Tank for a pad-mounted transformer and method of making same

Details Tank for a pad-mounted transformer and method of making same Tank for a pad-mounted transformer and method of making same

H - Electricity

01

F

H01F 27/00 (2006.01) H01F 27/02 (2006.01) H01F 41/00 (2006.01)

Patent

CA 2215757

A tank for a pad-mounted transformer comprises: (i) a casing that is C-shaped in cross section and comprises spaced-apart parallel arms of sheet form and a rounded back wall connecting the arms and (ii) a combined front wall and bottom that is of a generally-L-shaped cross-section when viewed from a first reference plane extending parallel to the arms. The front wall is spaced from the back wall to provide an interior space between these walls. The bottom when viewed from a second reference plane perpendicular to the first reference plane, has a rounded periphery that nests within the C-shaped casing. The combined front wall and bottom has a flange that extends around its periphery, abuts the interior surface of the C-shaped casing, and projects away from said interior space. The flange is roll seam welded to the casing by utilizing a welding machine comprising a pair of roller electrodes between whichwelding current passed as the roller electrodes move relative to the parts being welded. This welding operation is performed by causing the roller electrodes to roll along the length of the flange during the welding operation.

La cuve d'un transformateur en surface comprend : i) une enveloppe, dont la section transversale est en forme de C, et qui inclut des sections parallèles espacées en forme de feuilles reliées par une paroi arrondie et ii) une paroi avant et un plancher regroupés qui ont généralement une section transversale en forme de L lorsqu'ils sont vus d'un premier plan de référence parallèle aux sections. La paroi avant est éloignée de la paroi arrière pour former un espace intérieur entre les deux. Vu d'un deuxième plan de référence perpendiculaire au premier, le périmètre arrondi du plancher s'emboîte dans l'enveloppe en forme de C. La paroi avant et le plancher regroupés ont une bride qui court sur tout leur périmètre, aboute la surface intérieure de l'enveloppe en forme de C et fait saillie à partir de l'espace intérieur. La bride est soudée à la molette à l'enveloppe au moyen d'une machine à souder comptant deux molettes entre lesquelles le courant de soudage passe lorsque les molettes se déplacent par rapport aux pièces à souder. La soudure est obtenue en faisant rouler les molettes sur la longueur de la bride pendant le soudage.

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