| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide an installation method for current transformer by which high measurement accuracy can be obtained. SOLUTION: A current transformer 1 composed of an annular coil is constituted, in such a way that one 4a of two parallel buses 4a and 4c, through which electric currents flows in the opposite directions in used as an object to be measured and wingings 3, are wound spirally around almost the whole peripheral surface of an annular core 2 coaxially arranged with the bus 4a and made of an insulating material, and then a lead-out section 31 which is not wound with the windings 3 and from which both ends of the winding 3 are led out is provided at part of the core 2 in the peripheral direction. Measurement errors caused by the presence of the lead-out section 31, which is a no-winding section, is reduced as compared with the conventional example by setting the position of the section 31 at a central angleθc in the large of 30 deg.-80 deg. of the winding 3 from the plane formed of the buses 4a and 4c.</p> |
