Epoxy glue impregnated paper casing capacitor core insulation performance test sample preparation method

Abstract

The invention discloses a method for preparing samples for insulation performance testing of epoxy glue-impregnated paper casing capacitor cores. The main steps include: winding of crepe paper, epoxy impregnation, vacuum curing, axial slicing, surface treatment, surface electrode spraying, etc. Step, the sample prepared by this method is equivalent to the insulation material of the real bushing capacitor core, so 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...

AI Technical Summary

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.

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