基于ARM9的三相不平衡度测试仪设计

Design of three phase unbalance factor meter based on ARM9

以嵌入式ARM9控制器LPC3250为核心,并采用同时采样A/D转换器,设计了手持式三相不平衡度测试仪。可以同时测量8路交流信号的有效值、相位及三相电压电流的序量和不平衡度,且具有良好的人机界面。系统通过提高采样率并引入全相位FFT算法,可大幅提高幅值与相位测量精度,从而提高不平衡度的测量精度。系统可以将被测参数、趋势值、波形数据等存入SD卡,并通过网络接口实现远端通信,从而实现远程监控。

The handheld three phase unbalance factor meter based on LPC3250 and synchronous ADC is introduced. The meter can measure and monitor 8 channels AC signals at the same time. The RMS, phase, sequence quantity and three phase unbalance factor can be calculated at high speed. With all-phase FFT algorithm, the phase difference can be calculated with high accuracy, so the results of three phase unbalance factor are very accurate. The good human machine interface is offered. The electric parameters and waveform data can be stored in SD card and read by remote computer with network. This system has high accuracy of measurement, good calculating feature, large data storage capacity and low power consumption.