Simulation and Lead-In Design of Wall Bushings in Artificial Climate Chamber Under Complex Atmospheric Conditions

In order to explore the effects of atmospheric conditions on corona discharge under AC/DC composite voltage, it is proposed to build an artificial climate chamber that can simulate complex atmospheric conditions (0.5 ~ 1 atm, −30 ~ 80℃, 10 ~ 95% relative humidity) and lead in AC 100 kV (peak voltage) and DC ± 100 kV into the chamber with wall bushings. For the operation safety of the experiment under complex atmospheric conditions, the breakdown voltage is corrected, and the electric field intensity is controlled within corona control value. The finite element method is adopted to calculate the electric field distribution of three wall bushings with different installation positions. According to the simulation results, the best installation position is set to 0.6 m away from the upper wall. This paper provides a useful reference for the lead-in design of equipment insulation structure under complex atmospheric conditions.