局部放电在线监测多路复用器的设计

Design of Multiplexer for Partial Discharge On-line Monitoring System

根据变电站现场局部放电监测系统的特点和需求,将通信技术中的时分多路复用技术的概念引入多路信号采集测量系统中,以多路器芯片MAX4638为核心,应用虚拟仪器这一功能强大的工具,设计了局部放电监测用多路复用器,克服了多通道同时采集时占用硬件资源大、可靠性差等缺点。采用轮询方式实现了一台检测单元对多台设备或多路信号的分时采集处理,从而极大地提高了局部放电在线监测系统现场应用的经济性和实用性。

In accordance with the characteristics and requirments of the partial discharge monitoring system at substation site, the concept of time-division multiplexing technology in communication technology is introduced into the multichannel signal acquisition and measuring system, and the multiplexer MAX4638 is used as the core, with the applica- tion of virtual instrument as a powerful tool, the multiplexer for the partial discharge monitoring system is designed. Shortcomings of the device are overcome in the multi-channel synchronous acquisition, such as hardware resources consumption, poor reliability and high cost. By using the polling method to achieve one detection device for time-sharing acquisition and processing of multiple devices or signals, the on-line monitoring system performances are obviously improved in the field application.