Dc current monitor

Details Dc current monitor Dc current monitor

G - Physics

01

R

324/48, 324/59

G01R 19/165 (2006.01) G01R 15/18 (2006.01) G01R 19/00 (2006.01) G01R 33/12 (2006.01)

Patent

CA 2037790

A non-intrusive DC current monitor is presented which emulates the theoretical operation of an AC transformer. A conductor (10), 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 (12), 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 (20, 22) 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 (14) to be made.

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