多约束条件下低压开关柜电磁兼容改造设计分析  

Design and Analysis of EMC Reformof Low-Voltage Switch Cabinet under Multi Constraints

作　　者：沈志刚[1] SHEN Zhigang(Xiamen Huaxia International Power Development Co.,Ltd.,Xiamen 361026,China)

机构地区：[1]厦门华夏国际电力发展有限公司,福建厦门361026

出　　处：《自动化仪表》2021年第5期50-54,共5页Process Automation Instrumentation

摘　　要：对电动执行器低压开关柜混装化的技术进程进行梳理,采用事故树分析法说明电磁兼容(EMC)问题的影响和危害,并结合系统功能安全理论和炼化行业相关研究引证其重要性。以早期常规工业企业低压开关柜改造为实例,从负载约束、环境约束、接地约束等五个方面论述了改造过程中容易忽视的电磁兼容影响,并详细阐述了过孔、缝隙和接地等复杂干扰的影响机理。进一步通过检索对比新兴设计技术与常规工业企业改造需求,从技术差异方面找出了近年来改造用户体验差的根本性原因,并提出一种低压开关柜电磁兼容改造两端交互验证设计流程。该设计对于即将或已经开展低压开关柜改造的工业企业而言,有较高的借鉴价值,也有助于厘清研发设计与生产应用间的技术认知差异,防止工业应用体系出现技术断层,规避反复重建的资源浪费,促进国家工业体系的整体进步。According to the technical process of mixed installation of low-voltage switch cabinet of electric actuator,the influence and harm of electromagnetic compatibility(EMC)are illustrated by fault tree analysis method,and its importance is cited combined with system functional safety theory and related research in refining and chemical industry.Taking the reforms of low-voltage switch cabinet in conventional industrial enterprises as examples,the influence of EMC which is easy to be ignored in the reforming process from five aspects such as load constraint,environmental constraint,grounding constraint etc.is discussed,and expounds the influence mechanism of complex interferences such as via hole,gap and grounding is expounded.By searching and comparing the emerging design technology and the transformation needs of conventional industrial enterprises,the fundamental reasons for the poor user experiences in recent years are found out from the technical differences,and a design process of interactive verification at both ends of EMC reform of low-voltage switch cabinet is proposed.It is of great reference value for the industrial enterprises that are about to or have carried out the reform of low-voltage switch cabinet,and it is also helpful to clarify the technical cognitive differences between R&D design and production application,prevent technical faults in industrial application system,avoid repeated reconstruction of resource waste,and promote the overall progress of national industrial system.

关 键 词：低压开关柜 电动执行器 混装式 电磁兼容 负载约束 过孔缝隙 接地干扰 两端交互验证 

分 类 号：TH273[机械工程—机械制造及自动化]