小型断路器外壳热固改热塑对短路分断性能的影响与优化  

Effect and Optimization on Short-Circuit Breaking Performance for MCB Shell Modification from Thermosetting to Thermoplastic

作　　者：陈昌足 周超 金平平 CHEN Changzu;ZHOU Chao;JIN Pingping(Shanghai Siemens Circuit Protection System Co.,Ltd.,Shanghai 201600,China)

机构地区：[1]上海西门子线路保护系统有限公司,上海201600

出　　处：《电器与能效管理技术》2024年第5期53-60,共8页Electrical & Energy Management Technology

摘　　要：为研究小型断路器(MCB)外壳材料的机械强度、抗高温电弧能力、产气量和介质恢复强度等特性,以及结构形式对其短路分断能力的影响,基于小型断路器外壳材料从某热固性的团状模塑料(BMC)改为某热塑性的PA6尼龙塑料的设计和某PA6材料特性,对外壳结构进行初步优化,通过不同外壳材料与结构的组合方案进行短路分断试验并获得试验数据。基于试验数据与试验后拆样信息划分燃弧阶段,探究各阶段燃弧时间、能量分布、稳定性与外壳材料及结构的关系,进行二次结构优化设计,最终通过短路分断试验。试验结果表明,热固改热塑的结构优化合理,对小型断路器短路分断试验的分析方法有效,可为同类产品热固改热塑设计与分析提供参考。Aiming to study the influence of shell material characteristics(such as mechanical strength,high-temperature arc resistance,gas production and dielectric recovery strength)and shell structure on short-circuit breaking ability,based on the design of the miniature circuit breaker(MCB)shell material modifying from a thermosetting bulk molding compound(BMC)to a thermoplastic PA6 and the characteristics of a PA6 material,the shell structure is optimized.The short-circuit breaking test is carried out through the combination of different shell material and structure,then the testing data is obtained.Based on the test data and the disassembly information after testing,the relationship of the distribution and stability of arc time and energy in each stage of short-circuit breaking with the shell material and structure is studied by dividing the arc stages,the structure of a PA6 shell MCB is optimized.Finally,the short-circuit breaking test is passed.The experimental results show that the structure optimization of the thermoplastic modification is reasonable,which indicates that the analysis method of short-circuit breaking test is effective and has certain reference significance for the design and analysis of similar products.

关 键 词：小型断路器 热固 热塑 分断性能 燃弧时间 燃弧能量 燃弧阶段 

分 类 号：TM561.1[电气工程—电器]