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Dielectric relaxation analysis method of epoxy material

A technology of epoxy material and dielectric relaxation, applied in the direction of material capacitance, etc., can solve the problem of lack of test accuracy

Pending Publication Date: 2022-08-09
XI AN JIAOTONG UNIV +2
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Existing technology relies on dielectric spectrum testing technology, affected by ambient temperature and humidity, for too low frequency (10 -2 Hz) and ultra-high frequency (10 7 Hz) above the polarization process does not have good test accuracy

Method used

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  • Dielectric relaxation analysis method of epoxy material
  • Dielectric relaxation analysis method of epoxy material
  • Dielectric relaxation analysis method of epoxy material

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Embodiment Construction

[0039]In order to make those skilled in the art better understand the solutions of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only Embodiments are part of the present invention, but not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0040] It should be noted that the terms "first", "second" and the like in the description and claims of the present invention and the above drawings are used to distinguish similar objects, and are not necessarily used to describe a specific sequence or sequence. It is to be understood that the data so used may be interchanged under appropriate c...

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Abstract

The invention discloses a dielectric relaxation analysis method of an epoxy material, which comprises the following steps of: performing fitting calculation on high-temperature dielectric spectrum experimental data on the basis of a DSC (Differential Scanning Calorimetry) experiment, fitting a complex dielectric constant by using a relaxation process delta, a relaxation process alpha and conductivity loss, and obtaining a parameter delta epsilon alpha for representing dipole polarization relaxation intensity; fitting a physical quantity A related to the dipole vector of the polar material; the frequency of a dielectric loss peak of a dielectric medium is related to the temperature, and physical and chemical parameters such as Tg and molecular activation energy which are used for representing the relaxation characteristic of a molecular chain can be obtained through fitting calculation of the relation between the frequency of the loss peak and the temperature by using an Arrhenius formula or a Vogel-Fulcher-Tammann (VFT) formula.

Description

technical field [0001] The invention belongs to the field of electrical insulation, and in particular relates to an experimental analysis method for the relaxation behavior of bisphenol A epoxy cured product molecular chains based on high temperature dielectric spectrum fitting calculation. Background technique [0002] Epoxy insulating material has good electrical properties, mechanical properties and excellent chemical corrosion resistance. As an insulating part and supporting part of power equipment, it is widely used in GIS (gas-insulated switchgear), dry-type transformers, reactors, etc. Widely used in power equipment. With the development of economy and society, the voltage level of power equipment is increasing day by day, which puts forward higher requirements for the comprehensive performance of basic insulating materials such as epoxy resin. The dielectric properties of epoxy dielectrics are the key to the long-term safe and stable operation of equipment. Changes ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/22
CPCG01N27/221
Inventor 王威望蒋起航陈新李明儒张翀杨威陈赟王琨邓先钦高凯
Owner XI AN JIAOTONG UNIV
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