the real-time detection record of power quality can accurately and quickly analyze the factors that affect the power quality, which is of great significance to improve the national power quality. At present, the electric power monitoring instrument in the market can basically realize the measurement of electric power parameters, but the function is single and the practicability is not strong. So we designed a multi-functional intelligent power monitoring instrument, with three-phase voltage and current detection, harmonic detection, active power and reactive power calculation, electricity calculation, frequency measurement, vector graph, and other functions. The hardware and software design methods of the instrument are described. The window-interpolation FFT algorithm is used to calculate the power parameters, and the sampling frequency can be adjusted in time to reduce the influence of the barrier effect on the system. The test shows that the electric power meter is accurate, small in size, complete in function, simple in operation, and has serial communication function, which is worth popularizing.
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