DC current monitor

Details DC current monitor DC current monitor

1990-03-09

1991-10-01

Wieder, Kenneth

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Magnetic saturation

324126, 324127, G01R 122, G01R 3300

Patent

active

050536958

ABSTRACT:
A non-intrusive DC current monitor is presented which emulates the theoretical operation of an AC transformer. A conductor, carrying the current to be measured, acts as the primary of a DC current transformer. This current is passed through the center of a secondary coil, and core positioned thereabout, and produces a magnetic flux which induces a current in the secondary proportional to the current flowing in the primary. Means are provided to periodically "reset" the transformer core such that the measurement inaccuracies associated with core saturation are obviated. A reset current is caused to periodically flow through the secondary coil which produces a magnetic flux oppositely polarized to the flux created by the current in the primary, thus allowing ongoing measurements to be made.

REFERENCES:
patent: 3699442 (1972-10-01), Riley
patent: 3768011 (1973-10-01), Swain
patent: 4276510 (1981-06-01), Tompkins et al.
patent: 4298838 (1981-11-01), Akamatsu et al.
patent: 4374359 (1983-02-01), Missout
patent: 4454553 (1984-06-01), Iwasaki
patent: 4682100 (1987-07-01), Hagelin
patent: 4682106 (1987-07-01), Vatis et al.
patent: 4899103 (1990-02-01), Katzenstein
patent: 4914383 (1990-04-01), Wilkerson

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