Judging method of solid insulating and aging degrees of transformer

Abstract

The invention relates to a judging method of the solid insulating and aging degrees of a transformer, which sequentially comprises the following steps of: 1. preparing a gradient concentration standard solution of a furfural solution, carrying out liquid chromatographic detection, and making a standard curve I; 2. taking insulating paper samples in an actual electric network transformer, carrying out the liquid chromatographic detection, and obtaining the furfural concentration in each sample according to the standard curve I; 3. respectively measuring the water content H thereof by adopting the insulating paper samples in the step 2, computing the dry paper concentration C, additionally sampling, measuring the specific viscosity thereof, and computing the polymerization degree of the insulating paper samples according to a Martin empirical formula; 4. making a standard curve II by using the polymerization degree of insulating paper as an abscissa and using the logarithm of the furfural concentration as an ordinate; and 5. measuring the furfural concentration for an unknown sample, obtaining the polymerization degree of the insulating paper according to the standard curve II in the step 4, and judging the solid insulating and aging degrees of the transformer according to an IEC60450 standard. The method only needs to extract proper oil samples, has simple operation, does not need power failure, and is a quite practical method.

Description

technical field [0001] The invention belongs to the technical field of transformer solid insulation diagnosis and life evaluation, and in particular relates to a method for judging the aging degree of transformer solid insulation. Background technique [0002] Transformers are important equipment in the power system. Once an accident occurs, it may cause a large-scale blackout, long maintenance cycle, high maintenance cost and wide impact. After a certain number of years, the transformer will fail due to various reasons. The most typical failure is the aging of solid insulation. The quality of solid insulation gradually declines during operation, and the structure is gradually damaged, which eventually leads to insulation failure and power equipment cannot continue to operate. If the degree of insulation aging is not judged in advance, serious consequences will occur. In the past 10 years, insulation aging ranked second among the causes of power system failures. [0003] A...

AI Technical Summary

Problems solved by technology

DGA detection mainly detects hydrocarbon gases, CO and CO 2 , the method is relatively mature, and the nature of the fault can also be judged according to the results. It is a relatively good method, but this method cannot reflect the aging of the solid insulation in the transformer alone.

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