Moisture influence factor correction method and system for insulation paper spectrum

Abstract

The invention relates to a moisture influence factor correction method and system for an insulation paper spectrum, and the method comprises the steps: obtaining insulation paper spectrum data Xw before correction, carrying out the processing through a difference method, obtaining a difference matrix D of a dry insulation paper sample and an insulation paper sample in different water-containing states, carrying out the principal component decomposition of the difference matrix D, and obtaining a matrix G; obtaining a moisture influence matrix Q; processing the moisture influence matrix Q to obtain a conversion matrix P; and finally, obtaining corrected insulation paper spectrum data Xpre by using a correction method. According to the method, the influence of the water content state difference between different samples on the prediction precision is considered, the part influenced by the water content in the sample spectrum is corrected, and the original spectrum data is mapped to the space orthogonal to the spectrum influenced by the water content, so that the spectrum change caused by the fluctuation of the water content factor is removed, and the prediction precision of the polymerization degree of the insulation paper is effectively improved.

Description

technical field [0001] The invention relates to the technical field of fault diagnosis of power equipment, in particular to a method and system for correcting moisture influencing factors of insulating paper spectra. Background technique [0002] As the key equipment in the power grid, the large oil-immersed power transformer is in good condition to ensure the safe and reliable operation of the power grid. Oil-paper insulation is the main insulation structure inside a large oil-immersed power transformer. As the operating time increases, it will age under the action of various stresses such as electricity and heat. [0003] Oil-paper insulation is composed of insulating paper and insulating oil. The aging of insulating oil is reversible and can be reprocessed or replaced during the operation of the equipment; the aging of insulating paper is irreversible and difficult to replace. Therefore, the state of the insulating paper is directly related to the overall insulation stat...

AI Technical Summary

Problems solved by technology

However, there are still defects in this method: when performing spectral collection on insulating paper samples, the water content of the samples will increase significantly due to the long-term exposure of the samples to the air; and the moisture in the insulating paper samples will distort the spectra, resulting in the evaluation results The accuracy of the reduced, hindering the further application of the technology

[0005] At present, there is no effective moisture factor correction method in the field of spectral evaluation of insulating paper aging state

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