低碳型35kV GIS的气室电场强度计算及结构优化-《郑州大学学报(工学版)》

文章信息/Info

Title:: The electric field strength calculation and structure optimization for the low carbon 35kV GIS chamber

作者:: 程显; 王海燕; 闫广超; 焦连曜; 1.郑州大学电气工程学院,河南郑州450001;2.平高集团有限公司,河南平顶山467000;3.平高集团有限公司,河南平顶山,467000;4.郑州大学电气工程学院,河南郑州,450001

Author(s):: Cheng Xian1;Wang Haiyan2;Yan Guangchao2;Jiao Lianyao3; 1. School of Electrical Engineering, Zhengzhou University, Zhengzhou, Henan 450001; 2. Pinggao Group Co., Ltd., Pingdingshan, Henan 467000 ;3. Pinggao Group Co., Ltd., Pingdingshan, Henan, 467000 4. School of Electrical Engineering, Zhengzhou University, Zhengzhou, Henan, 450001

Keywords:: GIS gas chamber; electric field strength calculation; insulation dielectric; electric field distribution; structure optimization

摘要:: 气体绝缘金属封闭开关柜气室的电场分布是其结构设计时需考虑的关键问题,应尽可能使气室内电场分布均匀,避免场强集中处发生闪络和放电现象.直接使用SF6/N2混合气体替代纯SF6气体作为35 kV电压等级GIS气室绝缘介质无法满足其绝缘要求.笔者针对此问题对GIS气室进行电场分析和结构优化研究.运用Solidworks软件建立GIS气室结构三维模型并进行有限元分析;基于静电场理论对气室模型进行电场数值计算,计算结果表明气室中隔离断口、接地断口、绝缘拉杆等处的电场强度过高,针对这些部位进行结构优化,并对优化后的气室模型进行校验计算.计算结果证明,优化后GIS气室内电场强度较之前显著降低,电场强度最大值低于替代气体绝缘强度,替代气体可满足优化后气室的绝缘要求.

Abstract:: The electric field distribution of the gas chamber of the gas-insulated metal-enclosed switchgear is a key issue to be considered in its structural design. The electric field distribution in the gas chamber should be as uniform as possible to avoid flashover and discharge at the place where the field intensity is concentrated. Direct use of SF6/N2 mixed Gas instead of pure SF6 gas as the insulation medium of 35 kV voltage level GIS gas chamber cannot meet its insulation requirements. To solve this problem, the author conducts electric field analysis and structural optimization research on GIS gas chamber. Using Solidworks software to establish a three-dimensional model of GIS gas chamber structure and conduct limited Meta-analysis; Based on the electrostatic field theory, the electric field numerical calculation of the gas chamber model is carried out. The calculation results show that the electric field strength at the isolation fracture, grounding fracture, and insulating tie rods in the gas chamber is too high. The structure of these parts is optimized, and the optimized The gas chamber model is verified and calculated. The calculation results prove that the electric field intensity in the optimized GIS gas chamber is significantly lower than before, and the maximum value of the electric field strength is lower than the insulation strength of the alternative gas, and the alternative gas can meet the insulation requirements of the optimized air chamber.