| 摘要 |
PURPOSE:To improve cooling efficiency and reduce the size of coil and thereby miniaturize a transformer as a whole by forming a coil of trasnformer with a hollow conductor insulated wire and directly cooling the conductor through the flow of coolant into such hollow part. CONSTITUTION:A transformer tank 1 which accommodates a transformer 5 is filled with insulation gas 2, a reservoir 4 for coolant 3 is provided at the lower part thereof and a disseminator 6 of coolant 3 is provided at the upper part of the body 5. This disseminator 6 and reservoir 4 are coupled with a pipe 7, a plurality of branching pipes 14 connected to the lead wire joint 15 are provided to the pipe 7 and a cooler 10 is provided at the outside of tank 1. A hollow conductor 12b-1 is wound as the conductor of coil 12 of this body 5 and moreover insulator 12b-2 is wound at the circumference of the hollow conductor 12b-1. The lead wire 11' of respective hollow conductors 12b-1 is connected to the pipe 14, the coolant 3 is caused to flow into the hollow conductor 12b-1, thereby the cooling efficiency of coil 12b is improved and the coil 12b and body 5 are reduced in size. |
