Partial discharge detection device
First Claim
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.
1 Assignment
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Accused Products
Abstract
The present invention provides a high-performance partial discharge detection device which is user-friendly and compact and which allows detection of the electromagnetic waves caused by partial discharge, over a wide bandwidth with a simple constitution and a favorable S/N ratio. The waveguide antenna which receives electromagnetic waves that leak from the insulating spacer is attached to the outer circumferential face of the insulating spacer. The waveguide antenna is constituted by a waveguide portion and a coaxial cable connector which is installed on the waveguide portion. The waveguide portion has a metal short-circuit plate provided at one end thereof, and an opening formed at the other end thereof, which covers part of the outer circumferential face of the insulating spacer.
15 Citations
6 Claims
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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:
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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. - View Dependent Claims (2, 3, 4, 5, 6)
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Specification