Distribution Characteristics of Electric Field Under Defect State of Large Shielding Ball in Valve Hall of Converter Station
摘要
The structure of valve hall fittings in UHV DC converter station directly affects the reliability and stability of each system in the converter station, surface defects will inevitably occur in the process of processing, transportation and installation of large size fittings, and the existence of these surface defects will reduce the switching impulse voltage of air gap. In this paper, the simulation model of shielding ball with three kinds of surface defects including screw protrusion, burr and scratch under ±800 kV and ±1100 kV is established, and the influence law of different defects on the surface electric field of shielding ball is analyzed.