Method for evaluating insulation aging degree of oil immersible power transformer

A power transformer and insulation aging technology, applied in the field of transformer insulation paper aging determination, can solve the problems of inaccurate aging assessment and single characteristic quantity of insulation paper aging assessment, so as to solve the problems of inaccuracy and limitations, ensure accuracy and Authenticity and operability

Inactive Publication Date: 2018-12-18
STATE GRID HEBEI ELECTRIC POWER RES INST +2
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Problems solved by technology

[0004] Aiming at the problem that the existing insulation paper aging evaluation feature quantity is single and the aging evaluation is inaccurate, the present invention provides a method for evaluating the insulation aging degree of oil-immersed power transformers

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  • Method for evaluating insulation aging degree of oil immersible power transformer
  • Method for evaluating insulation aging degree of oil immersible power transformer
  • Method for evaluating insulation aging degree of oil immersible power transformer

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Embodiment 1

[0059] An embodiment of the present invention provides a method for evaluating the insulation aging degree of an oil-immersed power transformer. The insulating oil is No. 25 transformer oil, which includes the following steps:

[0060]S1. Take 2.5uL of methanol and dissolve it in 20mL of No. 25 transformer insulating oil, oscillate fully with a vortex oscillator, and obtain a methanol-insulating oil mixed solution with a concentration of 110ug / g after standing still, and prepare methanol by double dilution method No. 25 transformer oil samples with concentrations of 0ng / g, 14ng / g, 27ng / g, and 60ng / g were tested by headspace sampling-gas chromatography-mass spectrometry. The test results are as follows figure 1 As shown, it can be seen from the figure that in the solution with a concentration of 27ng / g, the peak height is just higher than the height of matrix interference, that is, the detection limit value of methanol in No. 25 transformer insulating oil is 27ng / g.

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Abstract

The invention relates to the technical field of aging determination of transformer insulation paper and specifically discloses a method for evaluating the insulation aging degree of an oil immersiblepower transformer. The evaluation method comprises at least the following steps: step S1: extracting a transformer oil sample to be tested, and determining the concentration of methanol decomposed byaging of the insulating paper in the transformer oil through a headspace sampling-gas chromatographic mass spectrometry joint method; step S2: contrasting the insulating paper aging judgement standardand preliminarily determining the aging degree of the insulating paper according to the concentration of methanol in the transformer oil measured in the step S1; step S3: if the step S2 preliminarilydetermines that the aging degree of the insulating paper is a later period, the content of furfural in the transformer oil is measured, and the later period of aging of the insulating paper is subjected to auxiliary judgement. The method for evaluating the insulation aging degree of an oil immersible power transformer in the invention introduces a plurality of parameters to jointly evaluate the aging, thereby ensuring the accuracy and authenticity of the results.

Description

technical field [0001] The invention relates to the technical field of transformer insulation paper aging judgment, in particular to a method for evaluating the insulation aging degree of an oil-immersed power transformer. Background technique [0002] Large-scale power transformers are the main equipment in the power system and the core equipment of the substation. They are responsible for the important task of power transmission in the system. Its operating status is directly related to the safe operation of the system. The key to running. [0003] The degree of polymerization is the index that can best characterize the aging degree of insulating paper. However, the detection of the degree of polymerization of insulating paper requires the collection of insulating paper samples inside the transformer. When sampling, a power outage is required, which is a destructive test. Therefore, the degree of polymerization test method is not a practical method. effective monitoring m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N30/02G01N30/16
CPCG01N30/02G01N30/16G01N2030/025
Inventor 张立军刘克成李振海马慧芳王艳孟立会
Owner STATE GRID HEBEI ELECTRIC POWER RES INST
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