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Coil assembly and support system for a transformer and a transformer employing same
| Details |
Inventors: VanSchaick, Thomas E.; VanDusen, Morris V.; Anderson, James M.;
Assignee: General Electric Company (Schenectady, NY)
Primary Examiner: Kozma; Thomas J.
Assistant Examiner:
Attorney, Agent or Firm: Squillaro; Jerome C.
A coil assembly includes a first winding for circumferentially surrounding at least a portion of a leg of a transformer core, a second winding spaced from and circumferentially surrounding at least a portion of the first winding, first supports, such as axially extending insulative rods, disposed between the first and second winding, for inhibiting axial motion of the second winding relative to the first winding and a second support disposed about at least a portion of the outer periphery of the second winding for inhibiting radial motion of the second winding relative to the first winding. Encapsulating material, such as an epoxy resin having glass fibers disposed therethrough, is disposed between the first winding and the leg, between the first and second winding and disposed about the second support for forming a monolithic structure. In a transformer including such a coil assembly, the leg and conductors forming the windings may be fluid cooled. In a method for forming a coil assembly, the encapsulating material is flowed from the bottom of the assembly to fill spaces and to avoid formation of bubbles therein before curing. |
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DETAILED DESCRIPTION Referring to FIG.
1, a transformer including a coil support system in accordance with the present invention is shown (mold 46 is removed for clarity and ease of understanding).
The illustrated transformer is a three phase transformer having coils 12, 14 and 16.
It is to be understood that the present invention is applicable to transformers having any number of coils, such as, for example, a single phase transformer.
Coils 12, 14, and 16, respectively surround at least a portion of and are disposed in magnetic flux communication with legs 22, 24 and 26 of a core 20 of the transformer.
Respective ends of legs 22, 24 and 26 are connected by yokes 21 and 23 of core 20.
As is generally recognized in the art, core 20 comprises a plurality of metallic laminations appropriately shaped registered and stacked to form legs 22, 24 and 26 and yokes 21 and 23 while avoiding seam concurrence of the laminations.
The laminations collectively define the primary magnetic flux path in the transformer.
The laminations of core 20 are registered to form windows 11 and 13, bounded by legs 22 and 24, and 24 and 26, respectively, and leg yokes 21 and 23 for receiving portions of coils 12, 14 and 16.
A pair of clamping channels, one of which is shown at 32, and another pair of clamping channels, one of which is shown at 34, have yokes 21 and 23 respectively disposed therebetween.
Clamping channels 32 and 34 are forcibly held together so that the laminations of yokes 21 and 23 are respectively tightly secured therebetween.
A respective pair of support plates 15, 17 and 19 are disposed between legs 22, 24 and 26 and clamping channels 32 and 34.
The tee-shaped ends of support plates 15, 17 and 19 are fitted into respective recesses in clamping channels 32 and 34 to enable the entire transformer to be lifted at clamping channels 32 without disrupting the relative positioning of the laminations, coils 12, 14 and 16, or clamping channels 34.
Referring to FIG.
2, a view looking in the directions of the arrows of line 2--2 of FIG
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Generators or Motors 
