| 摘要 |
PROBLEM TO BE SOLVED: To shorten the distance between each current transformer and a zero-phase current transformer by giving an elliptical shape having an elliptic insertion hole to the zero-phase current transformer and inserting a three-phase power cable in one united body to the insertion hole without bending. SOLUTION: A zero-phase current transformer 11 has an elliptical shape or a so-called track shape, in which an elliptic insertion hole 12 is formed, and is attached to an attaching plate 13 as the same as that of the current transformer 8 of each phase located above in the panel of a unit 1. And a power cable 7 from each cable head 6 is inserted to each current transformer 8 respectively, three power cables 7 are inserted to the insertion hole 12 of the zero-phase current transformer 11 in one united body without being bent and are led out upward. By doing this, it is not necessary to bend the power cables 7 at both sides and thus the distance between each current transformer 8 and the zero-phase current transformer 11 can be shortened and the zero-phase current transformer 11 can be housed within the panel of the unit 1. |
