Dispensing insulation paper suitable for wind power and solar transformers, and application thereof

Abstract

The invention discloses a dispensing insulation paper suitable for wind power and solar transformers, and an application thereof. The dispensing insulation paper comprises a first heatproof insulationpaper, a middle layer formed by a polyimide film and a second heatproof insulation paper which are sequentially stacked, the first insulation paper and the middle layer are bonded through an adhesive, and the second insulation paper and the middle layer are bonded through the adhesive, wherein the adhesive is a composite adhesive, and the composite adhesive includes a PU adhesive and an epoxy adhesive, and a mass ratio of the PU adhesive to the epoxy adhesive is (8-10):1; the epoxy adhesive includes modified epoxy resin and an epoxy resin curing agent according to a mass ratio is (4-8):1; andthe modified epoxy resin comprises liquid epoxy resin and solid epoxy resin according to a mass ratio of (0.5-2):1, and the adhesive is dispensed on the outer surfaces of the first and second heatproof insulation papers. The invention also discloses the application of the dispensing insulation paper in the wind power transformers and solar transformers. The dispensing insulation paper has the advantages of high heatproof grade, good mechanical strength and good breakdown voltage, and is extremely suitable for the interlayer insulation of the wind power and solar transformers.

Description

technical field [0001] The invention belongs to the field of insulating materials, in particular to an insulating material suitable for wind power and solar transformers, in particular to a dispensing insulating paper suitable for wind power and solar transformers and its application. Background technique [0002] At present, the insulating material used for the interlayer insulation of existing wind power, solar energy, and oil-immersed transformers is mainly dispensing insulating paper. Although the current cable paper dispensing insulating paper has achieved good results in certain aspects, such as resisting However, in actual use, it still cannot meet the requirements of wind power and solar transformers in terms of heat resistance, mechanical strength, flexibility and tear strength. [0003] For example, Chinese patent CN204102649U discloses a rhombic dispensing insulating paper that adopts polyester film, including: the first layer of cable paper, the middle layer of p...

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Problems solved by technology

[0002] At present, the insulating material used for the interlayer insulation of existing wind power, solar energy, and oil-immersed transformers is mainly dispensing insulating paper. Although the current cable paper dispensing insulating paper has achieved good results in certain aspects, such as resisting However, in actual use, it still cannot meet the requirements of wind power and solar transformers in terms of heat resistance, mechanical strength, flexibility and tear strength, etc.

[0003] For example, Chinese patent CN204102649U discloses a rhombic dispensing insulating paper that adopts polyester film, including: the first layer of cable paper, the middle layer of polyester film, and the second layer of cable paper; The first layer of adhesive is closely bonded to the middle layer of polyester film, and the second layer of said middle layer of polyester film is tightly bonded to the second layer of cable paper by the second layer of adhesive applied evenly; It is poor in terms of breakdown voltage and oil resistance, but its heat resistance level is low and can only reach level B, which is difficult to meet the requirements of wind power and solar transformers. At the same time, it is still slightly inferior in other aspects such as mechanical strength. insufficient

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