一种支持机壳泄漏电流实时侦测和预警的工业以太网交换机设计方案  

A Design Scheme of Industrial Ethernet Witch Which Supports Real-time Detection and Early Warning of Shell Leakage Current

作　　者：占立 石磊 徐炜 肖正炜 李耀军 

机构地区：[1]煤炭工业合肥设计研究院有限责任公司,安徽合肥230000

出　　处：《工业控制计算机》2022年第11期28-29,32,共3页Industrial Control Computer

摘　　要：针对目前工业通信设备的安全要求,提出一种支持机壳泄漏电流实时侦测和预警的工业交换机的设计方法。硬件电路由交换电路、DSP处理器、高精度电流传感器、主处理器及以太网接口电路组成,软件设计基于嵌入式Linux操作系统。该工业以太网交换机支持设备外壳泄漏电流的实时侦测和预警,可根据泄漏电流的大小实时输出告警信号,也通过快速周期性地检测地电流的大小,并通过快速傅里叶变换算法,把时域图转换为频域图,提供多种模式的频谱图供现场用户分析使用,具有极高的可靠性和实时性,可满足大部分工业现场设备对安规、绝缘性能的实时安全要求。To meet the safety requirements of industrial communication equipment,a design method of industrial switch supporting real-time detection and early warning of shell leakage current is proposed in this paper.The hardware circuit consists of switching circuit,DSP processor,high precision current sensor,main processor and Ethernet interface circuit.The software design is based on embedded Linux operating system.The industrial Ethernet switches support equipment casing leak current real-time detection and early warning,can according to the size of the leakage current real-time output alarm signal,and through rapid periodic inspection to the size of the current,and through the fast Fourier transform algorithm,the time domain graph converted into frequency domain graph,offers a variety of patterns of spectrum for the use of on-site user analysis.

关 键 词：泄漏电流 实时侦测 安全告警 频谱图 

分 类 号：TP393.11[自动化与计算机技术—计算机应用技术] TN915.05[自动化与计算机技术—计算机科学与技术]