| 摘要 |
<p>PURPOSE:To provide a high sensitive DC current sensor which has excellent detection ability of detecting the change of even a feeble current in a DC earth leakage breaker by making the best use of the storing point that the structure is relatively simple that a Hall element method has. CONSTITUTION:A detection core 11 consisting of a soft magnetic material consists of a annular core having a current detector 15 wound in spiral shape, and there a gap 12 is made, an a Hall element 13 is arranged, which has specified magnetoelectric conversion characteristic. Accordingly, a lead wire 14 to be detected itself passes straight through inside the current detector 15 wound in spiral shape, but a magnetic flux B corresponding to the magnetomotive force NI determined by the product of the DC current I and the number of windings N of the current detector 15 occurs inside the detection core 11, and the a magnetic field H is made in a gap 12, so the detection of the feeble current flowing in the objective lead wire 14 to be detected becomes possible by detecting the relation between the DC current I flowing in the lead wire 14 and the Hall output voltage VH in advance.</p> |
