Oil paper insulation aging state evaluation method and system based on activation energy iterative correction

Abstract

The invention discloses an oil paper insulation aging state evaluation method and system based on activation energy iterative correction. By utilizing an iterative algorithm, activation energy is continuously corrected in an oil paper insulation aging state evaluation iteration process, so that the activation energy error is reduced and the accuracy of a temperature normalization process is improved. The method comprises the steps of carrying out temperature normalization processing on a frequency domain dielectric spectral curve of tested oil paper insulation equipment by utilizing an Arrhenius equation; carrying out curve fitting on the frequency domain dielectric spectral curve subjected to the temperature normalization processing and an H-N model to obtain characteristic parameters tau, alpha and beta of the H-N model; and matching the characteristic parameters with a database of oil paper insulation H-N models with different aging states to determine an oil paper insulation agingstate. An evaluation result has relatively high accuracy and reliability.

Description

technical field [0001] The invention belongs to the field of electric equipment state evaluation, relates to the evaluation of the aging state of oil-paper insulation equipment, and in particular relates to a method and system for evaluating the aging state of oil-paper insulation based on iterative correction of activation energy. Background technique [0002] The safe operation of the power grid is the basis for ensuring stable and reliable power supply. Power grid collapse and large-scale power outages will not only cause huge economic losses and affect people's normal life, but also endanger public safety and cause serious social losses. According to the State Grid operation analysis report, from 2005 to 2010, the power outage accidents caused by the failure of power transmission and transformation equipment accounted for 37% to 48% of the total accidents in that year, ranking first in the cause of failures. Power equipment safety is the first defense system for power g...

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Problems solved by technology

In this method, after obtaining the frequency-domain dielectric spectrum, it is first necessary to perform temperature normalization processing on it, but oil-paper insulations with different aging states have different activation energies, and the activation energy of oil-paper insulations with unknown aging states cannot be determined. The uniform or estimated activation energy is used in the temperature normalization process of the domain dielectric spectrum. There is a deviation between the activation energy and the activation energy corresponding to the aging state of the oil-paper insulation obtained in the final evaluation, and the accuracy of the evaluation results of the aging state of the oil-paper insulation is affected.

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