Comparison of Field Mitigation Methods for HVDC Cable Joint Using Numerical Analysis

초록

For the design of HVDC cable system joints, it is necessary to consider the maximum field magnitude in the joint and the tangential field distribution at the interface, which is related to the breakdown performance of the insulation. In this paper, electrothermal numerical analysis was performed to compare geometric field grading (GFM) and field grading material (FGM) as field mitigation methods to improve the field distribution in the joint. For the GFM, we applied a kriging method that has an objective function to mitigate the maximum field in the joint for the external deflector geometry. Cross-linked polyethylene (XLPE) with nonlinear properties was applied as the cable insulation, and ethylene propylene diene monomer (EPDM) and silicone rubber (SiR) with nonlinear properties were applied as the joint insulation to compare the electrical conditions under different load conditions. © 2024 The Korean Institute of Electrical Engineers (KIEE).

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