摘要
真空断路器灭弧室的内部结构优化对提高其绝缘及开断性能有重要意义,为此建立一种具有不对称屏蔽罩的12 kV真空断路器灭弧室的二维模型,利用ANSYS Maxwell软件中的静电场模块对其内部电场进行计算,得到相应位置的电场分布云图、电位分布云图以及电场分布曲线图,随后根据计算结果对内部绝缘结构进行优化,并对不同结构进行对比分析。结果表明:12 kV真空断路器灭弧室在主屏蔽罩两端部裙边处、动静触头片外侧边缘处以及主屏蔽罩动触头侧间隙处均存在电场集中现象,当主屏蔽罩动静触头端裙边翻转角度分别为90°和45°,动静触头片外边缘圆角半径为2.5 mm,以及主屏蔽罩与动静触头间距为11 mm时,可避免上述电场集中现象。最终得出结论:主屏蔽罩的裙边翻转角度、触头片的圆角半径以及主屏蔽罩的半径对真空断路器灭弧室内部电场分布影响较大,可通过优化这几处的参数来提高绝缘性能。
The optimization of internal structure of the vacuum circuit breaker arc extinguishing chamber is of great significance to improve its insulation and breaking performance.This paper establishes a two-dimensional model of a 12 kV vacuum arc extinguishing chamber with an asymmetric shield.By using the electrostatic field module in Ansys Maxwell software,it calculates the internal electric field,and obtains the electric field distribution cloud chart,potential distribution cloud chart and electric field distribution curves at the corresponding position.Afterwards,the internal insulation structure is optimized according to the calculation results,and the different structures are compared and analyzed.The results show that there are electric field concentrations in the 12 kV vacuum arc extinguishing chamber at the skirts of two ends of the main shield,the outer edges of the moving and static contact pieces,and the gap between the moving contacts of the main shield.When the skirt flip angles are 90°and 45°,the radius of the outer edge of the moving and static contact pieces is 2.5 mm and the distance between the main shield and the moving and static contacts is 11 mm,the above-mentioned electric field concentrations can be avoided.The final conclusion can be drawn as that the rollover angle of the skirt of the main shield,the radius of the contact piece and the radius of the main shield have a great influence on the electric field distribution inside the vacuum arc extinguishing chamber.It is able to improve insulation performance by optimizing these parameters.
作者
董华军
宋杰
陈培军
孙鹏
库照宇
DONG Huajun;SONG Jie;CHEN Peijun;SUN Peng;KU Zhaoyu(School of Mechanical Engineering,Dalian Jiaotong University,Dalian,Liaoning 116028,China;Pinggao Group Co.,Ltd.,Pingdingshan,Henan 467001,China)
出处
《广东电力》
2021年第12期95-103,共9页
Guangdong Electric Power
基金
国家自然科学基金项目(51477023)
辽宁省自然科学基金计划项目(2019-MS-036)。
关键词
不对称屏蔽罩
真空断路器灭弧室
电场分析
优化
asymmetric shield
vacuum circuit breaker arc extinguishing chamber
electric field analysis
optimization
