Content measurement method for trace amount of aldehydes or ketone substance in transformer insulation oil

A technology for transformer insulating oil and substance content, applied in instruments, measuring devices, scientific instruments, etc., can solve problems such as chemical instability, insulating paper absorption, etc., and achieve the effect of good stability and optimized test conditions

Active Publication Date: 2019-08-02
CHINA ELECTRIC POWER RES INST +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the detection of furan compounds, that is, furfural, also has many defects, such as being absorbed by insulating paper, chemical instability, etc.

Method used

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  • Content measurement method for trace amount of aldehydes or ketone substance in transformer insulation oil
  • Content measurement method for trace amount of aldehydes or ketone substance in transformer insulation oil
  • Content measurement method for trace amount of aldehydes or ketone substance in transformer insulation oil

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Embodiment 1

[0071] (1) Sample processing

[0072] Take 5mL of the oil to be tested and put it into the headspace bottle, and record it as the background sample;

[0073] Put 5mL of other similar oil products to be tested into the headspace bottle, and record it as the sample to be tested.

[0074] (2) Sample preparation

[0075] 1) Prepare a methanol solution containing formaldehyde, acetaldehyde and acetone as a standard addition solution (1000 μg / mL dissolved in methanol);

[0076] 2) Take 15 mL of the background sample oil to be tested, add the standard addition solution prepared in step 1), and accurately record its mass, and prepare it as No. 1 mother solution.

[0077] 2) Take another 15mL background sample of the oil to be tested, and dilute No. 1 mother solution as No. 2 mother solution.

[0078] 3) According to the order of increasing concentration, prepare five 5mL samples by diluting the No. 2 mother liquor, record them as standard samples No. 1, 2, 3, 4, and 5 in sequence, ...

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Abstract

The invention provides a content measurement method for a trace amount of aldehydes or ketone substance in transformer insulation oil. The content measurement method comprises the steps of preparing amethanol solution containing a to-be-measured aldehydes and/or ketone substance as a standard addition liquid; adding the standard addition liquid into to-be-measured transformer insulation oil, andpreparing a series of samples; performing separation detection by a headspace sampling method and by a gas chromatography-FID or gas chromatography-mass spectrum combination method, and acquiring chromatogram peak area of a corresponding to-be-measured substance in the samples; and building a standard curve according to the chromatogram peak area and the addition concentration of the samples, performing fitting to obtain a linear equation, and calculating the content of the to-be-measured substance in the to-be-measured insulation oil according to the linear equation. By the measurement method, test of various types of aldehydes or ketone substances can be achieved by sampling in one time, quantitative and qualitative measurement of the aldehydes or ketone substances in the insulation oilis achieved, the content measurement method is good in repeatability and stability, and new judgment standard and idea is provided for improvement of aging estimation of a cellulose insulation material in a transformer.

Description

technical field [0001] The invention relates to the technical field of high-voltage insulation, in particular to a method for determining the content of trace aldehydes and ketones in transformer insulating oil. Background technique [0002] Aging assessment of cellulosic insulation in transformers is usually carried out by indirect measurement of chemical markers in the insulating oil. [0003] Furan compounds were first identified as indicators of paper aging in the early 1980s. Among them, 2-furyl aldehyde (2-FAL) is widely used because of its higher concentration in oil and better stability. However, the detection of furan compounds, that is, furfural, also has many defects, such as absorption by insulating paper, chemical instability and so on. [0004] In order to solve the shortcomings of the existing detection system, the present invention intends to improve the existing measurement system, and proposes to use formaldehyde, acetaldehyde and other aldehydes and acet...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N30/88G01N30/06
CPCG01N30/88G01N30/06
Inventor 王健一陆家榆周远翔张书琦程涣超李金忠张灵张云霄白松王帅陈雷王兆伟汪可刘雪丽遇心如
Owner CHINA ELECTRIC POWER RES INST
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