(19)
(11) EP 0 056 722 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
04.08.1982 Bulletin 1982/31

(43) Date of publication A2:
28.07.1982 Bulletin 1982/30

(21) Application number: 82300257

(22) Date of filing: 19.01.1982
(84) Designated Contracting States:
BE CH DE FR GB IT LI NL SE

(30) Priority: 19.01.1981 US 226331
19.01.1981 US 226332

(71) Applicant: WESTINGHOUSE ELECTRIC CORPORATION
 ()

(72) Inventors:
  • Lange, William J.
     ()
  • Gosser, Robert Benton
     ()
  • Perkins, John Frank
     ()
  • Davies, Norman
     ()

   


(54) Vacuum circuit interrupter with on-line monitoring apparatus


(57) A vacuum circuit interrupter has vapor deposition shields which is controlled by the circuit interrupter to produce a cold cathode ion detector for determining the quality or amount of vacuum within the vacuum circuit interrupter. The central shield support ring protrudes through an insulating casing to supply ion current to a current detecting bridge through a circumferentially insulated surge resistor and from there to the common terminal.






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