Electrical properties calculation of HVDC bushing

This paper reports electric properties calculation of a composite housed SF6 insulated bushing based on the finite element method. After introducing different stages of electric field distribution under DC voltage, the finite element method and boundary conditions are described. The electric field distribution, time constant of transmission from conductive distribution to resistive distribution are presented, taking a polarity reversal into consideration. The surface charge formation, its influence of electric distribution, and the influence of polarity reversal are discussed as well. The polarity reversal and its effect on the electric properties of the bushing are focused on in this paper.