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This work focuses on achieving a more uniform electric potential and electric field distribution along a 220 kV polymer surge arrester by installing a grading ring. A finite element–based 3D model of a 220 kV metal oxide surge arrester was successfully developed using COMSOL Multiphysics software. The dimensions of the grading ring were selected by considering the minimization of the electric field intensity along the varistors.The simulation results demonstrate that the proposed design significantly improves the voltage and electric field distribution, thereby helping to prevent the aging and degradation of the varistors.
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DOI: 10.1109/icateee68170.2025.11406343
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