Detection method for content of furfural in transformer insulation paper

Abstract

The invention discloses a detection method for the content of furfural in transformer insulation paper. The detection method mainly comprises the following operation steps that the insulation paper is sampled; the furfural in the insulation paper is extracted through methyl alcohol; the content of the furfural in the methyl alcohol is detected through a high performance liquid chromatography method; the content of the furfural in the insulation paper is calculated. The detection method for the content of the furfural in the transformer insulation paper is presented for the first time, and by simultaneously using the detection method and an existing detection method for the furfural in oil, the total furfural content in a transformer oil-paper insulation system can be obtained, and more comprehensive evaluation indexes can be supplied to transformer insulation remaining life prediction. Meanwhile, the detection method for the content of the furfural in the insulation paper has the advantages of being easy to operate and lower in cost and has the popularizing potential. In addition, the invention further provides a method for verifying the accuracy of detection on the content of the furfural in the insulation paper.

Description

Technical field [0001] The invention belongs to the field of aging assessment of transformer insulation paper, and relates to a method for detecting furfural content in transformer insulation paper. Background technique [0002] The transformer is the most critical and expensive core component of the power system. The reliable operation of the power grid requires the transformer to operate safely for a long time. The state of a transformer mainly depends on the state of its insulation system. The insulation system of a transformer is mainly composed of insulating oil and insulating paper. Since the insulating paper is difficult to replace, and its service life directly determines the service life of the transformer, the fault diagnosis and service life assessment of the transformer are mainly realized by judging the aging state of the insulating paper. [0003] The existing method for evaluating the degree of polymerization of insulating paper based on the furfural content in insu...

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Problems solved by technology

[0003] The existing method of evaluating the degree of polymerization of insulating paper by the furfural content in insulating oil is the most common method for evaluating the aging of insulating paper. However, this method has the following disadvantages: 1) furfural is a furan compound produced by the cracking and degradation of insulating paper. The furfural dissolved in the oil is only a small part of the total furfural produced by the degradation of insulating paper, so the furfural content in the oil cannot fully reflect the total furfural content produced by the degradation of the insulating paper; 2) furfural partition coefficient, that is, the furfural dissolved in the insulating oil The proportion of furfural adsorbed in insulating paper, the distribution coefficient is not constant, it will change with the change of external conditions such as temperature and humidity, resulting in changes in the content of furfural dissolved in insulating oil, affecting the aging of insulating paper Accuracy of assessment

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