Insulation paper water content evaluation method based on robust wavelength screening

Abstract

The invention discloses an insulation paper water content evaluation method based on robust wavelength screening. The method comprises the following steps: 1, constructing an evaluation model; 2, acquiring a near infrared spectrum of the tested insulation paper; 3, substituting the obtained near infrared spectrum of the tested insulation paper into the evaluation model to obtain the water content of the tested insulation paper; according to the method, the correction model of the water content of the insulation paper is established by using the near infrared spectrum analysis technology, the water content of the insulation paper can be rapidly predicted on site, sampling is not needed, damage to insulation is avoided, and meanwhile the method has high precision, robustness and prediction capacity; according to the method, the characteristic information of the spectrum can be fully analyzed, high-quality wavelength point data can be extracted, the data dimension can be reduced, the problems of over-fitting or insufficient fitting and the like can be avoided to a certain extent, and a new technical thought is provided for the field.

Description

technical field [0001] The invention relates to the technical field of electrical engineering detection, in particular to a method for evaluating moisture content of insulating paper based on robust wavelength screening. Background technique [0002] In the field of electrical engineering, the detection and maintenance of the insulation state of electrical equipment is very important. Many key equipment in power systems, such as transformers, reactors, bushings, etc., have oil-paper insulation in their insulation structures. Moisture in insulating paper will seriously reduce the insulation performance of power equipment. For example, in transformers, moisture and insulating paper decomposition products enter the insulating oil, and its dielectric constant is relatively large. The increase in moisture content also increases the conductivity of the oil-paper insulation, resulting in increased leakage circuits and increased heat generation, which further leads to vaporization ...

AI Technical Summary

Problems solved by technology

The Karl Fischer titration method is widely used in the industry, but it needs to take out the paper sample, which is cumbersome to operate, susceptible to human influence, and takes a long time

Others, including dew point method, extraction method, and oil-paper moisture balance curve method, have poor measurement accuracy

However, the frequency-domain dielectric spectrum method proposed in recent years is easily limited by the test environment because the measurement requires a power supply.

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