| 摘要 |
PURPOSE:To prevent over heat and to offer a separate-type transformer effectively applied to a large-capacity transformer by a method wherein an increase in current density by winding leakage magnetic flux at both end sections of the metal sheets of foil windings is controlled. CONSTITUTION:A low-voltage winding 4 and a high-voltage winding 5 are composed of foil windings wound by superposing metal sheets 7 and insulating sheets 8. An insulating cylinder 3 and an insulating barrier 6 are provided between the low-voltage winding 4 and an iron core 2, and at the gap between windings 4, 5 respectively. Cooling ducts 9 are positioned in concentric circle shape in the inside of each winding 4, 5 at predetermined intervals. In the low- voltage winding 4 and the high-voltage winding 5 contained the cooling ducts 9 composed in this way, leakage magnetic flux in the windings is absorbed to silicon steel plates 15, 15 forming the cooling ducts 9, and eddy current by leakage magnetic flux crossing the silicon steel plates 15, 15 is hardly occurs at both the end sections of the metal sheets 7 to generate no local over heat. |
