Judging method of solid insulating and aging degrees of transformer

A technology of solid insulation and aging degree, used in instruments, scientific instruments, measurement of electrical variables, etc., can solve the problem of not being able to reflect the aging of solid insulation in transformers alone, and achieve the effect of convenient operation.

Inactive Publication Date: 2010-11-17
JIYUAN POWER SUPPLY COMPANY OF STATE GRID HENAN ELECTRIC POWER
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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 ac

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  • Judging method of solid insulating and aging degrees of transformer
  • Judging method of solid insulating and aging degrees of transformer
  • Judging method of solid insulating and aging degrees of transformer

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Embodiment Construction

[0050] The present invention will be described in detail below through examples, but the present invention is not limited in any way.

[0051] 1. Determination of analytical methods

[0052] (1) Selection of furfural analysis method

[0053] (1) Properties of furfural:

[0054] Furfural is a colorless oily liquid with a boiling point of 159.5-162.5°C and is easily soluble in alcohol or ether. Transformer oil is mainly composed of non-polar or weakly polar compounds such as alkanes and a small amount of aromatic hydrocarbons, so furfural in transformer oil can be extracted with highly polar methanol. A non-polar reverse phase C18 liquid chromatographic column is used as the stationary phase, and a mixed solution of methanol and distilled water is used as the mobile phase. When various components in the oil flow through the chromatographic column, due to the different diffusion speeds of the fixed relative substances in the chromatographic column, Thereby, various substances ...

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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...

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Application Information

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IPC IPC(8): G01R31/00G01N30/02G01N11/00G01N5/04
Inventor 李保东李晋城张健壮韩金华赵锋李胜利李昕岳彦峰姚勇王爱琴赵素平霍明霞
Owner JIYUAN POWER SUPPLY COMPANY OF STATE GRID HENAN ELECTRIC POWER
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