| 摘要 |
PURPOSE:To improve magnetic field shielding effect, reduce loss, prevent local heating and also improve tank strength by providing a duct for extending a high voltage leas to the side wall of tank of transformer, extending an intermediate voltage lead with two ducts and connecting it to the 3-phase on-load tap exchanger provided within th tank independent of the tank of transformer. CONSTITUTION:A high voltage lead 3 in the high voltage side of transformer is extended through a duct 4 from the area between coils 2b of each phase, namely from the inter-phase position from the long side wall 1a of transformer tank. Meanwhile, in the intermediate voltage side, an intermediate voltage lead 7 is extended through two ducts 6 located between the coil 2b of center phase and the coil 2b of both side phases and is connected to LTC9 accommodated in the integrated LTC tank 16 of 3-phase. Such intermediate voltage lead is then extended by the intermediate voltage bushing 10. Since the ducts 4, 6 are provided between the coils 2b of each phase as explained above, the magnetic shield plate 13 provided at the internal surface of long side walls 1a, 1b can be provided at the position corresponding to the front side of coil 2b. Thereby sufficient magnetic shielding effect can be obtained, loss can also be reduced and generation local heating can also be prevented. |
