Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Phase comparison
Patent
1989-11-06
1991-10-08
Williams, Hezron E.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Phase comparison
324 83D, G01R 2500
Patent
active
050557696
ABSTRACT:
A method and apparatus are described for determining the charcteristics of an alternating current electrical service at a remote panel as compared with a main panel from which the remote service is connected. The method involves the steps of selecting a line at the main panel and designating it as the reference. The phase relationship of other lines at the main service panel are determined relative to this reference by a process of deriving the period of the signal on the reference line, and from this point the phase relationship of the other line signals are determined. A counter is loaded with a value representative of the derived period of the reference signal, and finally, the characteristics of the individual service line signals at a remote location are determined by a step of comparing each with the characteristics derived for the main service panel.
REFERENCES:
patent: 3555417 (1971-01-01), Mitchell, Sr.
patent: 4626622 (1986-12-01), Bouvrette
patent: 4710703 (1987-12-01), Harkiewicz et al.
Arana Louis M.
The Fleming Group
Williams Hezron E.
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