Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Plural inputs
Patent
1990-12-28
1992-09-08
Nguyen, Vinh
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Plural inputs
324107, 324141, 364483, G01R 1116, G01R 1900
Patent
active
051461579
ABSTRACT:
Separate pulse inputs from respective metering circuits, representing the reactive R and in-phase W power components, are converted to a pulse output V representing the vector sum of those components. The two inputs are applied to increment respective registers, the output V is held in a third register, and a fourth register is provided to store the REMAINDER value (W.sup.2 +R.sup.2)-(V+1).sup.2. The meter includes a processor for incrementing the REMAINDER value by 2W+1 for each increment of W and 2R+1 for each increment of R and for incrementing V whenever the REMAINDER value is zero or positive and at the same time reducing the REMAINDER value by 2V.sub.1 +1, where V.sub.1 is the incremented value of V. The FRACTIONAL error in the value of V is determined by means of a look-up table.
REFERENCES:
patent: 4257004 (1981-03-01), Miller
patent: 4454471 (1984-06-01), Schwendtner et al.
patent: 4837504 (1989-06-01), Baer et al.
patent: 4902965 (1990-02-01), Bodrug et al.
Clarke David J.
Hutchinson Michael D.
Asman Sanford J.
Nguyen Vinh
Schlumberger Industries Limited
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