Epoxy coating paper

Abstract

The invention discloses epoxy coating paper. The epoxy coating paper is provided with insulating paper; a coating layer is arranged on the outer surface of the insulating paper; the coating layer is made from special modified epoxy resin; and the special modified epoxy resin comprises the following ingredients in parts by weight: 45-55 parts of 0194 epoxy resin, 15-25 parts of F46 epoxy resin, 10-20 parts of 601 epoxy resin, 5-15 parts of 594 curing agent and 3-7 parts of diamino diphenyl sulfone. By adoption of the epoxy coating paper, the voltage withstand level of layer insulation of an oil-immersed transformer can be improved, the dielectric loss can be reduced, the structural strength of the transformer coil can be strengthened, the operating reliability of the transformer can be improved, and the production cost of the oil-immersed transformer can be lowered.

Description

technical field [0001] The present disclosure generally relates to the field of transformers, specifically to the field of transformer insulating paper, and in particular to an epoxy-coated paper. Background technique [0002] Cable paper is generally used for interlayer insulation of oil-immersed power transformer winding coils. At present, there are two types of cable paper specifications, 0.08mm and 0.13mm. In the production of transformers, in order to minimize the types of specifications used for cable paper, it is convenient for procurement and production. At present, in the transformer production industry, 0.08mm cable paper is usually used for use, and the number of sheets of cable paper is generally selected according to the breakdown voltage of 4.75kV / sheet after oil immersion, resulting in the interlayers of each winding coil being composed of multiple layers. The cable paper is used for insulation and isolation, but the traditional winding structure leads to th...

AI Technical Summary

Problems solved by technology

At present, in the transformer production industry, 0.08mm cable paper is usually used for use, and the number of sheets of cable paper is generally selected according to the breakdown voltage of 4.75kV / sheet after oil immersion, resulting in the interlayers of each winding coil being composed of multiple layers. The cable paper is used for insulation and isolation, but the traditional winding structure leads to the unreasonable design of the winding coil structure when laying the cable paper, which leads to a large amount of cable paper used when the insulation level is met.

On the one hand, it becomes a waste of cable paper, on the other hand, it also increases the volume of the transformer winding structure, which affects the overall structure and self-weight of the transformer, and the production cost also increases. Difference