The N-curve of SF₆ describes the relationship between the AC breakdown voltage in an extremely inhomogeneous electric field and pressurized SF₆ gas. It is directly dependent on the electric field distribution, which is determined by the gas gap, curvature radius, and background electric field. An increase in gap distance, a decrease in curvature radius, and relatively weak background electric field are all conducive to corona stabilization. The electrode curvature radius is the determining factor in the positive glow corona (PGC) discharge quenching pressure. The breakdown voltage dominated by the streamer mechanism can be estimated accurately by calculating the electric field based on the Deutsch assumption and combining it with the SF₆ static field breakdown criterion. The proposed method is applicable to the estimation of N-curves in gaps with varying field distributions. The work presented in this paper may support further quantitative research on the discharge mechanism of strongly electronegative gas dielectrics.

SF ₆的N曲线描述了极不均匀电场中的AC击穿电压与SF ₆加压气体之间的关系。它直接取决于电场分布，该电场分布由气隙，曲率半径和背景电场确定。间隙距离的增加，曲率半径的减小以及相对弱的背景电场都有助于电晕的稳定。电极曲率半径是正辉光电晕（PGC）放电淬火压力的决定因素。通过基于Deutsch假设计算电场并将其与SF ₆结合，可以准确估算出拖缆机构主导的击穿电压。静电场击穿准则。该方法适用于不同场分布的间隙中N曲线的估计。本文提出的工作可能会支持对强电负性气体电介质放电机理的进一步定量研究。