| 摘要 |
PURPOSE:To provide a transformer with large capacity and dielectric strength, and freed from cavitation and static electricity discharge, by a method wherein both end portions of a cooling duct are put out of both ends of a leaf coil insulating sheet and expanded in the circumferential direction. CONSTITUTION:A cooling duct 7 has expanded tubiform portion 17 at the both ends, so refrigerant carriers gather from all over the liquid path 19 to the cubiform portion 17 of which sectional area is large. The refrigerant carriers, then, flow out to a insulating pipe 12 via a joint 21. Due to this large sectional area of the cubiform portion 17, the flowing speed of the refrigerant carriers around the joint 21 can be lowered, and cavitation and static electricity discharge used to be caused by increment of the refrigerant carriers flowing speed can be prevented, as well as the cooling duct is protected from erosion. |
