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High-frequency wide-band local discharging on-line monitoring method in gas insulation converting station

A partial discharge detection and partial discharge technology, applied in the electrical field, can solve the problems of low acquisition rate, low storage depth, missing discharge information, etc., and achieve the effect of scientific and effective analysis

Inactive Publication Date: 2005-12-07
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The analysis method is relatively traditional. At the same time, if the usual measurement method is used in the phase spectrogram measurement system, the acquisition rate is not high, the storage depth is not high, and the discharge information will be missed.

Method used

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  • High-frequency wide-band local discharging on-line monitoring method in gas insulation converting station
  • High-frequency wide-band local discharging on-line monitoring method in gas insulation converting station
  • High-frequency wide-band local discharging on-line monitoring method in gas insulation converting station

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Embodiment Construction

[0032] The present invention will be further described in detail below in conjunction with the accompanying drawings and the embodiments given by the inventor.

[0033] The GIS high-frequency broadband partial discharge on-line monitoring method constructed according to the method of the present invention mainly consists of the following parts, combining figure 1 To elaborate:

[0034] 1) External partial discharge detection device

[0035] High-frequency broadband external partial discharge detection device 2, the main body is a broadband detection antenna with a frequency range of 10MHz to 3000MHz, one end of the antenna has a matching impedance of 50 ohms, and one side has an SMA high-frequency coaxial connector for feeding. The antenna is placed in a packaging box made of epoxy board. One side of the packaging box has a gap with a length of 400 mm and a width of 10 mm. When in use, this side faces the gap between the disc insulator 1 and the metal shell. The device does ...

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Abstract

In the method, partial discharge signal detection is carried out by external set-superwide frequency detection unit, long-distance transmission of detected signal is achieved by high frequency coaxial cable, multiple gate of signal and amplification-attenuation of variable gain is done by signal regulation unit of wide frequency, isngal from regulation unit is collected by data collection card and oscilloscope through I / O card and GPIB card under monitoring software control, and finally analysis and diagnosis of high frequency method and statistic method for collected data are carried out.

Description

technical field [0001] The invention belongs to the field of electrical technology, and relates to on-line monitoring of partial discharge in gas-insulated substations, in particular to an on-line monitoring method for high-frequency broadband partial discharge in gas-insulated substations. Background technique [0002] Various defects of gas insulated substations (GIS. hereinafter referred to as GIS) will cause various forms of partial discharge, such as corona, discharge of impurities, internal air gap discharge of epoxy support insulators, etc. The partial discharge pulse signal is transmitted in the form of TEM wave in GIS. The electromagnetic wave signal can be detected by the partial discharge monitoring sensor installed inside or outside the GIS equipment, and then the online monitoring of the partial discharge state of the GIS insulation structure is carried out. The partial discharge pulse causes the detection device to resonate at a certain frequency, and the reson...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/02H01H9/50H01H33/26
Inventor 成永红陈玉谢小军朱哲蕾胡学胜
Owner XI AN JIAOTONG UNIV