Dc voltage/current heating/gelling/curing of resin...

H - Electricity – 01 – F

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H01F 41/12 (2006.01)

Patent

CA 2461276

An internal heating method for drying, gelling and final curing of epoxy resin insulation systems used for encapsulating dry type cast distribution transformer coils is disclosed. The internal method uses a Direct-Current (DC) power source to control and supply DC current to resistively heat the transformer coil encapsulated with a liquid resin under vacuum in a mold. DC current is applied to a given coil based on its conductor cross-sectional area and its epoxy resin quantity to achieve a specified temperature for drying, gelling and final curing. The temperature, controlled by DC resistive heating is maintained for a given period for each step.

L'invention concerne un procédé interne de chauffage permettant de sécher, gélifier et enfin durcir des systèmes d'isolation à base de résine époxy que l'on utilise pour encapsuler des bobines de transformateurs de distribution moulées de type sec. Le procédé interne utilise une source d'alimentation en courant continu (CC) pour réguler et fournir du CC pour chauffer de manière résistive la bobine de transformateur encapsulée sous vide dans un moule avec une résine liquide. Le courant CC est appliqué à une bobine donnée en fonction de l'aire transversale de son conducteur et de son volume de résine époxy pour atteindre une température spécifiée pour séchage, gélification et durcissement définitif. La température, régulée par chauffage résistif au CC, est maintenue à chaque étape pendant un certain temps.

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