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POTENTIAL INDICATOR FOR HIGH VOLTAGE SWITCHGEAR

  • US 3,744,045 A
  • Filed: 12/24/1970
  • Issued: 07/03/1973
  • Est. Priority Date: 12/24/1970
  • Status: Expired due to Term
First Claim
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1. A voltage presence indicator comprising a gas discharge tube, said gas discharge tube being capable of producing light in the presence of an electric field created by an associated voltage without being directly connected to said source of voltage, a light conducting channel disposed adjacent to said gas discharge tube and extending to a location away from said gas discharge tube, said channel being capable of transmitting said light, said light transmitted by said channel being adapted to indicate the presence of said electric field at said location away from said gas discharge tube, an electrical conductor disposed adjacent to said gas discharge tube, and a region of common electrical potential disposed in the vicinity of and spaced from said conductor, any voltage difference applied between said conductor and said region of common potential creating said electric field, said gas discharge tube comprising a pair of terminals, one of said terminals being capacitively connected to said conductor, the other of said terminals being capacitively connected to said common region, said channel comprising a fiber optics bundle, said fiber optics bundle having a light receiving end and an indicating end, said light entering said fiber optics bundle at said receiving end and leaving it at said indicating end, a combination electrically conducting support piece-capacitor plate, electrically insulating material surrounding said electrical conductor, said combination support piece-capacitor plate being disposed adjacent the outer portion of said electrically insulating material, said combination support piececapacitor plate having electrically connected thereto said one terminal of said gas discharge tube which is capacitively connected to said conductor, said combination support piececapacitor plate enhancing the capacitive coupling between said one terminal and said conductor and also supporting said gas discharge tube thereon.

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