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Method for determining content of methanol in insulation oil

A technology of methanol content and determination method, which is applied in the field of analysis and testing, can solve the problems of no testing standards, etc., and achieve the effect of ensuring the consistency of the injection volume, avoiding pollution, and avoiding material interference

Inactive Publication Date: 2017-12-26
CHONGQING UNIV
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Problems solved by technology

However, the measurement method of methanol content in insulating oil has not been mentioned, and there is no relevant test standard in China

Method used

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  • Method for determining content of methanol in insulation oil
  • Method for determining content of methanol in insulation oil
  • Method for determining content of methanol in insulation oil

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Experimental program
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Embodiment 1

[0043] refer to figure 1 Determination of Methanol Concentration in Insulating Oil

[0044] (1) Set the test parameters of the headspace sampler and the gas chromatography-tandem mass spectrometer respectively, specifically:

[0045] The test parameters for the headspace sampler are:

[0046] Headspace syringe volume: 2.5mL;

[0047] Headspace bottle volume: 20mL;

[0048] Heating temperature: 120°C;

[0049] Oscillation time: 20min;

[0050] The gas chromatography conditions are:

[0051] Carrier gas: high purity helium;

[0052] Carrier gas flow rate: 0.5mL / min;

[0053] Chromatographic column: strong polar chromatographic column;

[0054] Injection mode: split injection, split ratio 30:1;

[0055] Injection port temperature: 250°C;

[0056] The scan mode is full scan, and the temperature program setting is: furnace temperature 40°C, then rise to 110°C at 5°C / min, keep for 5min, then rise to 270°C at 20°C / min, keep for 13min;

[0057] The mass spectrometry conditi...

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Abstract

The invention relates to a method for determining a content of methanol in insulation oil, which belongs to the technical field of analysis and test. The method mainly utilizes a headspace sample injector to be combined with a gas chromatography tandem mass spectrometry, and adopts an automatic headspace sample injection, so that compared with a manual sample injection way, the method has the characteristics of high accuracy, and higher repeatability, ensures that the sample can be consistently treated before entering the gas chromatography, avoids the interference of other substances in the detection process, and improves the accuracy for determining the content of the methanol; and further, the gas chromatography is used as a mass spectrometry front-end separation system, a sample to be detected is separated by virtue of the gas chromatograph and is then directly led into the mass spectrometry to be detected, so that the complex process for preparing and transferring the sample can be avoided, and the sample can be prevented from being polluted; and moreover, the consistence of the sample feeding amount of the mass spectrometry can be ensured, the mass spectrometry is used as a detector to qualitatively or quantitatively detect the content of the methanol, and finally a detect object can be accurately qualified and quantified.

Description

technical field [0001] The invention belongs to the technical field of analysis and testing, in particular to a method for measuring methanol content in insulating oil Background technique [0002] Oil-paper insulation is the main form of insulation in transformers, while cellulose insulating paper is widely used in the manufacturing process of transformers. During the long-term operation, the insulating paper is gradually aged due to the influence of electricity, heat, moisture, machinery and other factors, and eventually the life of the transformer is terminated due to failure. Among them, cellulose is polymerized by glucose monomers, the number of repeating structural units or D-glucopyranose groups contained in a cellulose linear molecule is called the degree of polymerization (DP) of the molecule, and the degree of polymerization The decrease can directly reflect the decrease in mechanical strength of insulating paper after aging. As the insulating paper ages, corresp...

Claims

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Application Information

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IPC IPC(8): G01N30/02G01N30/06
Inventor 杨丽君孙伟栋周奎宇郝建成立廖瑞金赵学童
Owner CHONGQING UNIV
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