550kV电容式电压互感器的均压设计

为改善550kV电容式电压互感器（CVT）电场均匀度，采用有限元分析方法（FEM）对含多重介质的轴对称无界场域电场进行数值模拟.建立了不同绝缘结构的电场计算模型，通过数值仿真计算得出电场分布，得到全场域绝缘性能的影响因素.通过对不同伞群结构以及有无均压环时全场域的电场对比分析，认为产品设计中设置合理的均压环是改善场均匀度的有效方法，并提供了均压环最佳位置及结构的参考尺寸，为550kV电容式电压互感器绝缘结构设计提供了数值基础.

Uniform potential design of 550 kV capacitor voltage transformer

In order to improve the electric field uniformity of 550 kV capacitor voltage transformer(CVT),the unbounded axisymmetrical electric field containing multi-dielectric medium was simulated using finite element method(FEM).The calculation model of electric field with different insulation structures was established,and the electric field distributions were obtained through numerical simulation.Moreover,the factors influencing the full-field insulating properties were determined.The comparison and analysis of different umbrella community structures as well as electric field with and without the grading ring reveal that the reasonable setting of grading ring is an effective method to improve the uniformity of electric field in product design.The optimal position and reference dimension of grading ring are offered,which provides the numerical foundation for the insulation structure design of 550 kV CVT.