| 摘要 |
PROBLEM TO BE SOLVED: To facilitate the installation of a current transformer by keeping distances between the respective current transformers at prescribed intervals, and storing them in the identical case with the primary orientations meeting each other. SOLUTION: Respective current transformers 7, 8 are stored in the identical case 22 so that orientations (polarities) may meet each other with a prescribed interval kept, and the current transformers 7, 8 may be integrally attached to the output terminal side of a main switch 4 on a substrate. A secondary resistor regulating the outputs of the current transformers 7, 8 individually is mounted on a printed circuit board and disposed between the respective current transformers 7, 8. The characteristic error of the respective current transformers 7, 8 in manufacturing process is regulated by the secondary resistor and stored in the case 22. An output line from the printed circuit board is passed from the case 22 to the outside and connected to a watthour meter 9. It is thus possible to facilitate the installation of the current transformers 7, 8 without need for the regulation of them on an installation site. |
