| 摘要 |
<p>PROBLEM TO BE SOLVED: To improve the impulse withstand voltage property and partial discharge property and restrain the thickness of an interlayer insulating material layer, by combining a material having an excellent impulse withstand voltage property and a material having an excellent partial discharge property to form an interlayer insulating material. SOLUTION: A dry type transformer V winding 11 has a high molecular insulating material 21a arranged on a bottom part and fiber insulating materials 21b, 21c stacked thereon in a stepped form, as an interlayer insulating material 21. Alternatively, as the interlayer insulating material 21 of the V winding 11, a fiber insulating material 21a may be arranged on the bottom part and high molecular insulating materials 21b, 21c may be arranged thereon in a stepped form. In the former case, in a portion where an interlayer generated potential is raised, the fiber insulating material is adjusted to a thickness to withstand a partial discharge starting voltage. In the latter case, since the high molecular insulating material has a sufficiently high withstand voltage with respect to an impulse voltage, the thickness can be restrained even when the interlayer generated potential is raised.</p> |
