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Method for preparing a sample wafer for testing the insulating property of an epoxy glue impregnated paper sleeve capacitor core

A technology of bushing capacitance and insulation performance, which is applied in the direction of measuring electricity, measuring devices, and measuring electrical variables. It can solve the problems of increased bubble content in the sample, no vacuum environment, and inequalities between pressure and tension, and achieve good equivalence. Effect

Active Publication Date: 2021-07-16
EXAMING & EXPERIMENTAL CENT OF ULTRAHIGH VOLTAGE POWER TRANSMISSION COMPANY CHINA SOUTHEN POWER GRID
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Problems solved by technology

Therefore, the main problem of the high-temperature vacuum forming method is that there is no tension control during the forming process, and the stretched state of the wrinkles is quite different from the actual capacitor core. At the same time, the content ratio of epoxy glue to crepe paper is also quite different. The actual insulation is quite different
In addition, the main problem for high-temperature compression molding is that there is no vacuum environment during the molding process and the force is pressure
Molding without a vacuum environment will lead to a significant increase in the bubble content inside the sample, and the insulation will change. In addition, the external pressure and tensile force cannot be equivalent to the force mode.
To sum up, the current methods for preparing samples for testing the insulation performance of epoxy glue-impregnated paper bushing capacitor cores have certain limitations, and the prepared test samples cannot be equivalent to the insulation material of the original bushing capacitor core.

Method used

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  • Method for preparing a sample wafer for testing the insulating property of an epoxy glue impregnated paper sleeve capacitor core

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Embodiment

[0028] The technical solutions of the present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0029] This embodiment provides a method for preparing samples for insulation performance testing of epoxy glue-impregnated paper casing capacitor cores. The main steps include: ①crepe paper winding, ②epoxy impregnation, ③vacuum curing, ④axial slicing, ⑤ Surface treatment, ⑥ surface electrode spraying.

[0030] ①Crinkle paper winding, under the condition of fixed tension, take the cylindrical rod as the axis, wind the crepe paper clockwise or counterclockwise on the outside of the cylindrical rod at a constant speed, until the diameter meets the requirements, stop the winding of the crepe paper and fix it The outermost layer of crepe paper to prevent loosening. The pulling force is not less than 100N, and the paper wrinkle / epoxy glue content ratio can be controlled by the size of the pulling force; the diameter of the rod is ...

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Abstract

The invention discloses a method for preparing a sample wafer for testing the insulating property of an epoxy glue impregnated paper sleeve capacitor core, and the method mainly comprises the steps: crepe paper winding, epoxy impregnation, vacuum curing, axial slicing, surface treatment, surface electrode spraying and the like. Therefore, the test result is closer to the real insulation performance of the insulation material.

Description

technical field [0001] The invention relates to the field of electrical insulation testing, in particular to a method for preparing samples for insulation performance testing of epoxy glue-impregnated paper casing capacitor cores. Background technique [0002] High-voltage bushings are used in power transmission and transformation projects to pass current-carrying conductors through metal boxes or valve hall walls of equipment with different potentials, to introduce or lead out full voltage and full current, and to function as insulation and mechanical support. , pulling force, vibration, wind force, atmospheric pollution and other comprehensive effects, integrating electricity, heat, force, environment and other factors into one, the operating conditions are extremely harsh, and the operating reliability is directly related to the operation safety of the large power grid. It is one of the key equipment for the safe and stable operation of the power system. Epoxy resin impr...

Claims

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Application Information

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IPC IPC(8): G01R31/20
CPCG01R31/20
Inventor 张晋寅韦晓星邓军周海滨谢志成潘志城刘青松
Owner EXAMING & EXPERIMENTAL CENT OF ULTRAHIGH VOLTAGE POWER TRANSMISSION COMPANY CHINA SOUTHEN POWER GRID
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