Diamond dotted glue composite dielectric paper and preparation method thereof

Abstract

The invention discloses rhombus dispensing composite insulating paper, which is characterized in that the insulating paper consists of a polyester film layer, polyester fiber non-woven fabric layers for electrician insulation adhered to the upper surface and the lower surface of the polyester film layer by an F grade polyurethane adhesive, and a modified epoxy resin coated on the surfaces of the polyester fiber non-woven fabric layers for the electrician insulation in a rhombus shape. A method for preparing the rhombus dispensing composite insulating paper comprises the steps of preparing three layers of composite materials and preparing the rhombus dispensing composite insulating paper and so on. The adoption of the method has good product performance and a simple production technology, can save the manufacturing cost for an oil-immersed power transformer, and improve the quality; and a product of the invention is particularly suitable for insulating materials which are used for inter-layer insulation and inter-turn insulation of a foil winding coil of the oil-immersed power transformer and the inter-turn insulation of a mutual inductor.

Description

technical field [0001] The invention belongs to general parts of transformers or transformers and a preparation method thereof, and relates to a rhombic dispensing composite insulating paper and a preparation method thereof. The prepared insulating paper is especially suitable for use in foil winding coils of oil-immersed power transformers It is used as interlayer insulation, turn-to-turn insulation and transformer as an insulating material for turn-to-turn insulation. technical background [0002] In the prior art, the insulating material used as interlayer insulation and turn-to-turn insulation in foil winding coils of oil-immersed power transformers generally adopts single-layer cable insulating paper, which is sulfate insulating wood pulp (neutral with very little chemical impurities). Sulfite wood pulp or refined sulfate chemical wood pulp) is a polymer insulating paper made by chemical modification. The mechanical strength of this single-layer cable insulating paper (...

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Problems solved by technology

[0002] In the prior art, the insulating material used as interlayer insulation and turn-to-turn insulation in foil winding coils of oil-immersed power transformers generally adopts single-layer cable insulating paper, which is sulfate insulating wood pulp (neutral with very little chemical impurities). Sulfite wood pulp or refined sulfate chemical wood pulp) is a polymer insulating paper made by chemical modification. The mechanical strength of this single-layer cable insulating paper (the parameters are 0.08mm thick product as an example) The tensile strength is 65N / 10mm, which cannot meet the electrical insulation performance (in the air, the breakdown voltage is 0.88kV), it is not resistant to high temperature, easy to age, and the temperature resistance grade is B (120°C); existing products must be used 0.08mm thick 6 layers and other multi-layers, not only the weight is high, but also the insulation strength cannot be guaranteed, which increases the manufacturing cost of the transformer and brings inconvenience to the operation of the transformer and many other aspects

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