H - Electricity – 01 – F
Patent
H - Electricity
01
F
H01F 27/00 (2006.01) H01F 27/08 (2006.01) H01F 27/22 (2006.01)
Patent
CA 2285806
The dry-type transformer according to the invention, with matched concentric phase windings (the "High-voltage" being usually placed externally) immersed in a block of dielectric resin, is characterized in that the external surface (11) at least of the block of resin (5) of the winding (1) disposed externally has metal cooling fins (10) having at least an electrical discontinuity according to the perimeter of the block (5) that supports them, and in that, between the said surface (11) and fins (10), a film (13) of electrically semi-conductive material, placed at a low constant potential, preferably that of the ground by means of a connection (14), covers the surface of the said block of dielectric resin (5), the bases (12) of the fins (10) being solidary with the said film (13). The invention improves cooling of dry-type transformers, thereby providing the possibility of creating devices of this type of reduced size and of greater power.
Le transformateur se caractérise par le fait que la surface externe (11) au moins du bloc de résine (5) de l'enroulement (1) disposé extérieurement est pourvue d'ailettes métalliques de refroidissement (10) présentant au moins une discontinuité électrique selon le pourtour du bloc (5) qui les porte, et que, interposé entre lesdites surface (11) et ailettes (10), un film (13) en matériau semi-conducteur de l'électricité, mis à un bas potentiel constant, celui de la terre de préférence au moyen d'un lien (14), recouvre la surface dudit bloc de résine diélectrique (5), les bases (12) des ailettes (10) étant solidaires dudit film (13). Ceci améliore le refroidissement des transformateurs secs.
Gastaldi Dominique
Sacotte Michel
Wild Jacques
France Transfo
Norton Rose Or S.e.n.c.r.l. S.r.l./llp
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