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In-situ detection method of fault characteristic gas dissolved in transformer oil

An in-situ detection and transformer oil technology, applied in the direction of material excitation analysis, Raman scattering, etc., can solve the problems of large errors and multiple misjudgments of gas online monitoring equipment

Inactive Publication Date: 2017-07-11
CHONGQING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the commonly used gas chromatography, mass spectrometry, semiconductor gas sensor method, infrared absorption spectroscopy and photoacoustic spectroscopy must first carry out oil and gas separation, which causes large errors, many misjudgments and missed judgments in the current fault characteristic gas online monitoring equipment. one of the main reasons

Method used

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  • In-situ detection method of fault characteristic gas dissolved in transformer oil
  • In-situ detection method of fault characteristic gas dissolved in transformer oil
  • In-situ detection method of fault characteristic gas dissolved in transformer oil

Examples

Experimental program
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Effect test

Embodiment 1

[0030] The characteristic peak determination of embodiment 1 ethylene, acetylene, carbon dioxide, new transformer oil

[0031] Using a single-frequency single-mode fundamental transverse mode (TEM) with a wavelength of 532nm 00 ) laser to irradiate ethylene, acetylene, carbon dioxide, and fresh transformer oil with a relative purity of 99.99%, respectively, to obtain a Raman spectrum, with a laser power of 60 mW, an integration time of 10 s, and a slit width of 100 μm. See the test results figure 2 , image 3 , Figure 4 and Figure 5 , select 1344cm -1 It is the characteristic peak of ethylene, 1974cm -1 It is the characteristic peak of acetylene, 1388cm -1 It is the characteristic peak of carbon dioxide, 1470cm -1 is the characteristic peak of transformer oil.

Embodiment 2

[0032] The quantitative analysis curve of embodiment 2 ethylene, acetylene and carbon dioxide

[0033] Introduce ethylene, acetylene and carbon dioxide gas into the new transformer oil, and measure it by high-precision gas chromatography to obtain a standard oil sample with an ethylene concentration of 10uL / L, an acetylene concentration of 2uL / L, and a carbon dioxide concentration of 100uL / L. 15uL / L, acetylene concentration of 4uL / L, carbon dioxide concentration of 200uL / L standard oil sample, ethylene concentration of 20uL / L, acetylene concentration of 6uL / L, carbon dioxide concentration of 300uL / L standard oil sample, ethylene concentration Standard oil sample with 25uL / L, acetylene concentration of 8uL / L, and carbon dioxide concentration of 400uL / L, standard oil sample with ethylene concentration of 30uL / L, acetylene concentration of 10uL / L, and carbon dioxide concentration of 500uL / L.

[0034] Using a single-frequency single-mode fundamental transverse mode (TEM) with a wa...

Embodiment 3

[0038] Concentration measurement of dissolved fault characteristic gas in embodiment 3 transformer oil

[0039] Take a transformer oil sample to be tested and detect it by high-performance gas chromatography. The concentration of ethylene is 8.00 μL / L, the concentration of acetylene is 2.29 μL / L, and the concentration of carbon dioxide is 357.41 μL / L.

[0040] according to figure 1 The shown device uses a single-frequency single-mode fundamental transverse mode (TEM) with a wavelength of 532nm 00 ) laser irradiates the transformer oil sample to be tested, improves the signal-to-noise ratio through high-pass filter filtering and spatial filter unit, uses the Raman spectrum acquisition device to obtain the Raman spectrum spectrum of the transformer oil sample to be tested, the laser power is 60mW, and the integration time is 10s. The slit width is 100 μm, see the results Figure 9 , choose 1344cm -1 It is the characteristic peak of ethylene, and the characteristic peak area i...

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Abstract

The invention belongs to the technical field of fault diagnosis of electrical equipment and relates to an in-situ detection method of fault characteristic gas dissolved in transformer oil. According to the method, single frequency single-mode-based transverse mode (TEM00) laser having wavelength of 532 nm irradiates a standard oil sample, the laser passes through a first high-pass filter and a space filter unit and then passes through a second high-pass filter and a lens, a Raman spectrum acquisition device acquires a standard oil sample Raman spectrogram, and after modeling, ethylene, acetylene and carbon dioxide concentrations in the oil sample to be detected are determined without oil and gas separation. The method has high accuracy and simple processes, can directly detect concentration of multiple fault characteristic gas dissolved in transformer oil and improves the accuracy of fault prediction.

Description

technical field [0001] The invention belongs to the technical field of fault diagnosis of electrical equipment, and in particular relates to an in-situ detection method for dissolved fault characteristic gas in transformer oil. Background technique [0002] The insulating oil and insulating paper of the operating transformer will decompose under the action of various factors such as electricity, heat, and the environment, and produce various gases that reflect the nature of the fault and insulation performance, such as ethylene, acetylene, carbon dioxide, etc., and dissolve in the insulating oil. The characteristic gas analysis of dissolved faults in oil is one of the most effective methods recognized at home and abroad to judge the early latent faults of transformers. It is of great significance to accurately detect the trace fault characteristic gas dissolved in oil to ensure the safe and reliable operation of large transformers. However, the commonly used gas chromatogra...

Claims

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Application Information

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IPC IPC(8): G01N21/65
CPCG01N21/65
Inventor 陈伟根万福王品一李剑王有元杜林周湶王飞鹏
Owner CHONGQING UNIV
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