impulse_transformer_windings_construction

Hi,

Most of our reports do specify that the transformer should be varnished.

We describe the benefits of varnishing and impregnation to the end customer. Whether or not to use vaccum impregnation or to only dip varnish the transformer is customers choice but we do describe in detail in our application notes

http://www.powerint.com/sites/default/files/product-docs/an18.pdf

Regards PI-Sarek

Thank you. I asked that question because I understand the phrase "do not impregnate under vacuum" as a some kind of caution - i.e. "if you do impregnate lacquer into the bobbins under vacuum, they won't work properly", or smth. about.

But it seemes to me that vacuum impregnation of insulation lackuer into the windings, between their turns, is much better for the high frequency' impulse transformers (in the sense of reliability) than simple varnishing their surface only. Am I right?

AND - thank you for the PDF !

Hi

Choice of a technique is often related to the requirements of the application. Dip varnishing is often adequate and economical and is preferred by various customers.

It is true that vaccum impregnations results in the varnish being sucked into small cavities in the windings of the magnetic structure and would be preferred in some applications. 

Regards PI-Sarek