DC CURRENT SENSOR

摘要

The present invention is directed to a DC current sensor which comprises a detecting core of an annular soft magnetic material, and a detecting coil wound in a toroidal shape around the detecting core. A wire to be detected is positioned through the detecting core and powered with a DC current. The DC current sensor includes means for periodically forming a magnetic gap at a portion of the detecting core by magnetic flux generated substantially perpendicularly against a circumferential magnetic flux generated in the detecting core by DC current flowing through the wire. The DC current sensor of the present invention is used in a DC leakage breaker. It has a simple construction and a good detecting capability for very small current variations.