DSP BASED POWER ANALYZING SYSTEM FOR ONSITE MEASUREMENTS

摘要

A three-phase power analyzing system based on digital signal processing (DSP) has been developed as a traveling standard for onsite power calibration. The design and operation is described for a sampling wattmeter capable of measuring power parameters of sinusoidal signal with frequencies of 50 to 60 Hz and measuring harmonics of nonsinusoidal signals up to 3 kHz. The system is utilized with digital-to-analog converts synchronized with each other. Software has been developed to calculate power parameters using the digital signal processing technique. The calibration system is traceable to national standard systems with an accuracy of 0.05percent and allows the calibration of industrial power measurement systems.