Simulation on Electrical Field Distribution of Polluted HVDC Wall Bushing

As a critical part in High Voltage Direct Current (HVDC) transmission, wall bushing undertakes the task of electrical insulation and mechanical support for other equipment. However, the dirt on the surface of wall bushing may influence the electrical field distribution. In this paper, the calculation model of ±400kV wall bushing was established using the FEM (finite element method) software ANSYS. Effect of several different types of filth locating on the surface of the wall bushing was separately studied to get the diverse features, including that contamination was uniformly distributed on the surface of the wall bushing as well as the unevenly damp filth. Also, the intermediate shielding electrode was brought in to optimize the structure. The electric field was obtained in all circumstances above and the distribution feature was concluded.