| 摘要 |
PURPOSE:To improve reliability on insulation among a shielding for relaxing an electric field and the neck sections of cooling ducts without damaging the field relaxing effect of the end section of a winding by notching one part of the shielding for relaxing the electric field for a section oppositely faced to the neck section of the cooling duct arranged on the outermost side in the cooling ducts incorporated into the winding. CONSTITUTION:Electrostatic shieldings 15 for relaxing an electric field are each mounted at upper and lower end sections on the outermost side of a high- voltage winding 5 consisting of a foil-wound winding. Cooling ducts 6 are incorporated into the high-voltage winding 5 in conformity with the rated capacity of the winding on its midway of the winding 5, and neck sections 7 projected from the high-voltage winding 5 are formed in order to cause a refrigerant to flow. One parts 16 of the electrostatic shieldings 15 of sections oppositely faced to the neck sections 7a disposed on the outermost side in the electrostatic shieldings 15 and the neck sections 7 are notched. Accordingly, insulating distances among the neck sections 7a of the cooling ducts 6 and the electrostatic shieldings 15 are ensured, thus improving reliability on insulation among the neck sections 7a of the cooling ducts 6 and the electrostatic shieldings 15.
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