A numerical model is established in the present research on the basis of a theoretical analysis, for describing and analyzing the electric field of High Voltage Direct Current (HVDC) wall bushing that demonstrates highly nonlinear characteristics. The relationship between the electric field intensity and the resistance of the insulators of the wall bushing is highly nonlinear and the wall bushing is subjected high voltage with nonlinear electric field. A numerical iteration technique is developed with the Parameter Design Language (PDL) of a Finite Element Analysis software package for carrying out the numerical calculations. The nonlinear characteristics of the HVDC wall bushing are investigated with the model and the iteration technique established. The methodology presented in the research provides a new approach for designing and manufacturing the HVDC wall bushing.

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