Experimental and Simulation Study of Partial Arc Activities on Post Insulators with Booster Sheds under Heavy Icing Conditions

摘要

The reliability of power systems is a major challenge in cold climate regions. Heavy ice or snow accumulation on high voltage insulators can lead to considerable reduction of their flashover voltage, sometimes resulting in flashover failures and power outages. Many approaches have been proposed to improve the reliability of ice-covered insulators so far. The effectiveness of these methods depends on ice severity. Field experience demonstrates that post station insulators are more exposed to flashover failures than line insulators under the same icing conditions. This is mainly because of stronger electrical stresses, as well as smaller shed spacing causing ice bridging for a smaller quantity of ice accretion as compared to line insulators. To prevent ice bridging of insulator sheds, some methods can be applied like using booster sheds (BSs), creepage extenders, larger shed-to-shed distance profiles, or semiconducting glaze covers. The present study focuses on using BSs as a way to reduce flashover voltage of post station insulators. A booster shed (BS) is a C-shaped insulation piece with large diameter generally made of high quality insulating materials.