A strip wound induction coil with improved heat transfer and...

H - Electricity – 01 – F

Patent

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H01F 27/32 (2006.01)

Patent

CA 2322046

An improved low voltage winding for dry insulated transformer has its windings resin encapsulated. The winding is constructed with flexible sheet conductors wound coincident with an insulating sheet material. Insulating spacers provide a means to form air channels in the windings during the coil forming process. A sealant is applied to openings at the lower ends and along vertical seams of the coil prior to the resin impregnation and encapsulation process. This will prevent drainage of the resin during a curing cycle. The result is a coil that exhibits high short circuit protection due to the tightly bond sheet conductors which will prevent movement of the conductors during short circuit conditions and also increases the radial compressive strength of the coil.

L'invention concerne un enroulement basse tension amélioré, utilisé dans des transformateurs à isolement, et dont le bobinage est enrobé de résine. L'enroulement est formé de feuilles conductrices souples, enroulées de façon combinée avec une feuille d'isolation. Les séparateurs d'isolation permettent la formation de conduits d'aération dans le bobinage, lors du processus de fabrication de la bobine. On applique un matériau d'étanchéité aux orifices situés aux extrémités inférieures et le long des soudures verticales de la bobine, préalablement à l'imprégnation de résine et au processus d'enrobage. Ceci empêchera l'écoulement de résine lors d'un cycle de traitement. Il en résulte une bobine présentant une grande protection aux courts-circuits, grâce aux feuilles conductrices bien attachées, qui ne pourront pas bouger dans des conditions de court-circuit, et donc, augmenteront la résistance à la compression radiale de la bobine.

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