| 摘要 |
948,043. Electric capacitors. SIEMENS & HALSKE A.G. April 11, 1962 [April 12, 1959], No. 13929/62. Drawings to Specification. Heading H1M. An impregnated rolled capacitor of the selfhealing type comprises two strips of lacquered paper, or of synthetic material, on the surface of each of which a metal coating, e.g. aluminium or zinc, is deposited by vapour deposition to form a plate, a layer of lacquer being deposited upon each metal coating to seal the coating between two layers of lacquer, or a layer of lacquer and a strip of synthetic material, whereby the metal coatings are protected from decomposition products of the impregnant when dielectric failure occurs. The impregnant is a halogenated hydrocarbon, e.g. chlorinated diphenyl or chlorinated naphthalene, and is included in the capacitor between the adjacent strips of metal coated lacquered paper, or synthetic material; and one of the layers of lacquer, or the synthetic material, consists of material having an oxidation balance of at least 10% whereby during a dielectric failure the material forms stable non-conducting oxidation products which protect the layers of metal from conducting and corrosive products formed by the impregnant. When strips of synthetic material are used instead of lacquered paper the layers of metal are applied directly to the surface of the material. The oxidation balance of the lacquer applied to the paper, or that applied to the metal coatings, may be less than 10%. Examples of material having an oxidation balance of more than 10% are ethyl cellulose, benzyl cellulose, or polyethyleneterephthalate. |
