摘要
为了提高防爆组合开关的安全性,需要自动检测其负载侧的绝缘性能,设计了一种可靠的组合开关负载侧多路绝缘自动测量装置。该装置采用模块化的设计思路,包括上位机、电源模块、高压检测电路、中央处理器Atmega16以及中央处理器Atmega64五个模块。上位机主要用来发送接收指令、显示组合开关状态和检测数据等。电源模块主要用来将工频交流电转化成供单片机使用的SV电压和供高压检测电路使用的12 V电压。高压检测电路将直流电压12 V转变成2500 V,加载在负载侧测量绝缘电阻。中央处理器Atmega16主要用来检测12路的闭锁情况和驱动继电器开合负载电路。中央处理器Atmega64主要用来接收处理上位机的指令,判断是否具备检测条件,控制闭锁灯和检测灯的亮暗,采集处理检测数值并发送给上位机。两个中央处理器通过RXD/TXD实现实时通信。中央处理器Atmega64与上位机的通信采用RS485技术实现,通信规约采用工业标准Modbus协议。工程实践表明该装置能够快速准确地检测组合开关负载侧多路绝缘电阻值,大大提高了现场的工作效率。
In order to improve the safety of explosion-proof combination switch,the insulation performance of the load side need to automatically detect.A reliable combination switch load side multi-channel insulation automatic measuring device is designed.The device adopts the modular design thinking,including PC,power supply module,high pressure detection circuit,the central processor unit(CPU)Atmega 16 and Atmega64.PC is used to send and receive instruction,display combination switch state and testing data,and so on.Power supply module is mainly used to convert alternating current(AC)power into 5 V for the use of single-chip microcomputer and 12 V for high voltage testing circuit.High voltage detection circuit convert DC 12 V to DC 2500 V which load on the load side to measure insulation resistance.The CPU Atmegal6 is maiiily used to detect 12 channel atresia state and drive relay opening and closing load circuit.The CPU Atmega64 is mainly used to receive PC5s instructions,determine whether have test conditions,control the opening and closing of atresia light and detect light,collect and process the testing numerical value and then sent to PC.Two CPU achieve real-time communication through the RXD/TXD.The CPU Atmega64 achieve real-time communication with PC adopting RS 485 technology,and communication protocols adopt industry standard Modbus protocol.Engineering practices show that the device can rapidly and accurately detect combination switch load side multi-channel insulation resistance,greatly improve the work efficiency.
作者
蔡正梓
管树威
田园
熊辉
樊亮
CAI Zhengzi;GUAN Shuwei;TIAN Yuan;XIONG Hui;FAN Liang(State Grid Beijing Electric Power Company Power Dispatch and Control Center,Beijing 100031,China;State Grid Materials Co.,Ltd.,Beijing 100724,China)
出处
《电气应用》
2019年第12期108-113,共6页
Electrotechnical Application
关键词
绝缘电阻
组合开关
多路测量
自动测量
insulation resistance
combination switch
multi-channel
automatic measurement
