JPS63174420U - - Google Patents

Abstract

1. A winding for an air-cooled transformer or reactor comprising at least two winding layers and having the following structure : the innermost winding layer (1) extends continuously across the full axial length of the winding ; the winding layers (2, 3 ...) joining said innermost winding layer in radial outward direction are formed of a pair of essentially equally long sections (10, 11) which are divided in a position equal to about one-half of the axial length, said section alternatingly electrically connected or coupled to the overlying and underlying winding layer or winding sections, respectively, in their axial end and central regions ; the winding layer (s) is (are) isolated from the other concentrically positioned winding layer (s) by hollow spaces froming cooling channels (18) ; bar-shaped spacers (6, 7) are disposed in said hollow spaces so as to extend in axial direction, characterized in that distributed with a spacing around the circumference in said cooling channels (18) and extending in the axial direction, a pair of axially aligned spacer element (6, 7) are each positioned in the region of the electrical connections between the winding layers of said winding sections (10, 11), with the length of each spacer element being about 0,1 to 0,3, preferably slightly more than 0,25, of the axial length ; and that a peripheral outwardly open air channel (20) is interposed between said winding sections in a position corresponding to about one-half of the axial length.

Description

[Brief explanation of the drawing]

FIG. 1 is a theoretical explanatory diagram showing a comparison between a conventional coil and a coil according to this invention, FIG. 2 is a cross-sectional view showing an embodiment of this invention, and FIG. 3 is a longitudinal sectional view of the same. 1... Innermost winding layer, 2, 3, 4... Outer winding layer, 6, 7... Spacer member, 10, 11... Partial winding, 12, 13... Connection wire.

Claims (1)

[Scope of utility model registration request] A coil for an air-cooled dry type transformer having at least two winding layers, wherein the innermost winding layer 1 is provided over the entire axial length of the coil, and the innermost winding layer is radially outward. Each of the winding layers 2, 3 is composed of a pair of partial windings 10, 11 of approximately the same length divided at a position approximately half the axial length, and each of the winding layers has an inner or outer winding layer. A rod-shaped spacer that is electrically connected alternately at the ends and the center of the shaft, each winding layer being concentrically spaced from another winding layer through a hollow part forming an air cooling path, and provided in the hollow part in the axial direction. A pair of spacer members 6, 7 groups are distributed in the circumferential direction within the air cooling path, and each spacer member pair is arranged in the electrical connection area between the winding layers of the partial winding, and each spacer member 6, 7 is The length is approximately 0 of the axial length
．． 1 to 0.3, preferably slightly larger than 0.25, and is characterized in that an air gap 20 opening outward on the circumferential surface is interposed between the partial windings at a position of approximately one-half of the axial length. Coil for air-cooled dry transformer.