RIP bushings. Constructed a model of dry casing, and set up bubble, crack and water drop defects in the model to study the influence of defect development on electric field distortion. It is indicated that the bubble defects, crack defects, and damp defects have an important impact on the electric field. Among them, the larger ones have a more serious effect on the electric field distortion. In addition, if the defect is inside the epoxy insulation, and located relatively close to the current conduit, the degree of electric field distortion is much greater than in other locations.
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