Oiled paper insulation aging diagnosis method based on fluorescence color

Abstract

The invention relates to a fluorescent color-based oil paper insulation aging diagnosis method. The method comprises the following steps of S1, simulating a thermal aging process of oil paper insulation in a transformer, carrying out an oil paper insulation accelerated thermal aging test by adopting insulating oil and aromatic amide insulating paper to simulate the thermal aging process of the oil paper insulation in the transformer, different aging times being selected for sampling testing; S2, extracting aged amide fibers in the insulating oil; S3, testing fluorescence color characteristics of the aged amide fibers in the insulating oil, testing optimal excitation and emission intensity characteristics of the aged amide fibers in the insulating oil at different aging times, and obtaining CIE coordinates of fiber samples at different aging times; and judging the aging degree of oil paper insulation by taking fluorescence colors of the fiber samples at different aging times as characteristic quantities. The method is advantaged in that correlation between the fluorescence characteristic and the aging degree is directly and observably reflected through color conversion, the method is clearer, simpler and more convenient, and the overall service life of the transformer is judged more accurately.

Description

technical field [0001] The invention belongs to the technical field of liquid insulation, in particular to a method for diagnosing aging of oil-paper insulation based on fluorescent colors. Background technique [0002] The life of paper insulation determines the overall life of the transformer, and the aging assessment of paper insulation is of great significance to the operation and maintenance, maintenance and decommissioning of transformers. The power transformer is the core equipment of the power system. It is connected with the power generation, transmission and distribution links in the power system. Its safe and stable operation determines the safety and reliability of the power grid. is of great significance. At present, many transformers in my country have been operating for more than 20 years, and some have even exceeded 30 years. The paper insulation of these transformers is aging, the mechanical and insulation performance is degraded, and the probability of tra...

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Problems solved by technology

[0006] (1) On-site application is limited. For example, if tensile strength and paper polymerization degree are used as characteristic quantities, it is necessary to cut off the power of the transformer and take samples from the hanging cover, which is difficult to implement on site;

[0007] (2) The characteristic quantity is affected by many factors, and the accuracy needs to be improved, such as the CO and CO2 gas content in the oil, and at the same time, it comes from the oxidative degradation of insulating oil and air pollution;

[0008] (3) Operations such as oil change are likely to cause the loss of characteristic quantities, thereby causing aging assessment errors. For example, the furfural content in oil is low in the early stage, and the early aging state cannot be distinguished, and furfural is easily lost in oil change operations, and methanol in oil has high Volatile and easily lost by operations such as oil changes;

[0009] (4) The research on electrical characteristic quantities mainly stays at the qualitative stage, and the research is not yet mature. For example, the partial discharge-related characteristic quantities lack mechanism explanations and are difficult to quantify; the dielectric response-related characteristic quantities are difficult to accurately separate the influence of moisture and aging. In the qualitative analysis stage, it is still difficult to quantify

[0012] (1) Regarding the research object of fluorescence characteristics, existing inventions focus on insulating oil, but insulating oil is not the most important determinant of the aging life of oil-paper insulation, because it is easy to replace after aging, while paper insulation is difficult to replace after aging

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