Simulation Study on Electric Field Characteristics of Spacer Under DC Superimposed Impulse Voltage
摘要
In HVDC GIL systems, the superimposed impulse voltage on the existing DC operating voltage poses a serious threat to electrical insulation. While the influence of DC superimposed impulse voltage has been widely studied through experimental methods, simulation studies have received comparatively little attention. In this paper, a multi-physics model is built to analyze the electric field characteristics of spacers under DC superimposed impulse voltage and investigates the influence of geometrical parameters on electric field distribution. Results indicate that a smaller ratio of inner diameter of enclosure to inner diameter of conductor and a larger insulation distance of spacer result in a smaller maximum electric field strength on the surface of spacers. This work provides valuable insights for the design of HVDC GIL.