Coating type composite material for dry type transformer and preparation method thereof

Abstract

The invention discloses a coating type composite material for a dry type transformer, which is characterized in that two layers of high temperature resistant epoxy resin are respectively coated on two surfaces of a five-layer composite material formed by compounding a thin film layer, adhesive layers and organic or inorganic fiber paper layers; the two surfaces of the thin film layer are adhered with the organic / inorganic fiber paper layers through the adhesive layers; and the organic / inorganic fiber paper layers can be soaked with the high temperature resistant epoxy resin. The invention further provides a preparation method of the coating type composite material for the dry type transformer. The preparation method comprises the following steps: compounding the thin film layer with the organic / inorganic fiber paper layers to form the five-layer composite material after soaking the thin film layer with adhesive, uniformly coating high temperature resistant epoxy resin coating liquid on the two surfaces of the prepared composite material, and cooling to the room temperature to obtain the product after heating and solidifying. The material is long in storage period at the room temperature, is ageing resistant, has an excellent electrical performance and is suitable for insulating between low-voltage coil copper (aluminum) foil taped coverings of the dry type transformer.

Description

technical field [0001] The invention belongs to the technical field of insulating materials, and in particular relates to a coated composite material for a dry-type transformer and a preparation method thereof. Background technique [0002] With the continuous improvement of grid power supply requirements and the advancement of transformer technology, dry-type transformers have developed rapidly in my country and have been widely used in almost all electrical equipment such as power stations, factories, and hospitals. At present, China's annual output of resin-insulated dry-type transformers alone has reached 10,000MVA, making it one of the countries with the largest production and sales of dry-type transformers in the world. [0003] The continuous development of dry-type transformers has put forward higher requirements for insulating materials that directly affect their life, especially composite materials used as main insulation. The performance of traditional DMD, NMN, ...

AI Technical Summary

Problems solved by technology

The performance of traditional DMD, NMN, NHN and other composite materials can no longer fully meet the needs of the development of dry-type transformers, and there are the following defects in their structural design:

[0004] 1. The adsorption performance of the material itself is limited. When used as interlayer insulation of dry-type transformers, it is difficult to bond closely with copper (aluminum) foil, and there will inevitably be gaps or air bubbles, making it difficult to ensure insulation performance;

[0005] 2. The surface of the material lacks protection and is directly exposed to high temperature, partial discharge, corona arc and other operating conditions. Affected by electrothermal aging, the overall performance continues to decline, which ultimately affects the service life of the transformer;

[0006] 3. The heat resistance limit of the composite material itself

[0007] Therefore, traditional composite materials have been difficult to meet the needs of the development of dry-type transformers. How to improve them and propose a new material structure design is a difficult problem to be solved by those skilled in the art.

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