Development of antithunder composite insulator for distribution line

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Abstract
In this article, the antithunder composite insulator combining a surge arrester and insulator is developed. The insulation design and configuration principle of the composite insulator are analyzed through experiments and simulation. The studies of insulation performance have shown that the external breakdown air distance is 60 mm, and the length of the polymeric support insulator is 70 mm. Considering the more serious pollution (0.3 mg/cm2), the creepage distance of the insulation section must be larger than 250 mm. Test data of the antithunder composite insulator meet the standard requirements. The analysis of mechanical performance of the antithunder composite insulator is carried out, which shows that the overall mechanical strength needs to be greater than 2.38 kN. A three‐dimensional (3D) element finite model is built to simulate the behavior of the antithunder composite insulator in the distribution line. The simulation results indicate that the stress on the varistor and the core rod decreases with the increase of the size of the core rod. A core rod of 20 mm or more can meet the operation requirements. The simulation indicates that the stress of the varistor determines the force limit of the antithunder composite insulator. Therefore, attention should be paid to the performance stability of the varistor of the antithunder insulator under force. © 2019 Institute of Electrical Engineers of Japan. Published by John Wiley & Sons, Inc.
Funding Information
  • State Grid Corporation of China Science and Technology Program (5216A01700UD)

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