Means for controlling the leakage flux in transformers

Claim 1

An electrical transformer comprising a magnetic core and windings, the core having yokes and core legs, said windings being arranged around the legs, parts of the end faces of the windings being outside the yokes, a pressure beam on each of the two opposite sides of the yokes in line with the legs, each pressure beam having a flange perpendicular to said two opposite sides of the yokes, said flanges facing one end of the windings with a space between the flange and the corresponding end of the windings, leakage flux collecting means comprising at least one plate of laminated magnetic material situated in said space between the flange and an end of each of the windings, the laminations of said plate extending outward from the yoke at a substantial angle to the longitudinal direction of the pressure beam and extending substantially to the periphery of the windings, said collecting means covering the greater part of the end faces of the windings lying outside the yokes, a portion of the yoke which overlies the windings having at least one elongated recess therein opening towards the pressure beam and located in the inner part of the yoke so that outerparts of the yoke overlie the recess, the longitudinal direction of elongation of the recess being parallel to the longitudinal direction of the pressure beam, the end of the plate extending into and being supported in said recess.