| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a zero-phase current transformer having a magnetic shield of stabilized characteristics.SOLUTION: A zero-phase current transformer includes an annular core 100 having soft magnetism, annular flat plate shields 105, 106 having soft magnetism, a cylindrical shield 104 having soft magnetism, and a detection coil 102. The detection coil 102 is wound toroidally around the core 100, and the core 100 has a permeability higher than those of the flat plate shields 105, 106 and the cylindrical shield 104. The core 100 and detection coil 102 are covered, at least partially, with the flat plate shields 105, 106, and the cylindrical shield 104 is a material continuous in the circumferential direction, and not having a start end and terminal end.</p> |
