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工程设计学报  2017, Vol. 24 Issue (4): 480-486    DOI: 10.3785/j.issn.1006-754X.2017.04.016
通用零部件设计     
塑壳断路器中灭弧室的优化设计与试验研究
武军亮1,2, 王明娣1
1. 苏州大学 机电工程学院, 江苏 苏州 215000;
2. 伊顿电气有限公司, 江苏 苏州 215000
Optimization design and experimental study of MCCB arc chamber
WU Jun-liang1,2, WANG Ming-di1
1. School of Mechanical and Electric Engineering, Soochow University, Suzhou 215000, China;
2. Eaton Electric Co., Ltd., Suzhou 215000, China
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摘要:

为了提高塑壳断路器的分断能力,对其灭弧室进行优化设计。基于电弧开断过程的理论研究,提出提高电弧电压的3种方式:1)优化灭弧栅片的结构,采用第1片引导、最后一片阻隔加上中间正常排布的方式,实现良好的切割电弧的效果;2)增加电机槽的磁吹结构,通过提高电弧受到的磁吹磁场强度来加快电弧的运动速度,借助ANSYS仿真方法可得新增加的磁吹结构使电弧增加了97 N的磁吹力;3)增加气吹结构,利用降低弧柱的温度来提高弧柱压降,采用介质恢复强度快的产气材料PA66作为气吹片。组合使用得到优化后的设计方案并制作样机,在室温(25℃)及415 V交流电压条件下进行短路分断实验,其分断能力由50 kA提升至70 kA,同时燃弧时间由5 ms缩短至3 ms。实验后拆解样机发现有部分试品出现灭弧室外壳破裂的问题,则将栅片基座开裂位置的壁厚增加2 mm,借助ANSYS的静力分析模块,对变更前后的外壳进行等效应力比较,分析结果显示新结构的强度提升了40.2%,再次装配样机后,最终顺利通过工程试验。研究成果对后续塑壳断路器的新品开发及改进设计具有一定的参考作用。

关键词: 塑壳断路器电弧电压分断能力灭弧室优化    
Abstract:

In order to improve the interrupting capacity of MCCB (molded case circuit breaker), the arc chamber of MCCB is optimized.Based on the theoretical study of the arc breaking process,three methods were used to improve the arc voltage.Firstly,the structures of arc plates were optimized,the pattern of the first piece's guide,the last piece's obstruction and the middle pieces' normal arrangement was used to achieve a good effect of arc cutting.Secondly,the mag-netic flux structure of slot motor was added,the speed of arc could be increased by increasing the intensity of magnetic field,the results of ANSYS simulation showed that the new structure in-creased 97 N magnetic blow force.Thirdly,air blowing structure was added,the voltage drop of arc column was increased by reducing the temperature of arc column,and PA66 was used as the gassing insert which had the fast recovery rate of medium.The methods were combined to get the optimized design scheme and to make the prototype sample to do short circuit interrupting test under the condition of 25℃ & 415 V AC voltage.Originally,it could only pass 50 kA,after op-timization it could pass 70 kA and the arcing time was shortened from 5 ms to 3 ms at the same time.It could be found that some of the products appeared arc chamber shell cracked issue after disassembling these samples,so the wall thickness of the crack position was increased 2 mm,the static analysis module of ANSYS was used to compare the equivalent stress of the shell before and after the change.The results showed that the new structure improved the strength of 40.2%, and it passed the engineering test after the new prototype samples were assembled again.The re-searching achievement has a certain significance for the follow -up new development and design improve-ment of MCCB products.

Key words: MCCB    arc voltage    interrupting capacity    arc chamber    optimization
收稿日期: 2016-12-05 出版日期: 2017-08-28
CLC:  TM561  
通讯作者: 王明娣(1975-),女,江苏靖江人,教授,硕士生导师,博士,从事激光加工技术、复合传动技术和夹具技术、机构创新等研究,E-mail:wangmingdi@sudae.du.cn     E-mail: wangmingdi@sudae.du.cn
作者简介: 武军亮(1984-),男,江苏盐城人,硕士生,从事低压电器研究,E-mail:wujunliang134@163.com,http://orcid.org/0000-0002-6311-3331
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引用本文:

武军亮, 王明娣. 塑壳断路器中灭弧室的优化设计与试验研究[J]. 工程设计学报, 2017, 24(4): 480-486.

WU Jun-liang, WANG Ming-di. Optimization design and experimental study of MCCB arc chamber[J]. Chinese Journal of Engineering Design, 2017, 24(4): 480-486.

链接本文:

https://www.zjujournals.com/gcsjxb/CN/10.3785/j.issn.1006-754X.2017.04.016        https://www.zjujournals.com/gcsjxb/CN/Y2017/V24/I4/480

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