METHOD OF CONSTRUCTING A TRANSFORMER WINDING ASSEMBLY

• US 3,774,298 A
• Filed: 06/29/1972
• Issued: 11/27/1973
• Est. Priority Date: 06/29/1972
• Status: Expired due to Term

• Current Assignee: ABB Power T&D Co Inc (ABB Limited)
• Original Assignee: Edgar R. Eley
• Inventors: Eley, Edgar R.
• Primary Examiner(s): Lanham, Charles W.
• Assistant Examiner(s): Hall, Carl E.
• Application Number:
  US05/267,290
• Time in Patent Office: 516 Days
• Field of Search: 29/602,605 336/60,205,58,96,70 264/272
• US Class Current: 29/605
• CPC Class Codes: H01F 27/322 the insulation forming channels for circulation of the fluid
• CPC Class Codes: H01F 41/127 Encapsulating or impregnating encapsulating coil and core H01F41/005
• CPC Class Codes: Y10T 29/4902 Electromagnet, transformer or inductor
• CPC Class Codes: Y10T 29/49071 by winding or coiling

Abstract

Winding sections are assembled coaxially with one of the winding sections being of the encapsulated type. The encapsulated winding section is cast in a mold having depressions thereon which form projections on the surfaces of the encapsulated winding section. The projections separate adjacent winding sections from the encapsulated winding section and form spaces therebetween which permit the flow of cooling dielectric.

Claims

1. A method of constructing a transformer winding assembly comprising the steps of:

winding first, second and third winding sections, providing mold means having surfaces with depressions thereon, each of said depressions having a longitudinal dimension, placing said second winding section into said mold means with the axis of said second winding section parallel to the longitudinal dimensions of said depressions, encapsulating said second winding section while positioned in said mold means to provide an encapsulated winding section having integral projections on at least one side thereof, and assembling said winding sections coaxially, with said encapsulated winding section positioned around said first winding section and said third winding section positioned around said encapsulated winding section.

2. The method of constructing a transformer winding assembly of claim 1 wherein the mold means includes an outer mold portion and an inner mold portion, the depressions existing only on the outer mold portion to provide an encapsulated winding section having integral projections on only the outside thereof.

3. The method of constructing a transformer winding assembly as claim 1 wherein the mold means includes an outer mold portion and an inner mold portion, the depressions existing only on the inner mold portion to provide an encapsulated winding section having integral projections on only the inside thereof.

4. The method of constructing a transformer winding assembly of claim 1 wherein the mold means includes an outer mold portion and an inner mold portion, the depressions existing on both said inner and outer mold portions to provide an encapsulated winding section having integral projections on both sides thereof.