Safety of electric power systems depends heavily on distribution of electric field in high-voltage switchgear. Switchgear failure can lead to fatal disasters in important systems. It is necessary to evaluate electric field and insulation performance for high-voltage switchgear in key systems. In this paper, considering a high-voltage switchgear system designed for nuclear power station, a three-dimensional finite element model is developed for the whole system. Distribution of electric field is simulated under different loads, including the specified voltage and the overload. The insulation property of the switchgear system is then evaluated. Experiment on the physical prototype validates the simulation evaluation. To make the electrical field well distributed and reduce peak value, method of orthogonal experiment is used for parameter design. Optimization and improvement are then proposed. The optimization results show that the reliability is improved and the electric field is well distributed. The numerical model is established on personal computer, while it is solved remotely on High Performance Computing Center. Corresponding modeling techniques and computing methods are provided in this paper.

电力系统的安全性在很大程度上取决于高压开关柜中的电场分布。开关柜故障可能会在重要系统中导致致命的灾难。必须评估关键系统中高压开关设备的电场和绝缘性能。本文考虑核电站设计的高压开关柜系统，针对整个系统建立了三维有限元模型。在不同负载（包括指定电压和过载）下模拟电场分布。然后评估开关柜系统的绝缘性能。在物理原型上进行的实验验证了仿真评估。为了使电场分布均匀并减小峰值，采用正交试验的方法进行参数设计。然后提出优化和改进。优化结果表明，提高了可靠性，电场分布均匀。数值模型是在个人计算机上建立的，而在高性能计算中心上则是远程求解的。本文提供了相应的建模技术和计算方法。