Alternating current sensor based on parallel-plate geometry and

Details Alternating current sensor based on parallel-plate geometry and Alternating current sensor based on parallel-plate geometry and

1994-11-21

1996-12-24

Nguyen, Vinh P.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

With coupling means

324126, G01R 104, G01R 3300

Patent

active

055876528

ABSTRACT:
A current sensor includes a first conductor plate, a second conductor plate positioned in spaced relationship relative to the first conductor plate and facing the first conductor plate, and a third conductor plate for electrically interconnecting the first and second conductor plates to form a connected conductive path along the first and second conductor plates. The first and second conductor plates are shaped to form respective magnetic field constituents around each of the first and second conductor plates during current flow along the conductive path. A sensing coil, such as one or more air-core coils, is provided for sensing changes in magnetic flux within a predetermined sense region. A shunt, such as a shunt plate or a suitably shaped conductive structure for shunting current, is further provided for diverting a portion of the current which flows along the conductive path to produce a magnetic field over a shunt region. The sense and shunt regions are nonoverlapping with respect to one another. A transformer, such as a current transformer, is magnetically coupled to the shunt to supply a predetermined level of electrical current which can be conveniently employed for electrically powering various circuits associated with the current sensor.

REFERENCES:
patent: 2724821 (1955-11-01), Schweitzer, Jr.
patent: 4182982 (1980-01-01), Wolf et al.
patent: 4492919 (1985-01-01), Milkovic
patent: 4580095 (1986-04-01), DeVries
patent: 4639665 (1987-01-01), Gary
patent: 4794326 (1988-12-01), Friedl
patent: 4894610 (1990-01-01), Friedl
patent: 4939448 (1990-07-01), Gudel
patent: 5066904 (1991-11-01), Bullock
patent: 5107204 (1992-04-01), Bullock et al.
"Split-Conductor Current Sensors with Electronic Load Termination", Miran Milkovic, IEEE Transactions on Instrumentation and Measurement, vol. 41, No. 4, Aug. 1992, pp. 540-547.
"Electrical Measurements" by Frank A. Laws, Massachuseets Institute of Technology, 1938, pp. 72-75.

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