Patent ID: 6185508
Filing Date: 2001-02-06
Classification: G01R

Abstract:
A power meter for determining power parameters for power lines having periodic 3-phase voltage and current signals distributed to a plurality of power equipment, the power lines having connected thereto at least one transducer generating analog signals representing the voltage and current signals, the power meter comprising:receiving circuitry operatively connected to receive the analog signals from the at least one transducer and generate an output signal therefrom;an analog to digital converter operatively connected to receive the output signal from the receiving circuitry and convert the voltage and current signals to digital data representing the analog signals;a processor operatively connected to receive the digital data and including logic for continuously adjusting a sampling rate of said analog to digital converter to be near synchronous with the voltage and current signals; anda fundamental frequency detector operatively adapted to receive the output signal from the receiving circuitry and provide a modified output signal representative of the fundamental frequency to said processor where said modified output signal is used by said logic for continuously adjusting the sampling rate.