高电压技术2019，Vol.45Issue(4)：1093-1100,8.DOI:10.13336/j.1003-6520.hve.20181205022
负极性直流电压作用下SF6气体中极不均匀电场局部放电特性研究
Study on Partial Discharge Characteristics of Severe Non-uniform Electric Field in SF6 Under Negative DC Voltage
摘要
Abstract
With the development of HVDC technology, the DC gas insulated transmission line (GIL) with insulated SF6 is increasingly focused on. The metal tip defect in GIL will result in partial electric field concentration and lead to partial discharge (PD). Therefore, it is of great significance to investigate the PD characteristics of metal tip defects to provide an examination basis for the development of DC GIL. Based on the half-wave rectification principle, we set up a DC high voltage test platform and discussed the influences of SF6 pressure and coefficient of electric field inhomogeneity on the PD characteristics, and then studied the characteristics of PD development process. The results show that increasing SF6 pressure can increase the partial discharge initial voltage (PDIV), and the sensitivity of SF6 to gas pressure increases with the increase of SF6 pressure with small tip radius, and on the contrary, the sensitivity of SF6 to gas pressure decreases with the increase of SF6 pressure with relatively larger tip radius. Besides, increasing tip radius can decrease PDIV, SF6 is more sensitive to electric field inhomogeneity in low pressures and less sensitive to electric field inhomogeneity in high pressures, and the sensitivity decreases as the electric field inhomogeneity increases whatever in high or low SF6 pressures.The PD development process can be divided into 3 stages, including PD initiation stage, circulation development stage, and intermittent breakdown stage.关键词
GIL/金属尖端/SF6/气压/曲率半径/PDIV/放电过程Key words
GIL/metal tip/SF6/pressure/radius/PDIV/PD process引用本文复制引用
庞培川,孙泽明,张芊,韩旭涛,侯志强,李军浩..负极性直流电压作用下SF6气体中极不均匀电场局部放电特性研究[J].高电压技术,2019,45(4):1093-1100,8.基金项目
国家自然科学基金 (51877169) （51877169）
