A vacuum pressure impregnation process for dry-type transformer coils

Abstract

The invention discloses a vacuum pressure paint-soaking process for a dry-type transformer coil. The vacuum pressure paint-soaking process sequentially comprises the following procedures: a paint liquid viscosity adjusting procedure, a drying procedure before paint soaking, a first paint-soaking procedure, a drying procedure, a second paint-soaking procedure and a curing procedure; and the first paint-soaking procedure adopts a pressure paint-soaking mode, and sequentially comprises the following steps: a vacuum supply step, a paint transfer step, a pressurized paint-soaking step and a paint dripping step. According to the vacuum pressure paint-soaking process for the dry-type transformer coil disclosed by the invention, second paint-soaking is adopted; the pressure paint-soaking mode is adopted by the first paint-soaking procedure; and an atmospheric pressure paint-soaking mode or the pressure paint-soaking mode is adopted by the second paint-soaking procedure, so that the condition that the transformer coil is covered with an insulating paint in an omnibearing manner can be ensured; the insulating effect of the transformer is further improved; and the anti-moisture performance, the heat resistance, the conductivity, the magnetic conductivity and the mechanical property are ensured.

Description

technical field [0001] The invention relates to a paint dipping process, in particular to a vacuum pressure paint dipping process for a dry transformer coil. 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, in order to improve the moisture resistance, heat resistance, electrical conductivity and magnetic permeability of the coil windings. and mechanical properties. [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 adopt vacuum impregnation process in the process of transformer insulation treatment: put the transformer to be treated in the impregnat...

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 in the varnish dipping tank, and the insulating varnish that reaches the boiling point only relies on liquid 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 transformer's The insulation effect affects its moisture resistance, heat resistance, electrical conductivity, magnetic permeability and mechanical properties

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