Subjective and objective integral evaluation method for running state of oil immersed type capacitive sleeve

Abstract

The invention belongs to the technical field of maintenance of the operation state of electric transmission and transformation equipment, and discloses a method for detecting the running state of an oil immersed type capacitive sleeve. The method includes the steps of carrying out relative degradation degree calculation on the operating parameters of the oil immersed type capacitive sleeve, obtaining the relative degradation degree of each operation parameter; wherein the operating parameters comprise the to-ground end screen dielectric loss, the electric capacity change rate of the oil-immersed capacitive sleeve, the sleeve end screen-to-ground insulation resistance, the content of H2 and C2H2 in the sleeve oil and the maintenance frequency; obtaining a first weight of each operation parameter by adopting an analytic hierarchy process; obtaining a second weight of each operation parameter by adopting an entropy weight method; integrating the first weight and the second weight througha cuckoo algorithm to obtain the final weight; integrating the relative degradation degree of each operation parameter according to the final weight, and obtaining the evaluation value of the runningstate of the oil immersed type capacitor sleeve. The evaluation value obtained by the method is closer to the actual operation state of the oil immersed type capacitive sleeve. The method has the advantages of being comprehensive in evaluation factor, clear in quantification and high in operability.

Description

technical field [0001] The invention belongs to the technical field of maintenance of the running state of power transmission and transformation equipment, and in particular relates to a method for detecting the running state of an oil-immersed capacitor bushing. Background technique [0002] Power transformers connect windings of different voltage levels to the line through bushings, and use bushings of different voltage levels to insulate the transformer oil tank. The bushing is the current-carrying element of the power transformer, which not only insulates the ground, but also acts as a fixed lead. For the power transformer in operation, the running current will flow through the lead wire in the bushing. Therefore, once a short circuit occurs, the current will increase sharply and impact the bushing. In severe cases, the bushing will burst and cause serious accidents. Power transformer bushing is one of the components with high failure probability in power transformer ac...

AI Technical Summary

Problems solved by technology

However, both the subjective and objective weighting methods have their limitations, and the subjective weighting method has its subjective arbitrariness; the objective weighting method often ignores the subjective information of the decision maker, especially in the case of casing operation status evaluation, which is more practical in engineering. field

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