Method for evaluating aging state of oil-paper insulation system of oil-immersed transformer

Abstract

The invention relates to a method for evaluating the aging state of an oil-paper insulation system of an oil-immersed transformer, and belongs to the field of power equipment evaluation, and the method comprises the steps: S1, carrying out the frequency domain dielectric response test of oil-immersed insulation paper boards with different moisture contents and aging states; S2, extracting a dielectric modulus characteristic quantity representing the synergistic interaction influence of the moisture and the aging product; and S3, constructing an association relationship between the polymerization degree of the oil-immersed insulating paper board and the imaginary part integral value of the dielectric modulus under the influence of synergistic interaction of moisture and the aging product. According to the method, the aging state of the oil-paper insulation system of the oil-immersed power transformer can be evaluated by fusing the synergistic effect of the moisture and the aging product; the moisture content can be in the range of 0.5%-5%, which is more in line with the actual operation of the on-site oil-immersed transformer, and makes up the technical problem that a traditional method only considers the single factor (moisture or aging) to evaluate the aging state of the oil-paper insulation system inaccurately.

Description

technical field [0001] The invention belongs to the field of electric equipment evaluation, and relates to a method for evaluating the aging state of an oil-paper insulation system of an oil-immersed transformer. Background technique [0002] Power transformers are the core power equipment for power transmission and energy conversion in power systems. Oil-immersed power transformers are widely used in power grids with voltage levels of 110kV and above. In the actual operation process, the oil-paper insulation system (insulating oil, cellulose insulation material) inside the oil-immersed power transformer will gradually deteriorate due to the influence of electrical stress, thermal stress, mechanical stress and environmental factors, which will reduce the mechanical strength of the oil-paper insulation system. , and water, acidic products, etc. gradually increased. The aging of oil-paper insulation can easily cause the insulation performance of power transformers to decline...

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Problems solved by technology

In addition, the existing methods for evaluating the aging state of the transformer oil-paper insulation system are all obtained under the condition that the moisture content of the oil-paper insulation system remains basically constant (<1%), and the moisture content of the transformer oil-paper insulation system will increase with its operating years. Therefore, the existing method is not completely suitable for the evaluation of the aging state of the transformer oil-paper insulation system when the moisture content is higher than 1%, and the evaluation error is large

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