| 摘要 |
PCT No. PCT/AT91/00068 Sec. 371 Date Dec. 23, 1992 Sec. 102(e) Date Dec. 23, 1992 PCT Filed Jun. 7, 1991 PCT Pub. No. WO91/19304 PCT Pub. Date Dec. 12, 1991.A substation transformer is disclosed which includes a winding, a winding compression ring, which closes off the winding, a compression beam, and expanding spring elements. The expanding spring elements are disposed concentrically around a core portion of the winding, and are placed between the compression beam and the winding compression ring. Each of the spring elements includes a spring, a bushing receiving a spring, and a compression piston which has been provided to close an open end of the bushing. The compression piston is adapted to limit movement of the spring. A post-installation modification mechanism is provided which includes a compression mechanism for compressing the winding. The compression mechanism comprises hydraulic cylinders adapted to be removably inserted between the compression beam and the winding compression ring. Adjustment screws are provided within a threaded bore in a support surface of the compression beam, and allow adjustment of the pressure on the compression piston to thereby adjust the compression of disk springs. A stop is removably provided in the bushing to limit movement of the compression piston to thereby hold the disk springs in a pre-stressed state. |
