Capacitive voltage dividers for medium voltage

专利名称：Capacitive voltage dividers for medium

voltage

发明人：AVOCAT, JEAN PAUL申请号：EP81400966.8申请日：19810617公开号：EP0042788B1公开日：19841121

摘要：1. Medium tension capacitive voltage divider comprising a capacitor whereof theplates (19, 22) are moulded in an insulating material and presenting surfaces having asmall radius of curvature directed towards each other, characterized by the combinationof : a) a first plate (19) constituted by at least one flat thick disc, comprising roundededges with a radius of curvature greater at all points than the value which is able to bringaobut a dangerous dielectric overload of the insulating material and which depends onthe admissible electrical gradient in the latter, the said first plate (19) bein supported bya conducting cylindrical coaxial rod (20) connected to a terminal (30) corresponding tothe first plate (19), possible by at least a second rod (29) connected by screwing to thefirst rod (20) ; b) a mass of solid dielectric material (21) moulded around said first plate(19) and the point where the support rod (20) is connected to the disc, the outer surfaceof this dielectric material being at all points at a nearly constant distance from this firstplate (19) and from its rod (20) except in the vicinity of the central part of the supportrod (20) where this material forms a neck (24) with rounded lobes (25, 26) surroundingthe said rod and a re-entrant portion (27) along the rod, the section comprising the axisof the rounded rod connecting the dielectric material (21) to the first lobe (25) having a

radius of curvature greater than that which is able to bring about a dangerous dielectricoverload of the insulating material ; c) a second plate (22) constituted by a conductinglayer covering the outer surface of the mass of dielectric material (21), with the exceptionof the neck (24) comprising the lobes (25, 26) and stopping after a first groove, at thebeginning of the convex region of the first lobe (25), thus containing an electrical

deflector, the said second plate (22) being connected to a conducting wire (33) connectedto a second terminal (32) corresponding t othe second plate (22) ; d) a solid outerinsulating mass (23) of synthetic resin or elastomer covering the mass of dielectricmaterial (21) and the second plate (22) by being moulded around the latter and exposingexternally : - the two terminals (30, 32) of the plates (19, 22), whereof one axial terminal(30) serves as a support with a srew thread (31), and - an axial support (34) with a screwthread (35) embedded in the insulating mass (23), this insulating mass (23) forming part ofa piece of electrical equipment such as a support insulator or a current or voltagetransformer.

申请人：AVOCAT, JEAN PAUL

地址：4, rue Philippe Lebon F-59500 Lambres-lez-Douai FR

国籍：FR

代理机构：Ecrepont, Robert (FR)

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