Method and apparatus for measurement of AC and DC electrical cur

Details Method and apparatus for measurement of AC and DC electrical cur Method and apparatus for measurement of AC and DC electrical cur

1994-06-30

1995-12-26

Wieder, Kenneth A.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Magnetic saturation

324117R, 324115, 324127, 324142, G01R 3300

Patent

active

054790956

ABSTRACT:
The present invention involves measurement of an electrical current by means of a current transformer having the current to be measured passing in an axial direction through the current transformer, and the voltage induced thereby in the windings of the current transformer are used to produce a first voltage. A Hall effect is used in series with the current transformer to produce a second voltage measurement corresponding to the current measured by the Hall effect sensor. When the two measurements agree to within a predetermined value (typically 5% of the root-mean-square current values measured by each sensor) then the current transformer reading is used as the more accurate. Otherwise, the Hall effect current sensor is used as the more accurate current measurement.

REFERENCES:
patent: 4682101 (1987-07-01), Cattaneo
patent: 5119073 (1992-06-01), Nelson et al.
patent: 5146156 (1992-09-01), Marcel
patent: 5181026 (1993-01-01), Granville

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