Folded bar current sensor

Details Folded bar current sensor Folded bar current sensor

G - Physics

01

R

324/59

G01R 19/00 (2006.01)

Patent

CA 1285025

FOLDED BAR CURRENT SENSOR ABSTRACT OF THE DISCLOSURE A current sensor employs a folded conductor bar having aligned holes therein to generate magnetic fluxes in the holes proportional to a current flowing in the bar. Each of the two holes has two windings therein wound in opposition to each other but connected for adding their voltages. Corresponding windings in the two holes are wound in opposition to each other and are connected for adding their voltages. The windings in each hole are offset from a center line, whereby magnetic fluxes generated by current flowing in the bar induce voltages in the coils but magnetic fluxes from external sources produce voltages which substantially cancel. A feedback arrangement is disclosed for creating an opposing magnetic flux such that essentially zero magnetic flux is present in the magnetic cores of the windings. A multi-range current measurement device employs a tapped feedback winding selectively connectable to an output amplifier for producing an output voltage having a range set by the number of turns selected on the tapped feedback winding.

561728

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