(19)
(11) EP 1 103 988 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
02.01.2002 Bulletin 2002/01

(43) Date of publication A2:
30.05.2001 Bulletin 2001/22

(21) Application number: 00107732.0

(22) Date of filing: 11.04.2000
(51) International Patent Classification (IPC)7: H01B 17/28
(84) Designated Contracting States:
AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE
Designated Extension States:
AL LT LV MK RO SI

(30) Priority: 26.11.1999 IT MI992481

(71) Applicant: PASSONI E VILLA FABBRICA ISOLATORI E CONDENSATORI S.p.A.
20162 Milan (IT)

(72) Inventors:
  • Villa, Giorgio
    20124 Milan (IT)
  • Villa, Giancarlo
    20124 Milan (IT)

(74) Representative: Klausner, Erich et al
c/o Ufficio Internazionale Brevetti Ing. C. Gregorj S.p.A. Via Dogana 1
20123 Milano
20123 Milano (IT)

   


(54) SEmi-capacitance graded bushing insulator of the type with insulating gas filling, such as SF6


(57) A semi-capacitance graded bushing comprises a conductor (1) fixed in the upper part to a plate (2) of the head (3) and in the lower part by way of a movable contact (4) to the fixed electrode (5) of the gas-insulated bus-duct (6), an insulating capacitance body (7) formed by a winding of insulating material in which are inserted the conductive or semiconductive foils (8), and a tube (9) which is prolonged with respect to the insulating capacitance body (7) to function as an electrode which is duly screened with end rings (10), the insulating capacitance body (7) being supported by the flange (11) which is fixed with respect to the external porcelain (12) by way of a cemented collar (13). A glass fibre-reinforced resin tube (14) is disposed in the interior of the porcelain (12). The whole assembly is filled with insulating gas under pressure, generally SF6.
The capacitance, having as armatures the conductor (1) and the electrode (9) and as dielectric the gas, is in cascade relationship with the capacitance of the insulating capacitance body (7).






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