CN101762680A - Method for detecting oil service lift of large-scale transformer - Google Patents

Abstract

The invention relates to a large-scale transformer, in particular to a method for detecting the oil service life of the large-scale transformer, which comprises the following steps of: firstly, preparing oil samples for liquid chromatogram analysis; secondly, analyzing the content A, B, C, D and E of 2-rfural, 2-furfuralcohol, 2-acetyl furan, 5-methyl-2-furfural, 5-hydroxymethyl-2-furfural in the oil samples by using the liquid chromatogram; thirdly, calculating the mole number T of the tetrahydrofuran functional group of each component obtained from the step two by using the following formula: T=A/80 + B/82 + C/94 + D/94 + E/110; and fourthly, judging the aging degree of the transformer oil according to the mole number of the tetrahydrofuran functional group obtained from the step three. By utilizing the method of the invention, the aging degree of the transformer oil can be accurately judged, and the abnormal rejection of the transformer can be prevented.

Description

The detection method of oil service lift of large-scale transformer

Technical field

The present invention relates to high-power transformer, relate in particular to the monitoring method of high-power transformer.

Background technology

General relatively large transformer generally all with insulating oil, insulating paper and insulating board as its insulating material.Along with the operation of transformer is used, the insulating material in the transformer consumes gradually and degrades.The degraded of insulating material has reduced the safety coefficient of transformer, to such an extent as to finally cause transformer to be scrapped.Unplanned the scrapping of transformer will badly influence daily production, so how correct assessment transformer's life span is the work that also is very important an important while.

Still do not have reliable clear and definite means for effective assessment of transformer life in the current transformer diagnostic field, unique foundation that can be used to consider the TRANSFORMER INSULATING MATERIAL palliating degradation degree has only the data of furfural content in the insulating oil.Furfural is insulating paper, insulating board catabolite, long-term resident being dissolved in the insulating oil of meeting after it generates, and unsuitable decomposition and consumption, and the furfural data are the important indicators that characterize the TRANSFORMER INSULATING MATERIAL degraded in the insulating oil.

The difference of conditions such as the temperature when showing insulating material according to degraded according to data, time can generate 5 kinds of different organic products, and data shows that 5 kinds of components are respectively furfural (2 furan carboxyaldehyde), furfuryl alcohol (2-furancarbinol), 2-acetyl furan, 5-methyl-2-furfural, 5-methylol-2 furfural.Its structural formula is as follows:

2 furan carboxyaldehyde 2-furancarbinol 2-acetyl furan

5-methyl-2-furfural 5-methylol-2 furfural

Liquid chromatography is separated, the method for ultraviolet detection and detection means all adopts.We can carry out quantitative test by successful 5 kinds of organic constituentses in the insulating oil according to IEC1198-1993 " inorganic insulation oil is determined 2-furfural and related compound method ".

Domestic diagnosis data for the transformer oil life-span is only differentiated at this component of 2-furfural, and other 4 kinds of organic products is not described.But we find in detection, and 5 kinds of component concentration content distribution do not become rule, if according to one-component the decomposition situation of whole decomposition products and TRANSFORMER INSULATING MATERIAL is carried out analysis and judgement, obviously are unscientific.

Summary of the invention

The present invention is intended to solve the above-mentioned defective of prior art, and a kind of detection method of oil service lift of large-scale transformer is provided.Utilize method of the present invention can judge the degree of aging of transformer oil exactly, stop that transformer is improper to be scrapped.

The present invention is achieved in that

A kind of detection method of oil service lift of large-scale transformer, it comprises a following step:

Step 1, the oil product sample of preparative liquid chromatography analysis usefulness;

Step 2 is utilized content A, B, C, D, the E of 2 furan carboxyaldehyde in the middle of the liquid-phase chromatographic analysis oil product sample, 2-furancarbinol, 2-acetyl furan, 5-methyl-2-furfural, 5-methylol-2 furfural;

Step 3, utilize in the following formula calculation procedure two the molal quantity T of the tetrahydrofuran functional group of each component that obtains:

T＝A/80+B/82+C/94+D/94+E/110；

Step 4, the molal quantity of the tetrahydrofuran functional group that obtains according to step 3 is judged the degree of aging of transformer oil.

" the furfural content determination method in the transformer oil " that the furfural method of testing is drafted for portion of State Grid in present domestic transformer life diagnosis, because its duty of high-power transformer in the power industry is relatively stable, the proportional substantially increase of its 5 kinds of components has its certain reason and only analyze the diagnostic method that a kind of component corresponds to transformer state again in the standard of Electricity Department.But transformer to other large enterprises such as large-scale iron and steel enterprise or chemical industry, oil refining, working condition is also unstable, the put on airs furnace transformer of shaped steel iron enterprise, often be high capacity and low load alternation, such aging condition that duty produced is just greatly different with the transformer of power industry, so with the condition diagnosing of the corresponding transformer of a kind of component science not just.Therefore, the present invention is in the transformer life diagnosis, and it is necessary that 5 kinds of aging derivative products of insulating material are comprehensively analyzed, and also is correct.This way can be avoided the mistaken ideas in the present transformer diagnostic techniques, and real correct objectively diagnosis transformer life state stops that transformer is unplanned to be scrapped.

Embodiment

The detection method of the exhausted life of oil of a kind of high-power transformer, it comprises a following step:

Step 1, the oil product sample of preparative liquid chromatography analysis usefulness;

Step 2 is utilized content A, B, C, D, the E of 2 furan carboxyaldehyde in the middle of the liquid-phase chromatographic analysis oil product sample, 2-furancarbinol, 2-acetyl furan, 5-methyl-2-furfural, 5-methylol-2 furfural;

Step 3, utilize in the following formula calculation procedure two the molal quantity T of the tetrahydrofuran functional group of each component that obtains:

T＝A/80+B/82+C/94+D/94+E/110；

Step 4, the molal quantity of the tetrahydrofuran functional group that obtains according to step 3 is judged the degree of aging of transformer oil.

Claims (1)

1. the detection method of an oil service lift of large-scale transformer is characterized in that, it comprises a following step:

Step 1, the oil product sample of preparative liquid chromatography analysis usefulness;

Step 2 is utilized content A, B, C, D, the E of 2 furan carboxyaldehyde in the middle of the liquid-phase chromatographic analysis oil product sample, 2-furancarbinol, 2-acetyl furan, 5-methyl-2-furfural, 5-methylol-2 furfural;

Step 3, utilize in the following formula calculation procedure two the molal quantity T of the tetrahydrofuran functional group of each component that obtains:

T＝A/80+B/82+C/94+D/94+E/110；

Step 4, the molal quantity of the tetrahydrofuran functional group that obtains according to step 3 is judged the degree of aging of transformer oil.