Differential spectrum function peak valley point discriminating method for aging condition of oil paper insulation equipment

Abstract

The invention relates to a differential spectrum function peak valley point discriminating method for the aging condition of oil paper insulation equipment. According to the method, at first, a differential spectrum unfolding method is used for carrying out differential spectrum unfolding on depolarization current spectrum lines tested by the oil paper insulation equipment to obtain a primary differential spectrum function, and then the number of peak valley points of the primary differential spectrum function is observed; if the number of the peak valley points can not be identified in the primary differential spectrum function, secondary differential spectrum unfolding is carried out on the depolarization current spectrum lines for obtaining a secondary differential spectrum function, and the number of peak valley points of the secondary differential spectrum function is observed; finally, the aging condition of the oil paper insulation equipment is judged according to the number of the peak valley points of the primary or secondary differential spectrum function. According to the method, the differential spectrum unfolding method is used for highlighting the aging characteristic implied in the depolarization current spectrum lines of the oil paper insulation equipment in the peak valley point form, the peak valley point form is used for evaluating the aging condition of the oil paper insulation equipment, an intuitive, accurate and reliable analysis means is provided for judging the aging condition of the oil paper insulation equipment, and the blank in the field of oil paper insulating aging diagnosis research is filled.

Description

technical field [0001] The invention belongs to the technical field of aging evaluation of oil-paper insulation equipment, and in particular relates to a differential spectrum function peak-valley point discrimination method for the aging status of oil-paper insulation equipment. Background technique [0002] At present, the commonly used methods for aging assessment of oil-paper insulation equipment include non-electrical characteristic analysis method and electrical characteristic discrimination method. Non-electrical characteristic analysis methods include: analysis method of furfural content in oil, chromatographic analysis method of dissolved gas in oil, determination method of polymerization degree, etc. Although these methods have been applied in practice, but the method is not perfect and needs further research. The electrical characteristic discrimination methods mainly include experimental testing method, recovery voltage measurement method and polarization and de...

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Problems solved by technology

Although these methods have been applied, there are still some problems, such as 1) the dielectric polarization equivalent circuit adopts a linear model, which cannot truly reflect the polarization inside the oil-paper insulation; 2) the identification of equivalent circuit parameter values The accuracy is not high, the calculation is complicated, and there is still a certain error with the actual parameter value; 3) The existing insulation aging diagnosis method lacks comprehensive consideration of the influence of temperature, micro moisture, products in the insulation aging process, and external factor interference.

So far, these problems have not been effectively solved, resulting in the inability to be widely used in practice.

In particular, there have been no literatures and reports on the application of depolarization current differential decomposition spectroscopy and the number of peak and valley points to judge the aging status of oil-paper insulation equipment intuitively and accurately.

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