应用单片机实现交流电量参数的测量

系统采用89C5I单片机实现电力参数的交流采样，通过液晶显示器显示频率、相位差、电压和电流的实时值，在过压20％、欠压20％时进行报警，并能定时打印电压，电流、频率及相位差值。实践证明，采用交流采样方法进行数据采集，通过运算获得的电压、电流有功功率、功率因数等电力参数有很好的精确度和稳定性。

Applying SCM to Realize the Measurement of Electric Parameters

The system adopted 89C51 SCM to achieve alternating voltage sample of electric p arameters. The frequency, phase difference and real time value of voltage and cu rrent could be displayed through the liquid crystal display. If it was 20 percen t excessiveness or lack of normal voltage, an alarm will be given. The system co uld also type the voltage, current, frequency and phase difference regularly. It has proved that the electric parameters such as the active power of voltage and current, power factors and so on which obtained by alternating voltage sample h ave a wonderful accuracy and stability.