Study on the Stress Distribution Characteristics of Dry- Type Bushing under Different Loads

The elongated structure of dry-type bushings makes them susceptible to stress concentration under external loads. In this study, a three-dimensional force field analysis model of the transformer-dry-type bushing system was established to investigate the distribution of the primary stresses in the dry-type bushing. This aims to reveal the weak areas of the bushing under external forces. The results indicate that, under the influence of gravity alone, the maximum stress in the dry-type bushing occurs at the bottom. However, under cantilever loads of 1600 N and heavy loads of 3150 N, the maximum stress concentrates at the contact point between the flange and the epoxy core body. Analyzing the stress weak areas in dry-type bushings provides a research basis for optimizing the design of the bushing structure.