Low-voltage ascending flanged base structure of power transformer

A low-voltage ascending flanged base structure of a power transformer comprises a low-voltage ascending flanged base, a sealing bus cover, a movable flange and a fixing piece, the low-voltage ascending flanged base is welded and fixed to the position, close to the wall of a transformer oil tank, of the top of a transformer oil tank cover, and the fixing piece is arranged at the top of the low-voltage ascending flanged base. The outer diameter of the fixed part is larger than that of the low-voltage ascending flanged base and smaller than that of the transformer oil tank cover, a plurality of low-voltage sleeves are vertically arranged on the fixed part in an array mode, a penetrating through hole is formed in the center of the movable flange, and the movable flange covers the fixed part in the mode that the low-voltage sleeves penetrate through the penetrating through hole and is fixedly connected with the fixed part through bolts. The sealing bus cover covers the plurality of low-voltage bushings, and the bo