Method and system for evaluating insulation aging state of high-voltage dry-type bushing based on frequency domain and time domain

Abstract

The invention belongs to the technical field of insulation dry-type bushing detection in power equipment, and discloses a method and a system for evaluating the insulation aging state of a high-voltage dry-type bushing based on a frequency domain and a time domain. The method for evaluating the insulation aging state of a high-voltage dry-type bushing based on a frequency domain and a time domain comprises the steps that after aging treatment is carried out on a dry-type bushing independent insulation material sample and a dry-type overall bushing model, PDC measurement is carried out on the dry-type bushing independent insulation material sample and the dry-type overall bushing model at different temperatures. FDS measurement is carried out on the dry-type bushing independent insulating material sample and the dry-type overall bushing model at different temperatures and humidity. According to the method for evaluating the insulation aging state of the high-voltage dry-type bushing based on the frequency domain and the time domain, the aging state of an insulating material of a dry-type bushing is effectively analyzed according to a PDC measurement result and an FDS measurement result of the single insulating material sample of the dry-type bushing and the dry-type integral bushing model, and loss caused by bushing accidents can be effectively avoided.

Description

technical field [0001] The invention belongs to the technical field of insulating dry-type bushing detection in electric equipment, and in particular relates to a method and system for evaluating the insulation aging state of high-voltage dry-type bushings based on frequency domain and time domain. Background technique [0002] At present, high-voltage bushings are most electrical equipment, including but not limited to transformers, circuit breakers, capacitors and other devices, which refer to devices that allow one or more conductors to pass through partitions such as walls or boxes for insulation and support. During long-term operation, certain defects may appear due to the heating effect of conductors in the electric field, mechanical damage and chemical corrosion, and atmospheric conditions. The main insulation of the dry bushing is composed of a coaxial cylindrical series capacitor bank formed by winding layered insulating materials and foil metal electrodes on the co...

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Problems solved by technology

[0006] Through the above analysis, the existing problems and defects of the prior art are: in the prior art, there are insufficient methods for effectively evaluating the aging state of the high-voltage dry-type bushing insulation. In the prior art, by measuring multiple non-destructive The characteristic parameters are used to predict the insulation aging state and remaining life of the dry bushing. When selecting the characteristic parameters, the correlation problem must be considered. This process is difficult to grasp. At the same time, how to obtain a large number of reliable non-destructive parameter tests for power equipment And the breakdown data voltage is also a big problem. It is difficult to carry out a large number of actual experiments in terms of economy and practical operation. The data obtained through laboratory simulation is only for reference and cannot be used as reference data in the actual operation of power equipment.

Therefore, without the support of a large number of non-destructive characteristic parameter data, and without a large number of breakdown voltage data, no effective conclusions can be made when judging the insulation aging state and life of the dry-type bushing, and it is impossible to correctly judge the dry-type bushing. If the judgment is wrong, it will not be able to effectively avoid the loss caused by the casing incident

[0007] The difficulty in solving the above problems and defects is: the problem in the prior art is that it is impossible to obtain non-destructive characteristic parameters and breakdown voltage data of dry bushings in a large number of actual experiments, and it is difficult to solve this problem from the aspects of economics and operational difficulty

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