Single coil constitutive of windings for air-core transformers

Details Single coil constitutive of windings for air-core transformers Single coil constitutive of windings for air-core transformers

H - Electricity

01

F

H01F 27/32 (2006.01)

Patent

CA 2264703

The single coil (27) has a straight cross section generally square or rectangular in shape and comprises an insulating resin shell (29) encapsulating an assembly of serial turns (30) formed by a wire conductor (2) with dielectric sheath (3), coiled in layers of longitudinal or radial turns, the number of which is based on the thickness of the sheath (3) such that the voltage between two contiguous turns but most distant electrically does not exceed, for a set input voltage of the coil, a breakdown voltage value (Td) supplied by the application in the air of Paschen's law to the said sheathed conductor. In particular complete windings (38) for air-core transformers can thereby be produced by simply stacking single coils of this type, while retaining air as dielectric medium in the spaces between the turns.

La bobine annulaire (27) selon l'invention a une section droite de forme générale carrée ou légèrement rectangulaire et comprend une coquille de résine isolante (29) encapsulant un ensemble (28) de spires en série (30) formée par un conducteur filaire (2) à gainage diélectrique (3), bobiné en couches de spires longitudinales ou radiales, dont le nombre est déterminé en fonction de l'épaisseur du gainage (3) de façon que la tension entre deux spires jointives mais les plus éloignées électriquement n'excède pas, pour une tension d'entrée donnée quelconque de la bobine, une valeur de tension disruptive (Td) fournie par application dans l'air de la loi de Paschen audit conducteur gainé. On peut alors notamment construire des enroulements complets (38) pour transformateurs secs par simple empilage de bobines élémentaires de ce type, tout en conservant l'air comme milieu diélectrique dans les espaces inter-spires.

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