Patent ID: 6563410
Filing Date: 2003-05-13
Classification: H01F

Abstract:
A power transformer exposed to a flow of gaseous oi liquid cooling medium, having heat dissipation by convection and comprising at least one winding structure on a first core leg and at least one other winding structure on at least one other core leg, each said winding structure having at least one heat transfer surface and warming up through energy losses generated by currents flowing through said winding structure, the improvement comprising:(a) winding structures on said first core leg being superimposed over winding structures on at least one other core leg in vertical relation for creating a small footprint transformer, (b) at least one baffle positioned between said superimposed winding structures, diverting the preheated part of the flow of said cooling medium away from upper winding structures, said part being preheated by lower winding structures, and guiding flesh cooling medium toward said heat transfer surface of at least one of said upper winding structures (c) whereby said winding structures receive fresh cooling medium, resulting in even temperature rise in said winding structures, and said transformer can be installed on a smaller floor space having small footprint.