抽屉式框架断路器桥型触头的关键技术研究
潘璇，李军，陈大江，王忠
（南京大全电气研究院有限公司，江苏 南京 211100）
摘 要：桥型触头是抽屉式断路器的重要部件，研究了桥型触头的操作力及动、热稳定性，通过简化弹簧片为等强度梁以及对工作状态进行力学分析，得出正压力和插入力的计算公式及关系，并通过试验中正压力与拔出力的测试得到经验摩擦系数。利用导电触桥模型描述U 型排与桥型触头之间的接触情形，计算二者之间的洛伦兹力、霍姆力、接触电阻及温升，得出校验其动稳定性与热稳定性的理论计算方法，为桥型触头的设计提供了思路。
关键词：桥型触头；插入力；动稳定性；热稳定性
中图分类号：TM561 文献标识码：A 文章编号：1007-3175(2017)03-0038-04
Key Technique Research of Bridge-Type Contact in Withdrawable Air Circuit Breaker
PAN Xuan, LI Jun, CHEN Da-jiang, WANG Zhong
（Nanjing Daqo Electrical Institute Co., Ltd, Nanjing 2111 00, China）
Abstract: The bridge-type contact is the important part of withdrawable air circuit breaker. This paper researched the operating force, dynamic stability and thermal stability of bridge-type contacts. The spring plate was simplified as the constant strength girder and the mechanical analysis was carried out for working condition to obtain the computational formulas and relationship between forward force and inserting force. The experienced friction coefficient was got by testing forward force and extraction force. The contact situation between U-type busbar and bridgetype contact was described by using the conductive contact bridge model. This paper calculated Lorentz force, Holm force, contact resistance and temperature rise between both of them and obtained the theoretical calculation method to examine its dynamic stability and thermal stability, which provides the design thought for the bridge-type contact.
Key words: bridge-type contact; insertion force; dynamic stability; thermal stability
参考文献
[1] 李保定，崔静，刘进伟. 低压抽屉式开关柜主回路接插件的可靠性[J]. 电工文摘，2011(3)：66-72.
[2] 万祥军. 抽屉式万能断路器母排倒角形式对摇手柄操作力的影响[J]. 低压电器，2011(6)：10-12.
[3] 成大先. 机械设计手册第3 卷[K].5 版. 北京：化学工业出版社，2008.
[4] 陆俭国，何瑞华，陈德桂，等. 中国电气工程大典. 第11卷. 配电工程[M].北京：中国电力出版社，2009.
[5] 刘文娟，季慧玉，柳德金. 抽屉式断路器抽屉座的主要技术分析[J]. 低压电器，2011(9)：14-16.
[6] 管瑞良，顾建青，刘洪武. 基于有限元分析的框架断路器触头系统短路耐受能力校核[C]// 中国电工技术学会低压电器专业委员会第十三届学术年会论文集，2007.
[7] 夏天伟，丁明道. 电器学[M]. 北京：机械工业出版社，2011.
