| 摘要 |
PROBLEM TO BE SOLVED: To provide a zero-phase transformer capable of improving durability by preventing impairment of a coil, even if an external force such as vibration or impact acts, or heat acts due to ambient temperature change.SOLUTION: An annular case 19 of a zero-phase current transformer 10 is a member of H-shaped cross-section including an inner cylindrical wall 20, an outer cylindrical wall 21 located on the outside of the inner cylindrical wall, and an annular coupling plate 22 coupling these inner and outer cylindrical walls. The coil 12 and a first shield plate 13 are superposed and housed in an annular first housing space S1 surrounded by one surface of the annular coupling plate, inner cylindrical wall, and outer cylindrical wall, and a second shield plate 14 is housed in an annular second housing space S2 surrounded by the other surface of the annular coupling plate, inner cylindrical wall, and outer cylindrical wall.SELECTED DRAWING: Figure 4 |
