A method for evaluating the insulation aging degree of oil-immersed power transformers

Abstract

The invention provides a method for evaluating the insulation aging degree of an oil-immersed type power transformer. By comprehensive consideration for multiple aging parameters such as the operating temperature, the content of gas in oil, the content of furfural and the concentration of corrosive sulfide of the transformer, the accuracy of a discrimination result is guaranteed. The method mainly comprises the following steps: detecting the content of gas dissolved in the oil and calculating the polymerization degree; measuring the content of the furfural in the oil and calculating the polymerization degree; determining the operating temperature and calculating the polymerization degree; measuring the initial content of dodecanethiol and DBDS in the oil and calculating the influence and the action on the decreasing rate of the polymerization degree of insulation paper; weighting and calculating the polymerization degree calculated according to all aging characteristic quantities, thus obtaining the polymerization degree of the insulation paper, and evaluating the insulation-aging condition. The method provided by the invention has the advantages that the basic principle is simple, the operability is strong, and the problems of inaccuracy and limitation of aging evaluation by single characteristic parameter are effectively solved; multiple parameters are introduced for combined evaluation of the aging, so that the accuracy and the truth of the result are guaranteed, and the method has important practical application significance for evaluating the insulation aging and the service life of oiled paper.

Description

technical field [0001] The invention relates to a method for evaluating and predicting the life of transformer oil-paper insulation, in particular to a method for evaluating the insulation aging degree of an oil-immersed power transformer. Background technique [0002] The safety of power equipment is the top priority for the smooth operation of power transmission and distribution networks, and the safety of equipment mainly lies in insulation safety. In order to avoid huge economic losses caused by blind replacement and potential safety hazards caused by continued operation without basis, it is necessary to use modern technology and analysis methods to evaluate the aging degree and remaining life of the insulation of power equipment in service in real time, so as to realize the guarantee of power equipment. Maximize its service life under the premise of safe operation and reliability. [0003] Oil-paper insulation is currently one of the main forms of insulation used in po...

AI Technical Summary

Problems solved by technology

The degree of polymerization is currently the most direct and reliable feature quantity for judging the life of insulating paper, but the degree of polymerization of insulating paper can only be measured offline, which is difficult to apply in engineering practice; CO / CO 2 It is greatly affected by the environment, and the insulating paper has an adsorption effect on it, which will affect the judgment result of the aging degree; furfural in the oil is easy to react with the antioxidant in the oil and will decompose at high temperature, and it is not reliable to evaluate the insulation aging by furfural content alone

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