Patent Number: 6,308,401

Title: Transformer coil and method

Abstract: An improved transformer coil of the type characterized as a shell-form or pancake coil used in large scale power transmission transformers. The improvement adds strength to resist lateral edge coil deformation as a result of handling the coil during transformer assembly and as a result of fault current surges. The improvement is directed to tightly spread tapeing some of the inner and outermost conductor turns together with preferably a heat shrinkable structural tape. This spread tapeing is periodic or spaced along the outer periphery of the coil for economy and may be staggered in terms of the number of conductor turns wrapped together. Preferably, the innermost conductor turns may also be spread taped in this same manner.

Inventors: Gress; Matthew L. (Palmetto, FL)

Assignee: Ohio Transformer

International Classification: H01F 27/28 (20060101); H01F 27/32 (20060101); H01F 007/06 ()

Expiration Date: 10/30/2018