Patent ID: 6753678
Filing Date: 2004-06-22
Classification: G01R

Abstract:
A device for measuring voltage carried by an electrical conductor, said device comprising:a voltage detector; and a detector circuit in electrical communication with said voltage detector, said voltage detector and said detector circuit having impedance characteristics when said voltage detector and said detector circuit are measuring a voltage carried by an electrical conductor, said detector circuit having alternate internal input paths, means for switching between said alternate internal input paths in order to determine phase differences between voltage and current waveforms of said alternate internal input paths of said voltage detector and said detector circuit when said voltage detector is measuring said voltage, said phase differences being indicative of external capacitive reactance, comparing means for sensing and comparing electrical voltages produced by said voltage detector and said detector circuit when said switching means switches between said alternate internal input paths while said voltage detector and said detector circuit are measuring voltage from an electrical conductor, said comparing means producing an output signal; and computer processor means responsive to said comparing means and receiving said output signal from said comparing means for determining the effect of external capacitive reactance on said voltage measured by said voltage detector and said detector circuit and compensating for the effect of external capacitive reactance on said voltage.