Insulated impregnating process for high-frequency transformers

Abstract

The invention discloses an insulated impregnating process for high-frequency transformers. The method can significantly improve the surface quality of high-frequency transformers and ensure that the surface of a transformer is completely covered; gaps between iron cores and windings are completely filled; and paint layers are glossy and free from paint protrusions, wrinkled skin and large-area flowing paint. The process is implemented through a technical scheme comprising the following: a) a step of impregnating with paint, which is to impregnate an iron core component with high-temperature epoxy glue, put the iron core component into a sealed container and bake for 2 hours; b) a step of winding, which is to wrap the iron core component in a glass cloth belt for insulation, wind primary and secondary windings and tie the glass cloth belt for insulation; c) a step of impregnating with paint, which is to bake the obtained product at 70+ / -10 DEG C for 0.5 hour; d) a step of baking, whichis to put the obtained product into a vacuum tank, vacuumize the vacuum tank, maintain pressure for 10 minutes, raise pressure to normal pressure, pressurize to between 0.3 and 0.4 MPa, maintain pressure for 20 minutes and bake for 2 hours; and e) a step of packaging, which is to pour high-temperature epoxy glue and put the obtained product into the same sealed container for baking. The high-frequency transformers manufactured by the process have the advantages of good thermal stability, excellent insulation performance and capability of completing the boost output of high-energy pulses.

Description

technical field [0001] The invention relates to an insulation treatment process for a high-frequency transformer. More specifically, the present invention relates to the high-frequency transformer having good thermal stability and excellent insulation performance after being processed by the method, and capable of completing boosted output of high-energy pulses. Background technique [0002] Since most of the high-frequency current passing through the high-frequency transformer is a "non-sinusoidal wave", in the prior art, in order to improve the insulation performance of the transformer, increase the mechanical strength, prevent moisture, reduce production costs, and meet the special requirements of the product performance, the transformer is usually impregnated with paint. Moreover, the quality of transformer insulation varnish treatment directly affects the electrical insulation performance of high-frequency transformers. High-frequency transformers with excellent insula...

AI Technical Summary

Problems solved by technology

Traditional insulation treatment methods include immersion, continuous immersion, drip immersion, rolling immersion, and vacuum impregnation. Except for vacuum impregnation and drying, other impregnation processes have long immersion and drying cycles, high energy consumption and low efficiency, and harmful gases in the operating place. There are serious physical hazards for operators, and the environmental pollution is particularly serious.

Moreover, the process is complicated, the soaking time is long, and a large amount of solvents are volatilized during the baking process, which pollutes the environment and affects the health of production workers.

In addition, due to the inhomogeneity of dipping paint flow, air bubbles are likely to be generated during pouring. The surface of the transformer is not completely filled with paint film, and large areas of paint flow, paint bumps, and wrinkles will occur on the surface, resulting in the overall electrical insulation performance of the transformer failing to meet high-energy pulse output. Require