In this paper, the critical flashover voltages of a 600 kV HVDC wall bushing with booster sheds and RTV coating are estimated by using a model recently developed by the authors. The improved performance of HVDC wall bushings is numerically verified, and agrees well with the results of large scale experiments and operational experience. The numerical evaluation and results obtained are very helpful in assessing the performance of HVDC wall bushings under different severe conditions and promoting the use of remedial measures.
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