| 摘要 |
<p>PURPOSE:To obtain a current sensor which is easy to assemble, requires a small area to mount, has a high measuring accuracy and easily copes with to-be-detected currents of different sizes. CONSTITUTION:A current detector part 17 having through holes of a primary conductor of a three-phase circuit and a zero-phase current detector part 18 are coupled into one body. Three through holes are arranged concentrically, more preferably, at positions of vertices of a triangle. The primary conductor is disposed within the holes. Current outputs from windings 8, 9, 10 of a current transformer are, via a full-wave rectifier circuit 11, converted into voltage signals by a circuit of a plurality of resistors 27 connected in parallel and then output from a terminal 23. The resistors 27 are connected in an optional combination to an output part of the full-wave rectifier circuit 11 by a switch 22.</p> |
