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Dissolved gas analyzing method of electric power transformer oil based on Raman technology

A technology for dissolving gas and power transformers in oil, applied in the field of detection, can solve the problems of inflexible use, large volume and cost, and difficult on-site analysis.

Inactive Publication Date: 2005-07-27
上海众毅工业控制技术有限公司
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Problems solved by technology

For the analysis of medical systems, respiratory gases and other gases, the laser cavity method has advantages and high sensitivity. However, since the sample box must be placed in the laser cavity, the power, volume and cost are large, and it is not flexible to use. Difficult to use in field analysis

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Embodiment Construction

[0023] In order to better understand the technical solutions of the present invention, the following specific embodiments are further described.

[0024] The laser is used as the excitation light source to excite the gas to generate the Raman spectrum. The Raman spectrum of the gas was measured with a CCD spectrometer as a measuring tool. Finally, the results are compared to obtain the concentration of the gas. The East China standard gas sample is selected as the gas to be measured (in the case of no gas compression, the gas concentration is in the order of 10ppm), and the measurement spectrometers include HR640 single-channel spectrometer (as calibration) and CCD180 multi-channel spectrometer (as measurement). The implementation process is as follows:

[0025] 1. Measure the Raman spectrum generated by laser excitation of various gases

[0026] In addition to the seven gases of H2, CH4, C2H2, C2H4, C2H6, CO and CO2 dissolved in the transformer oil, generally in the proces...

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Abstract

A method for analysing gas dissolved in power transformer oil based on Raman technique includes measuring out Raman spectrum generated by exciting various gas with laser, calibrating methematical relation of each gas characteristic spectrum line position and concentration to spectrum intensity to obtain Raman spectrum wavelength and intensity as wavelength being a set valve and intensity being changed direct ratio with changing of concentration confirming gas concentration by comparing Raman spectrum line chart with characteristic spectrum line.

Description

technical field [0001] The invention relates to a detection method, in particular to a method for analyzing dissolved gas in power transformer oil based on Raman technology, which belongs to the technical field of detection. Background technique [0002] Large-scale power transformers are one of the most important and expensive equipment in power transmission and transformation systems. The quality of their insulation is related to whether the power system can operate safely and reliably. A large number of studies and practices on Dissolved Gas Analysis (DGA) in transformer oil at home and abroad show that the dissolved H in transformer oil 2 , CH 4 , C 2 H 2 , C 2 H 4 , C 2 H 6 , CO and CO 2 The ratio of the content of gas components, gas production rate and their content is reliable information reflecting the internal insulation state of the transformer, and can detect latent defects and faults of the transformer more sensitively and accurately. It is generally bel...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/25G01N21/47G01N21/53
Inventor 夏宇兴黄鞠铭高成岳杨虎
Owner 上海众毅工业控制技术有限公司
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