| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a zero-phase current transformer that is improved to achieve a high equilibrium characteristics while employing a normal conductor for a penetration conductor part of a main cable way conductor penetrating an annular iron core. <P>SOLUTION: In this zero-phase current transformer used by being mounted on a ground-fault interrupter, a ground-fault protective relay or the like, and used for extracting a signal from a secondary wiring by making conductors 5R, 5N of respective phases of a main cable way penetrate an annular iron core 1 with the secondary winding wounded to detect a zero-phase current flowing to the main cable way, the conductors of the respective phases of the main cable way or the conductors of the other phases excluding that of one of the phases are divided into a plurality of penetration conductors 5R-1, 5R-2, 5N-1, 5N-2 to branch the current, and thereafter the penetration conductors of the respective phases are dispersively arranged at point-symmetrical positions with respect to a hypothetical center O defined at the in-hole center of the annular iron core 1. <P>COPYRIGHT: (C)2010,JPO&INPIT</p> |
