基于虚拟仪器的电网过电压在线监测系统

结合输电网内外过电压的各自特点,设计了阻容分压器作为信号获取装置,基于虚拟仪器技术开发了一套电网过电压在线监测系统。信号调理单元对分压器捕获到的电压信号进行预处理,采用预触发技术在过电压到来时能有效触发采集。软件基于虚拟仪器技术,配合高速采集板卡,可方便调用、分析处理数据并进行图形化显示;采用数据压缩和网络技术,实现对现场过电压的远程访问。高压实验室模拟试验及应用结果表明系统工作稳定、测量准确,测试数据及过电压波形能真实反映电网过电压情况。

On-line over-voltage monitoring system based on virtual instrument

According to characters of internal and external over-voltage in transmission network,an on-line over-voltage monitoring system based on virtual instrument is designed,which takes the resistance-capacitance voltage divider as the signal acquiring equipment.The signal conditioning unit processes the signal from voltage divider.The trig-in-advance technology is used to effectively start signal acquisition when over-voltage comes.The system software is based on virtual instrumentation technology.Cooperated with high-speed digitizer,it calls and analyzes data,and displays them in graphics.Data compression technology and network technology are applied for remote accessing to field over-voltage.The simulative test in high-voltage lab and the site operation show that,the system is stable and accurate,and the tested data and recorded waveform reflect the power line over-voltage truely.