| 摘要 |
<p>It is an object of the present invention to provide a DC current sensor having, a relatively simple construction and a good detecting capability even for microscopic current variation such as DC leakage breaker and the like, particularly, it is an object to provide a DC current sensor which is versatile and easy to mount to a wired lead. A lead wire being detected 1 is disposed through a strip type detecting core 2 constituted by, an integrated U-shaped detecting core member 2b, I-shaped detecting core members 21a,21b and opposite portions 52a,52b,52c,52d of an exciting core 4 consisting of four pieces of substantially rectangular cylindrical core members 4a,4b,4c,4d disposed oppositely via the detecting core members 21a,21b, whereby, against a magnetic flux PHI produced in the detecting core 2 by a DC current flowing through the lead wire 1, by using a magnetic flux, which is produced by an AC current of frequency f0 in existing coils 5a,5b wound around adjoining portions 51a,51b and 51c,51d of the exciting core members 4a,4b,4c,4d for negative-phase excitation, a magnetic gap is formed periodically by the opposite portions 52a,52b,52c,52d forming a core intersection of the exciting core, which is connected substantially perpendicularly to a circumferential direction of the detecting core members, to modulate the magnetic flux PHI 0 by 2f0 for detecting an electromotive force proportional to the DC current I flowing through the lead wire being detected 1 from the detecting coil 3 wound around the exciting core 4. <IMAGE></p> |
