SEG electrical insulators varnishes

impregnation techniques for electrical insulators varnishes :

SEG electrical insulators varnishes have four different impregnation techniques used depending on the implementation material, the type, the quantity of parts to be treated, and the desired result.

First of all by watering:

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

But also by simple quenching:

here are the conditions for a good impregnation with this process are:

• quenched at room temperature.
• in some cases in order to promote the penetration of the varnish into the core of the winding, preheating the parts beforehand 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.

Also possible by vacuum and pressure in an 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.
• rise to the recommended temperature *.
• polymerization*.

And finally, by drip impregnation:

This process mainly requires two-component insulators varnishes, here is the principle:

• preheating of the 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 heart, then the winding is filled by capillary effect.
• with the rotation maintained, turn on the heating. The resin gels quickly (a few minutes).
• a post-curing will make it possible to perfect this reaction and give the resin its optimum quality.

Please note that 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.

You can request the technical sheets of our electrical insulators varnishes on this page.

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.

For any request for information on our electrical insulators varnishes, do not hesitate to contact us.