Transformer vacuum paint-dipping process

Abstract

The invention discloses a transformer vacuum paint-dipping process and belongs to the technical field of transformer production. The process includes that the mode of vacuum breaking is adopted during painting, namely when vacuum extraction of a paint dipping tank reaches 0.06MPa and the paint face of insulating paint ascends close to the bottom of a transformer thimble, an air incoming valve of the paint dipping tank is opened to let air in, vacuum breaking state is formed in the paint dipping tank instantly to enable the air pressure inside the paint dipping tank to be an atmosphere; meanwhile, the inside of a transformer is still in an absolute vacuum state of 0.06MPa, the insulating paint in the paint dipping tank can be extruded into 95-98% of the space inside the transformer by the outside atmosphere and enters into the bottom of the transformer due to the gravity in only 1-2 seconds; soon afterwards, in the process when the air incoming state is maintained, the insulating paint continuously and slowly flows into the transformer due to the capillary action of liquid to totally cover the inside space of the transformer. Consequently, insulating effect of the transformer is improved, and moisture resistance, heat resistance, conductivity, magnetoconductivity and mechanical performances of the transformer are guaranteed.

Description

technical field [0001] The invention relates to a transformer vacuum impregnation process, which belongs to the technical field of transformer production. Background technique [0002] In the production process of transformers, the coil windings are usually insulated, that is, a tough and elastic paint film is formed on the outer surface of the coil windings, the purpose is to improve the moisture resistance, heat resistance, electrical conductivity, magnetic conductivity and Mechanical behavior. [0003] In the process of insulating the transformer, since some chemical components in the insulating varnish have a high boiling point, they are not easy to melt at high temperature, so the temperature requirement is relatively high in production. In order to reduce production requirements, most transformer manufacturers use vacuum impregnation process in the process of transformer insulation treatment: put the transformer to be treated in the impregnation tank, and form a vacuu...

AI Technical Summary

Problems solved by technology

However, when using the process technology of vacuum varnish dipping, most manufacturers also maintain a vacuum state during the varnish dipping process, resulting in a vacuum state inside the transformer and the paint dipping tank, and the insulating varnish that reaches the boiling point only depends on the capillary state of the liquid. The effect slowly enters the inside of the transformer; at the same time, due to the low gravity in the absolute vacuum state, the insulating varnish cannot enter the bottom of the transformer, so that it cannot completely cover the outer surface of the transformer coil, thereby reducing the insulation effect of the transformer , affecting its moisture resistance, heat resistance, electrical conductivity, magnetic permeability and mechanical properties