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Raman spectrum detection method for measuring content of acetone dissolved in transformer oil

A technology of Raman spectrum detection and transformer oil, which is applied in the field of analysis and detection, can solve the problems of complex components of transformer oil and low acetone content, and achieve the effects of fast detection speed, high accuracy and high detection sensitivity

Inactive Publication Date: 2017-07-14
CHONGQING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the composition of transformer oil in operation is complex, and the content of dissolved acetone in transformer oil is low. The current Raman spectroscopy detection technology cannot meet the actual engineering needs of the detection of aging characteristics in transformer oil.

Method used

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  • Raman spectrum detection method for measuring content of acetone dissolved in transformer oil
  • Raman spectrum detection method for measuring content of acetone dissolved in transformer oil
  • Raman spectrum detection method for measuring content of acetone dissolved in transformer oil

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Embodiment 1 establishes the quantitative analysis model of dissolved acetone in transformer oil

[0021] 1. Select the extractant

[0022] According to the principle of similar miscibility, methanol, acetonitrile, three deionized water and dichloromethane were successively selected as the extraction agent of acetone in transformer oil. Comparing the extraction effects of the four extractants, it was found that the order of the Raman signal intensity of acetone in the extractants was methanol>acetonitrile>three times deionized water>methylene chloride. In addition, acetonitrile is moderately toxic and the most toxic; the density of tertiary deionized water is higher than that of transformer oil, and a separatory funnel is required for liquid separation, which increases the complexity of the extraction process; the extraction of acetone in transformer oil by dichloromethane The rate is very low, and some components of transformer oil will be extracted, which will reduce...

Embodiment 2

[0035] Example 2 Carry out Raman spectrum detection on the prepared transformer oil sample with known acetone concentration

[0036] In the laboratory, a standard transformer oil sample with an acetone content of 5.0mg / L was prepared for detection, and the operation was performed according to the following steps (the operation process is as follows: image 3 shown):

[0037] 1) Extract the transformer oil sample

[0038] Take 40mL of standard transformer oil sample and 4mL of methanol respectively into a 50mL brown Erlenmeyer flask with a stopper, and put a magnetic stirrer on the magnetic stirrer at constant temperature (30°C) to stir for 5 minutes and mix them thoroughly; then pour the mixture into 50mL Place in a centrifuge tube and centrifuge at 6000r / min for 5min in a high-speed centrifuge to separate the methanol extract from the oil sample, and take the supernatant extract for later use.

[0039] 2) Obtain the Raman spectrum of the extract

[0040] The extract in step ...

Embodiment 3

[0045] Example 3 Using the Raman Spectroscopy Detection Method to Detect the Acetone Content in the Transformer Oil Sample

[0046] The acetone content of oil-paper insulation aging failure oil samples from transformers operating on site was determined to be 6.8 mg / L by headspace gas chromatography. Utilize the method of the present invention to carry out Raman spectrum detection to this sample again, operate according to the following steps:

[0047] 1) Extract the transformer oil sample

[0048] Take 40mL of oil sample and 4mL of methanol respectively into a 50mL brown Erlenmeyer flask with a stopper, put in a magnetic stirrer and stir at a constant temperature (30°C) on a magnetic stirrer for 5min to fully mix; then pour the mixture into a 50mL centrifuge tube Place in a high-speed centrifuge at 6000r / min for 5min to separate the methanol extract from the oil sample, and take the supernatant extract for later use.

[0049] 2) Obtain the Raman spectrum of the extract

[0...

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Abstract

The invention discloses a Raman spectrum detection method for measuring the content of acetone dissolved in transformer oil. The method comprises the following steps: (1) extracting a transformer oil sample: using methanol to extract acetone; (2) obtaining the Raman spectrum of the extract: using a light source of incident laser with a wavelength of 532 nm to carry out Raman spectrum scanning on the extract; (3) preprocessing the Raman spectrum chart: subjecting the extract Raman spectrum chart to a pretreatment of impure peak elimination, baseline adjustment, and smooth de-noising, and carrying out a strength normalization treatment by taking the Raman spectrum peak of methanol in 1034 cm<-1> as the internal standard; and (4) performing quantitative detection: calculating the areas of the characteristic peak of acetone and internal standard peak of methanol, calculating the relative Raman strength of acetone, and according to an quantitative correction curve of acetone in transformer oil namely y=5.47*10,-4>x-6.69<10-4>, wherein x represents the relative Raman strength of acetone, and y represents the acetone concentration, calculating the content of acetone. The provided method has the advantages of high detection sensitivity, high accuracy, and wide detection limit.

Description

technical field [0001] The invention relates to the field of analysis and detection, in particular to a Raman spectrum detection method for dissolved acetone content in transformer oil. Background technique [0002] As the key equipment of the power system, large power transformers play a pivotal role in the process of power transmission and transformation. Its safe operation is particularly important to ensure the safety and stability of the power system. The oil-paper insulation system composed of mineral insulating oil and fiber insulating paper and cardboard is the main form of transformer internal insulation. During the aging process of running transformers, the insulating oil and insulating paper themselves will decompose and produce CO, CO 2 , furfural, acetone and other substances that reflect fault properties and insulation properties, and are soluble in oil. As the characteristic substances for judging transformer insulation aging indicators, CO, CO 2 and furfur...

Claims

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Application Information

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IPC IPC(8): G01N21/65G01N1/34
CPCG01N21/65G01N1/34
Inventor 陈伟根顾朝亮万福李剑王有元杜林周湶王飞鹏黄正勇
Owner CHONGQING UNIV
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