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Method for detecting furfural content of transformer oil

A technology for transformer oil and furfural is applied in the field of detecting furfural content in transformer oil, which can solve the problems of small insulating oil, the concentration of dissolved furfural cannot meet the requirements of industrial indicators, interference, etc. Mann high intensity effect

Inactive Publication Date: 2019-11-15
CHONGQING UNIV +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, limited by the weak intensity of Raman scattered light, it is only about 10 of the incident light intensity. -6 Due to the small molecular Raman scattering cross-section and the interference of insulating oil, the direct detection of the concentration of dissolved furfural in oil by Raman spectroscopy cannot meet the requirements of industrial indicators.

Method used

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  • Method for detecting furfural content of transformer oil
  • Method for detecting furfural content of transformer oil
  • Method for detecting furfural content of transformer oil

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Embodiment 1: prepare standard oil sample

[0025] Under the condition of avoiding light, dissolve excessive pure furfural in pure transformer oil, stir it magnetically for 5 minutes, and let it stand for 5 hours to prepare a furfural-saturated oil solution. The concentration of furfural in the solution is 353 mg / L.

[0026] Then 100ml of furfural-saturated oil solution was mixed with 100ml of pure transformer oil to form the first diluted furfural oil sample. Take 100ml of the first diluted furfural oil sample and mix it with 100ml of pure transformer oil to form the second diluted furfural oil sample.

[0027] Repeat the dilution ten times in sequence to prepare ten standard oil samples with concentration gradients, the furfural concentrations are 176mg / L, 88mg / L, 44mg / L, 22mg / L, 11mg / L, 5.5mg / L, 2.75mg / L , 1.38mg / L, 0.69mg / L, 0.34mg / L.

Embodiment 2

[0028] Embodiment 2: prepare the furfural water extract of standard oil sample

[0029] Get 70ml respectively from ten kinds of standard oil samples containing different concentrations of furfural prepared in Example 1, mix them with 7ml deionized water respectively in ten 100ml Erlenmeyer flasks according to the ratio of 10:1, and stir magnetically for 5min to make the extraction fully , and then poured them into 100ml centrifuge tubes respectively, centrifuged at 8500r / min for 5min, and took out the lower layer separation liquid as furfural water extract.

Embodiment 3

[0030] Embodiment 3: Determine the Raman characteristic peak of furfural

[0031] Choose a laser with a wavelength of 532nm, choose a slit width of 100μm, choose a 1200l / mm type grating, integrate time for 30s, and integrate twice.

[0032] Under the same experimental environment and conditions, for ten standard oil samples (furfural concentration is 176mg / L, 88mg / L, 44mg / L, 22mg / L, 11mg / L, 5.5mg / L, 2.75mg / L, 1.38 mg / L, 0.69mg / L, 0.34mg / L), pure furfural as a control and deionized water as a control were subjected to direct Raman detection, and their Raman spectra were obtained. Figure 4 The Raman spectra of the water extract of the standard oil sample with a furfural concentration of 176 mg / L, pure furfural as a control, and deionized water as a control are shown.

[0033] Make a preliminary judgment on the attribution of the Raman spectrum peaks. From the measured Raman spectrum, it can be seen that the Raman detection spectrum obtained by extraction with deionized wate...

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Abstract

The invention provides a method for detecting furfural content of transformer oil. The method is characterized by comprising steps as follows: step 1, furfural dissolved in the transformer oil is extracted; step 2, furfural extract is subjected to Raman spectrum detection; step 3, furfural is quantified according to a Ramancharacteristic peak value of furfural. In the step 1, furfural dissolved the transformer oil is extracted with deionized water; in step 2, a Raman peak at 1372 cm<-1> or 1411 cm<-1> is taken as a Ramancharacteristic peak of furfural, furfural concentration is taken as a horizontal coordinate x, the Ramancharacteristic peak value of furfural is taken as a vertical coordinate y, and the furfural content of the transformer oil is determined according to the furfural quantitative analysis model as follows: y=-303.35323+39.90799x. According to the method, the deionized water is used as an extraction agent, Raman intensity of trace furfural dissolved in the transformer oilis greatly enhanced, Raman detection sensitivity of the of trace furfural dissolved in the transformer oil is greatly improved, and online monitoring level for transformer insulating condition is improved.

Description

technical field [0001] The invention belongs to the technical field of on-line monitoring and fault diagnosis of electrical equipment insulation, and in particular relates to a method for detecting furfural content in transformer oil. Background technique [0002] Most electrical equipment uses an insulation system composed of oil insulation and paper insulation, and transformers are no exception. During long-term operation, the oil-paper insulation material will age, and the insulation level will decrease accordingly. One of the important indicators for testing transformers is to evaluate the aging degree of oil-paper insulation, and furfural is an important indicator for evaluating the aging degree of oil-paper insulation. [0003] At present, the methods for detecting furfural in oil include high performance liquid chromatography, spectrophotometry and electrochemical analysis. The detection procedures of these methods are very cumbersome and have high requirements for ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/65G01N1/40
CPCG01N21/65G01N1/4055G01N2001/4061
Inventor 陈伟根万福史海洋周炜然黄映洲谭亚雄王有元杜林李剑黄正勇王飞鹏周湶张束桦
Owner CHONGQING UNIV
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