Long range phasing voltmeter

Details Long range phasing voltmeter Long range phasing voltmeter

2008-07-21

2010-10-05

Nguyen, Vincent Q (Department: 2831)

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Phase comparison

C324S126000, C324S107000

Reexamination Certificate

active

07808228

ABSTRACT:
A long range wireless phasing voltmeter determines the phase difference between the time-varying voltage carried on a reference electrical conductor and another, field conductor. The voltage signal from the reference conductor is measured by a reference probe and compared by a first unit in communication with that reference probe to a 60 Hz signal generated from a GPS receiver. The phase difference, in the form of a nine-bit, audible signal using frequency shift keying to modulate the carrier frequency, is transmitted to a second unit perhaps miles away. A receiver in the second unit decodes the signal and uses another 60 Hz signal generated from another GPS receiver to re-create and then forward a surrogate of the original reference voltage signal to a meter probe that is measuring the signal on a field conductor. The meter probe can then compare the two signals to determine the phase angle difference.

REFERENCES:
patent: 6617840 (2003-09-01), Bierer
patent: 6642700 (2003-11-01), Slade et al.
patent: 6734658 (2004-05-01), Bierer
patent: 7109699 (2006-09-01), Bierer
Webpage Innovative Technologies for the Energy Industry (article entitled the AP-20 System: Fast, Simple Phase Identification from http://www.edmlink.com/AP20—Avistar.html dated Sep. 24, 2008.

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