Patent ID: 7948225
Filing Date: 2011-05-24
Classification: G01R

Abstract:
1. A system for determining the phase of a current-carrying conductor relative to a reference phase, comprising: a reference unit positioned at a first location and calibrated relative to a second location to determine a calibration offset, where the reference unit samples and digitizes a voltage waveform at a reference location, applies the calibration offset to the samples, and transmits the digitized voltage waveform; a field sampling unit that, when placed on or directly adjacent a field conductor at a field location, transmits a signal representative of the voltage waveform of the field conductor; and a field unit that receives and digitizes the waveform received from the field sampling unit, and receives the digitized voltage waveform from the reference unit, and compares the digitized field waveform and the digitized reference waveform to determine the phase of the field conductor relative to the reference.