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SF_6/N_2混合气体替代纯SF_6气体作为35kV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.
The chamber electric field distribution of gas insulated metal enclosed switchgear is an important issue for its structural design. The chamber electric field distribution should be as uniform as possible to avoid flashover and discharge phenomenon in the high electric field strength place. In this paper,SF6/ N2 mixed gas replaces SF6 gas as an insulation dielectric of 35 kV voltage class GIS chamber. The electric field analysis and structural optimization are conducted to solve flashover problem in the chamber caused by the alternative gas insulated strength lower than the maximum electric field strength of chamber. The Solidworks software is used to build a three-dimensional model of GIS chamber,and its finite element analysis is conducted. The electric field intensity of chamber model is calculated based on the electrostatic field theory. The calculation dates show that the electric field strength values of disconnecting break,grounding break and insulated rod,etc in the chamber are too high. The structure optimization is conducted for those parts,and the optimized chamber model is carried on a verification calculation. The results proved that the electric field strength of optimized GIS chamber is significantly lower than previous one. Its maximum value is lower than the alternative gas dielectric strength,so the alternative gas can meet the insulation requirement of optimized gas chamber.
作者
程显
王海燕
闫广超
焦连曜
CHENG Xian WANG Haiyan YAN Guangchao JIAO Lianyao(School of Electrical Engineering, Zhengzhou University, Zhengzhou 450000, China Ping Gao Group Co, Ltd, Pingdings- han 467000, China)
出处
《郑州大学学报（工学版）》
CAS
北大核心
2016年第5期67-71,共5页
Journal of Zhengzhou University（Engineering Science）
基金
国家自然科学基金资助项目(51407163
51477024)
中国博士后科学基金资助项目(2014M552012
2015T80778)
关键词
GIS气室
场强计算
绝缘介质
电场分布
结构优化
GIS gas chamber
electric field strength calculation
insulation dielectric
electric field distribution
structure optimization
