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Bushing insulation oil paper temperature correction and activation energy prediction method based on dielectric modulus

A technology of dielectric modulus and prediction method, which is applied in the field of fault diagnosis of electrical equipment, can solve problems such as differences in main curves, and achieve reliable operation

Active Publication Date: 2021-06-01
GUANGXI UNIV
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Problems solved by technology

However, due to the different methods of constructing the main curve, the obtained main curve and α T There is also a difference

Method used

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  • Bushing insulation oil paper temperature correction and activation energy prediction method based on dielectric modulus
  • Bushing insulation oil paper temperature correction and activation energy prediction method based on dielectric modulus
  • Bushing insulation oil paper temperature correction and activation energy prediction method based on dielectric modulus

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Embodiment Construction

[0044] The preferred embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings, so that the advantages and features of the present invention can be more easily understood by those skilled in the art, so as to define the protection scope of the present invention more clearly.

[0045] Such as Figure 1aAs shown, this embodiment builds a method for temperature correction and activation energy prediction of casing insulating oil paper based on dielectric modulus, including the following steps:

[0046] Step S1, preparing bushing insulating oil paper with different moisture contents, and performing frequency-domain dielectric spectrum tests on the bushing insulating oil paper at different temperatures to obtain FDS curves corresponding to the complex permittivity;

[0047] This example requires the preparation of cellulose paperboard samples with different moisture contents. By placing the cardboard sample on a precision e...

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Abstract

The invention relates to the technical field of electrical equipment fault diagnosis, and discloses a bushing insulation oil paper temperature correction and activation energy prediction method based on dielectric modulus, comprising the following steps: obtaining an expression of a dielectric model M (omega); preparing experimental samples with different moisture contents, and performing frequency domain dielectric spectrum testing on the samples at different temperatures to obtain an FDS curve corresponding to a complex dielectric constant; converting the FDS curve corresponding to the complex dielectric constant imaginary part to obtain an FDS curve corresponding to M ''(omega); positioning the peak frequency fp of the FDS curve corresponding to the M "(omega) by using a least square method, and obtaining the change rule of the fp along with the temperature and the moisture; defining a translation factor, and obtaining a rule that the translation factor changes along with temperature and moisture; introducing a classical Arrhenius equation into activation energy calculation, and obtaining an activation energy calculation formula related to the translation factor; and establishing an activation energy prediction model. According to the invention, the influence of temperature and moisture in the oil-paper insulation system on activation energy is considered, and the method is of great significance to aging evaluation of on-site bushings.

Description

technical field [0001] The invention relates to the technical field of electrical equipment fault diagnosis, and more specifically, to a method for temperature correction and activation energy prediction of bushing insulating oil paper based on dielectric modulus. Background technique [0002] With the development of the times and the improvement of productivity, the role of power system in modern society is becoming more and more significant. As the core equipment of power transmission and transformation in the power system, the power bushing, as an indispensable part of the power system, plays a role in converting and transitioning electric energy. It has the advantages of high strength, good device stability and long service life. However, in recent years, relevant investigations have found that a large number of domestic power bushings are facing the problem that the service time is close to or even exceeding their design service life, and there is a high risk of insulat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F30/20G06F119/04
CPCG06F30/20G06F2119/04
Inventor 刘捷丰张镱议
Owner GUANGXI UNIV
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