Electrical measuring instrument for high voltage power measureme

Details Electrical measuring instrument for high voltage power measureme Electrical measuring instrument for high voltage power measureme

1987-12-11

1989-05-23

Tokar, Michael J.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Plural inputs

324 86, 324107, 324127, G01R 700

Patent

active

048334014

ABSTRACT:
A current-comparator technique for obtaining an instrument for accurate high voltage power measurements at very low power factors is described. The quadrature component of the load current is automatically balanced in the current comparator against a quadrature current obtained from a slave supply, thereby reducing the stringent high accuracy requirement of the instrument when used for measuring power at a very low power factors. The current-comparator-based instrument according to the present invention has an estimated accuracy with respect to its readings of better than 3 percent at 0.001 power factor, 1 percent at 0.005 power factor and 0.5 percent at 0.01 power factor and higher. It features an internal high-voltage active-divider and displays to indicate source voltage, current, power factor and reactance of the load, in addition to the power.

REFERENCES:
patent: 4121150 (1978-10-01), Kelley, Jr.
patent: 4272723 (1981-06-01), Pullen
patent: 4300182 (1981-11-01), Schweitzer, III
patent: 4303881 (1981-12-01), Czerwien
patent: 4321529 (1982-03-01), Simmonds et al.
patent: 4459546 (1984-07-01), Arrington
patent: 4556843 (1985-12-01), Milkovic
patent: 4703387 (1987-10-01), Miller
patent: 4713608 (1987-12-01), Catiller
patent: 4749941 (1988-06-01), Halder

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