Transformer with improved liquid cooled disc winding

Claim 1

A force cooled electrical transformer comprising a tank containing liquid insulating coolant in which is immersed at least one vertically oriented magnetic core element and associated surrounding flat coil winding, said flat coil winding being comprised by a stack of approximately equal sized flat coils grouped into a plurality of coil sections, each coil section comprising several of said flat coils unequally vertically spaced from one another with a graduated coil spacing which decreases in the direction from the lowermost to the uppermost flat coil in each section, to thereby obtain a relatively uniform velocity of coolant flow between said coils, a pair of continuous duct walls respectively mounted inside and outside said flat coil winding to define inner and outer vertical cooling ducts, and staggered horizontal baffle means alternately completely blocking said inner and outer vertical cooling ducts between said coil sections, and means for recirculating and pumping said coolant to flow upwardly through said vertical cooling ducts and horizontally between the several unequally spaced flat coils in each coil section respectively inwardly and outwardly in successive coil sections as directed by said staggered horizontal baffle means.