小型可调气压罐设计及复合电压下穿墙套管电场仿真研究

Design of Small Pressure Adjustable Tank and Research on Simulation of Electric Field of Wall Bushing under Composite Voltage

为便于模拟西部高海拔地区低气压环境，进而探究不同类型电压下电极电晕现象与环境气压的关系，需要设计一个气压可调、湿度可控的实验室用小型气压罐。为了判断气压罐的安全性，利用气压罐静态力场分析，计算出气压罐上的应力分布。气压罐设置了两个穿墙套管，可引入20kV直流电压、20kV交流电压及20kV交直流复合电压进行电晕实验。利用子模型法进行有限元分析，计算出不同绝缘长度、安装高度下两个套管的电场分布，并据此设计出直流套管与交流套管的绝缘结构以及最佳安装位置，从而保证实验装置可在0．5～1．0atm（1atm=101．325kPa）环境气压范围内安全地导入电压进行电晕实验。

In order to simulate the low air pressure envi- ronment of the western high altitude districts, a laboratory air pressure tank should be designed to explore the relationship between the corona characteristic and the environmental air pressure under different types of voltage, and the tank should be air pressure adjustable and humidity controlled. In this paper the stress distribution of the air pressure tank is calculated through the static field analysis to assess its safety. The pressure tank is equipped with two wall bushings, which are used to import 20 kV DC voltage, 20 kV AC voltage and 20 kV AC and DC composite voltage, to conduct the corona experiments. The finite element analysis with sub-modeling technique is adopted to calculate the electrostatic field distribution of the two wall bushings with different lengths of insulation or heights of installation position. And based on the results, the insulation structure and installation position of AC wall bushing and DC wall bushing are determined so as to ensure that the experi- mental device can safely apply voltage to conduct the corona experiment in the environment of 0.5-1.0 atm air pressure.