Current measuring device

Details Current measuring device Current measuring device

1993-05-24

1994-09-06

Nguyen, Vinh

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Magnetic saturation

324127, G01R 1900

Patent

active

053451694

ABSTRACT:
A current measuring device includes first and second current transformers, having each a magnetic core, a primary conductor or winding and a secondary winding coupled with the magnetic core, the primary windings or conductors being connected to carry the current to be measured. The secondary windings of the first and second transformers have an equal number of turns and are connected in series with each other, and arranged so that the currents induced in the secondary windings by the current to be measured flow in the same direction. A current generator has an output connected to the secondary winding of the first current transformer for feeding to the same a current comprising a magnetizing current component capable of driving the corresponding core, alternately, in opposite states of saturation. A device is provided for controlling the generator by the magnetizing current component, and measuring device are provided for measuring the current flowing in the secondary winding of the second current transformer, which is proportional to the current to be measured.

REFERENCES:
patent: 3714544 (1973-01-01), Kelly, Jr. et al.
patent: 4274051 (1981-06-01), Condon
patent: 4616174 (1986-10-01), Jorgensen
patent: 4899103 (1990-02-01), Katzenstein
patent: 5008612 (1991-04-01), Otto

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