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Partial discharge detection device

  • US 7,746,082 B2
  • Filed: 12/03/2007
  • Issued: 06/29/2010
  • Est. Priority Date: 12/04/2006
  • Status: Expired due to Fees
First Claim
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1. A partial discharge detection device which is used in a gas-insulated equipment in which a high voltage conductor is supported by an insulator inside a hermetically sealed metal container charged with an insulating gas, and which detects partial discharge in the gas-insulated equipment, comprising:

  • receiving means for receiving electromagnetic waves which leak from the insulator;

    signal processing means for signal-processing the electromagnetic waves received by the receiving means; and

    signal processing determination means for determining, from the value of a signal that is signal-processed by the signal processing means, whether electromagnetic waves due to partial discharge generated inside the gas-insulated equipment are received,wherein the receiving means comprises a waveguide portion and a coaxial cable connector that is attached to the waveguide portion;

    the waveguide portion has a metal short-circuit plate at one end thereof, and an opening at the other end thereof, which is formed opposite the insulator;

    a coaxial cable for measurement is attached to the coaxial cable connector and the signal processing means is connected to the coaxial cable; and

    in the receiving means, the distance between the position of the coaxial cable connector and the opening of the waveguide portion is set at no more than ¼

    a cut-off wavelength of the waveguide portion.

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