Preparation method of standard oil sample for furfural content determination of transformer oil

Abstract

The invention provides a preparation method of a standard oil sample for furfural content determination of transformer oil. The method includes: conducting pretreatment on transformer oil; dissolving furfural in n-butanol to prepare a furfural n-butanol diluent of certain proportion, and diluting the furfural n-butanol diluents with the pretreated transformer oil to generate a furfural transformer oil standard solution; utilizing methanol to perform oscillation extraction on the furfural transformer oil standard solution, and then filtering the extracted liquid, thus obtaining the standard oil sample for furfural content determination of transformer oil. The method provided by the invention can dissolve furfural completely in transformer oil, reduce the configuration error of the standard oil sample, and enhance the test result accuracy.

Description

technical field [0001] The invention relates to the technical field of power transformers, in particular to a method for preparing a standard oil sample for measuring furfural content in transformer oil. Background technique [0002] When judging whether there is an insulation fault or necessary for power transformer equipment, it is necessary to carry out the detection of furfural content in transformer oil. Due to the low concentration of the detection value of furfural to be tested, the lack of standard substances in the detection process, and the complex composition of transformer oil and high-efficiency liquid phase Due to the high precision of the chromatograph, it is very difficult to detect the furfural content in transformer oil, especially the low concentration content, which brings hidden dangers to the safe and stable operation of power equipment. [0003] With the continuous exploration of electric power technicians, among the relevant industry standards that ca...

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Problems solved by technology

[0004] (1) In the "Guidelines for Judgment of Insulation Aging of Oil-immersed Transformers", it is required to "use toluene as a diluent and co-solvent to prepare a standard solution of furfural transformer oil (standard oil sample) to obtain a standard oil sample of the required concentration", However, as a dangerous chemical, toluene is easy to cause cancer, easy to produce poison and difficult to buy, so it is not very practical;

[0005] (2) In "Determination of Furfural Content in Transformer Oil by Liquid Chromatography", whether it is method A or method B, there are also doubts about the preparation of standard oil samples; no standard oil samples are prepared in method A, and furfural methanol solution is directly used As a standard solution, the external standard method is used for detection, but due to the low content of furfural in the operating transformer oil and the unsatisfactory dissolution of furfural in the transformer oil, the lack of standard oil samples leads to certain deviations in the test results, and it is difficult to prove the validity of the test results. The authenticity of the transformer insulation cannot be accurately judged; the configuration of the furfural transformer oil standard solution proposed in method B, there is a situation of "high standard with low standard", and the furfural transformer oil with a concentration of 1000mg / L is gradually diluted to obtain The standard oil sample of 0.10 to 0.50mg / L increases the configuration error of the standard oil sample and reduces the accuracy, especially in the configuration of the low-concentration standard oil sample. The deviation is greater; at the same time, the method B directly transfers furfural into the blank transformer Dissolved in the oil, did not consider its dissolution in the oil, resulting in uneven concentration of the standard oil sample

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