Current measuring and magnetic core compensating apparatus and m

Details Current measuring and magnetic core compensating apparatus and m Current measuring and magnetic core compensating apparatus and m

1987-03-04

1989-07-11

Smith, Jerry

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

With coupling means

324119, G01R 1900, G01R 1922

Patent

active

048475548

ABSTRACT:
DC magnetic flux bias imposed on a magnetic core of a current transformer is compensated in response to an indication of the amplitude and duration of opposite polarity secondary winding current components. In a second embodiment, the magnetic bias is compensated by responding to the integral of the secondary current. The integral of the secondary current is a measure of the magnetic core flux variations. The durations of the positive and negative flux variations are compared.

REFERENCES:
patent: 3708749 (1973-01-01), Bateman et al.
patent: 3714548 (1973-01-01), Macrander
patent: 4027235 (1977-05-01), Macrander et al.
patent: 4064449 (1977-12-01), Macrander
patent: 4182982 (1980-01-01), Wolf et al.
patent: 4255704 (1981-03-01), Milkovic
patent: 4255705 (1981-03-01), Milkovic
patent: 4278940 (1981-07-01), Milkovic
patent: 4513274 (1985-04-01), Halder
Carr, J. J., Digital Interfacing with an Analog World, 1978, pp. 100-1.

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