Insulators Varnishes

Our Insulators Varnishes

SEG insulating varnishes have four different impregnation techniques used depending on the processing equipment, the type, the quantity of parts to be treated, and the desired result.

spray

This process is used for unit impregnation. It requires little material, hence its appeal.

Simple hardening

The conditions for a good impregnation with this process are:

quenched at room temperature.
in certain cases, in order to promote the penetration of the varnish into the core of the winding, a preliminary preheating of the parts to a temperature of 50 ° C maximum is recommended.
drainage proportional to the mass of the impregnated material and to the ventilation of the installation.
temperature rise from ambient to the recommended temperature.
bearing for solvent evaporation.
temperature rise and polymerization.

Vacuum and pressure in autoclave

This version, more technical than the previous ones, is used in cases where penetration to the heart of difficult parts is necessary:

dehydration at 130 ° C.
slow admission of varnish by partial vacuum to avoid bubbling effects.
pressurization (from 1 to 3 bars).
draining.
gradual rise in temperature with strong ventilation.
bearing.
rise to the recommended temperature *.
polymerization*.

* refer to the documentation for the chosen insulating varnish.

Drop-by-drop impregnation
Process mainly requiring two-component insulating varnishes. Its principle is: preheating winding to 80 ° C by Joule effect or other. rotation of the winding around its axis between 30 and 60 revolutions / minute. casting of the resin using nozzles on the hot and rotating part. In contact with the hot part, the resin becomes fluid and penetrates to the core, then the coil is filled by capillary effect. with the rotation maintained, turn on the heating. The resin gels quickly (a few minutes). a post-cooking will perfect this reaction and give the resin its optimal quality.

Drop-by-drop impregnation

Process mainly requiring two-component insulating varnishes.

Its principle is:

preheating winding to 80 ° C by Joule effect or other.
rotation of the winding around its axis between 30 and 60 revolutions / minute.
casting of the resin using nozzles on the hot and rotating part. In contact with the hot part, the resin becomes fluid and penetrates to the core, then the coil is filled by capillary effect.
with the rotation maintained, turn on the heating. The resin gels quickly (a few minutes).
a post-cooking will perfect this reaction and give the resin its optimal quality.

This information is based on our current knowledge and the results obtained, in all objectivity, in our laboratory. They are given to the best of our knowledge, and must be adapted to each particular case, but do not imply any commitment on our part as to the use of the product.

Our sales teams are here to help you find the best product for your application.

For any inquiries, do not hesitate to contact us.

Thermal class

The thermic class of an electrotechnical product such as a transformer, for example, determines the maximum temperature at which insulators materials and insulation systems guarantee thermal stability against aging. The thermal classes and the temperatures assigned to them are listed in the table below. These temperatures are the actual insulation temperatures and not the transformer temperature rises or the maximum ambient temperature.