Patent ID: 8181334
Filing Date: 2012-05-22
Classification: B29C,B29L,H01F,Y10T

Abstract:
1. A method for producing windings for a dry-type transformer which includes a low voltage (LV) winding and a high voltage (HV) winding, the method comprising: electrically insulating the LV and HV windings from one another such that layers of the LV and HV windings are electrically insulated from one another by virtue of, initially, the LV winding being produced from electrically conductive wire or tape material and an insulating layer including resin-impregnated fibre material being wound around the LV winding, and the HV winding then being formed on top of said LV winding, such that the individual layers of the HV winding are each insulated from one another by means of resin-impregnated fibre rovings; prior to application of the HV winding, determining a maximum insulating thickness required for the layer insulation and the number of fibre rovings corresponding to the insulating thickness; and producing each winding layer and the associated insulating layer simultaneously with a physical offset with respect to one another, and setting the required insulating thickness both via the number of fibre rovings and via the winding feed of the fibre rovings, wherein in order to produce the winding, fibre polymer layers formed from fibres and a solid polymer matrix are applied alternately and repeatedly, as layers of insulation, simultaneously with the winding conductor between the individual winding layers of the winding, and once the fibre/polymer layers have been applied to the individual winding layers, the finished winding is subjected to a curing operation, such that the prepregs applied to the winding are cured.