GB711009A - Electric transformers with pressure resisting casings - Google Patents

Abstract

711,009. Transformers. LICENTIA PATENT-VERWALTUNGS-GES. July 9, 1952 [July 27, 1951], No. 17321/52. Class 38(2) A dry, self-cooled electric transformer assembly comprises core limbs 4 which have an elongated rectangular cross-section and which are arranged in one row so that the short sides of two adjacent limbs face each other, windings 5 which closely surround the core limbs, two walls 3 so arranged that each closely faces the longer sides of the windings and a frame 1 which is arranged between the two walls to surround the transformer structure and is tightly connected to the lateral walls. The ratio of the shorter to the longer 'sides of the crosssection of the core limbs 4 is preferably between 1:2 and 1:2.5. Between the windings 5 and the walls 3 which normally exert a pressure on the windings layers 7 of mica may be inserted also if required an asbestos layer. The lead-in conductors 6 may occupy the wedge-like spaces between the windings 5 and any spaces which may exist in the assembly filled with quartz sand. Terminal boxes 8 are provided at the ends of the assembly, and the walls 3 provided with cooling ribs 2.