Patent ID: 9728318
Date: 2017-08-08
CPC Classifications: H01F,Y10T

Claim:
1. A three-phase transformer for electrical supply transmission comprising a ferromagnetic, drum-type core where The core has holes or windows that extend in parallel to a longitudinal shaft of a drum to place the windings, The transformer has three pairs of windings, corresponding to a first, second and third phase, Each pair of windings has a primary and a secondary winding Characterized as follows: The core is composed of two main components: a central body and an air gap filling system The central body is composed of ferromagnetic sheets stacked one against each other, with several spaces or slots to place windings symmetrically distributed on the circle, where the spaces of the central body are trapezoidal in the edge of the circle, Windings are symmetrically distributed around the longitudinal shaft of the core and each winding crosses the longitudinal shaft of the core, and The air gap filling system consists of several trapezoidal ferromagnetic sheets that fit in the slots of spaces and close the magnetic circuit.