Patent ID: 7746082
Filing Date: 2010-06-29
Classification: G01R

Abstract:
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.