Optimisation of corona ring design and its impact on the performance of insulator string in high voltage transmission lines / Kalaiselvi Aramugam

Kalaiselvi , Aramugam (2022) Optimisation of corona ring design and its impact on the performance of insulator string in high voltage transmission lines / Kalaiselvi Aramugam. PhD thesis, Universiti Malaya.

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Abstract

Installation of a corona ring on an insulator string on a transmission line is one of the solutions to reduce the electric field stress surrounding the energised end of the insulator string. However, installing a corona ring with an optimum design to reduce the electric field magnitude on an insulator string is a challenging task. Therefore, in this work, a method to achieve an optimum design of a corona ring for a 33 kV and 132 kV composite non-ceramic insulator string was proposed using optimisation methods; Gravitational Search Algorithm (GSA), Imperialist Competitive Algorithm (ICA) and Grey Wolf Optimisation (GWO). The composite non-ceramic insulator string geometry with and without corona ring was modeled in finite element analysis and used to obtain the electric field distribution in the model geometry. The electric field distribution was evaluated using variation of corona ring dimensions, i.e. the ring diameter, the ring tube diameter and the vertical position of the ring along the insulator string. From the results achieved, comparison of the minimum electric field magnitude along the insulator string with a corona ring design shows that the minimum electric field magnitude is lower using optimisation techniques. Among the methods tested, the most suitable technique is found based on insulator model used in this work. Hence, this indicates the capability and effectiveness of the proposed methods in achieving an optimum design of a corona ring on an insulator string.

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