Preparation method of glue impregnated fiber capacitor type dry bushing capacitor plate material

Abstract

The invention discloses a preparation method of a glue impregnated fiber capacitor type dry bushing capacitor plate material, and belongs to the field of power transmission and transformation high-voltage bushings. In the preparation of the dry-type bushing capacitor plate material, an insulating material which is the same as a capacitor core insulating layer is used as a base material of the capacitor plate material, and the base material is synthetic fiber gridding cloth which is woven by a millimeter-level synthetic fiber material and has a certain mesh number; a transition metal layer I is electroplated on the surface of the base material, and a low-resistance metal layer II meeting the electrical requirement is electroplated on the surface of the treated electroplating transition metal layer I; the transition metal layer I and the monofilament fiber of the insulating material have similar surface potential energy to form a firm electroplated layer which is not easy to fall off; according to the invention, the defects in the prior art are overcome from the structure and the process, the production process period of the product is greatly reduced, the electrical performance of the product is improved, the bushing made of the electrode material with the structure can realize the zero partial discharge effect of the bushing, and the manufacturing qualification rate of the dry bushing can be greatly improved.

Description

technical field [0001] The invention belongs to the field of high-voltage bushings for power transmission and transformation, and in particular relates to a method for preparing a gel-impregnated fiber capacitive dry-type bushing capacitor plate material. Background technique [0002] At present, the dry-type high-voltage bushings used in the power transmission and transformation industry mainly include glue-impregnated corrugated paper type and glass fiber winding type. [0003] The current problems of glue-impregnated crepe paper: ①. The production process requires a large amount of crepe paper, all of which need to be made of wood, which does not conform to the current environmental protection trend and trend; ②. The vacuum drying and insulation treatment period of crepe paper fibers is extremely long and the production cost is high; ③. It is difficult for the epoxy resin in the capillary tube of crepe paper fiber to be completely saturated. In the later stage of producti...

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Problems solved by technology

[0003] The current problems of glue-impregnated crepe paper: ①. The production process requires a large amount of crepe paper, all of which need to be made of wood, which does not conform to the current environmental protection trend and trend; ②. The vacuum drying and insulation treatment period of crepe paper fibers is extremely long and the production cost is high; ③. It is difficult for the epoxy resin in the capillary tube of crepe paper fiber to be completely saturated. In the later stage of production, processing, transportation and operation, the exposed epoxy part must be sealed and protected by a special container, otherwise the paper fiber will be reabsorbed into the air. If there is too much water in the bushing, it will cause the dielectric loss of the bushing and the increase of partial discharge. Long-term operation will cause the bushing to fail and collapse, which will pose a major hidden danger to the equipment of the whole machine; It is difficult to control the tightness of the system, which has an important impact on the accuracy of the electrode layout and the degree of infiltration of the final epoxy resin, and requires high levels of process equipment and workers' operating proficiency; ⑤. There are many electrode layers, and the rolling In the process, any layer of electrode layout errors or other hidden defects will lead to the scrapping of the entire product, which is not convenient for mass industrial production

[0004] Glass fiber winding type: ①. The product is wound and manufactured in an open environment. The production process cannot be dried and insulated under vacuum conditions. The moisture contained in the insulating material itself and the moisture and impurities in the air cannot be removed, resulting in a relatively high dielectric loss of the product. Large, long-term operation will easily lead to thermal collapse of the product; ②, the edge treatment, flatness, concentricity and bonding performance of the aluminum foil metal capacitor electrode are poor, resulting in a large partial discharge of the product, often hundreds to thousands of picoku, Therefore, it cannot be used in conjunction with equipment that requires high electrical performance;

[0005] The traditional capacitor plate is made of aluminum foil, which has a dense structure and is an impermeable material, and it is often necessary to set multi-layer capacitor plates in a bushing according to the voltage level, which will cause the capacitor core to be vacuum impregnated In the process of epoxy resin, the flow direction of epoxy resin and the curing internal stress during the curing process are blocked and shielded by the metal plate, which is easy to form air gaps, or the curing internal stress cannot be released, resulting in delamination and formation of defects. It often leads to partial discharge failure of the product, or breakdown due to insufficient withstand voltage

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