| 摘要 |
PURPOSE:To decrease eddy currents generated on the winding surface resulting in the reduction of heat generation by a method wherein, when winding a metallic sheet around an iron core leg into a transformer by interposing a sheet insulator, a foil winding is constituted by joining a plurality of band metallic foils in a mesh form, and the band metallic foil in an axial direction is constituted of material with conductivity inferior to the band metallic foil in the circumferential direction. CONSTITUTION:Around the leg 1 of the iron core, the metallic sheet 2 is wound in many turns via the sheet insulator 3, and accordingly a low pressure winding 4 and a high pressure winding 5 are formed. Thereat, a cylindrical cooling duct 6 along the winding direction of the winding is interposed between these foil windings, then a coolant is circulated thereinto and condensed by using a condenser 8 with a built-in water cooling pipe 9 and liquified. In this constitution, the metallic sheet 2 is joined into a mesh form by using band metallic foils 2a and 2b several mm.-several 100mm. thick. For the winding in the circumferential direction Y, a metallic foil 2a such as Cu and Al with good conductivity is used, and, for one in the axial direction X, a metallic foil 2b such as stainless with inferior conductivity is used. |
