[Amps] RE : MW Oven Transformer question

[R at contesting.com]

On Mar 22, 2006, at 5:01 PM, Bill Turner wrote:

> ORIGINAL MESSAGE:
>
> At 12:11 PM 3/22/2006, Larry Carman wrote:
>
>> Wouldn't the insulation between windings eventually saturate with the 
>> oil
>> thus allowing better heat transfer from deep inside?
>>
>> Larry N5BIP
>
> *********** REPLY SEPARATOR ***********
>
> Good quality transformers are already impregnated with varnish, so
> the oil would not penetrate. The varnish does help to conduct heat
> out, but since it does not move like coolant in a radiator, the
> effect is small.

The trouble with varnish is that it leaves air pockets inside the 
transformer because it's volume decreases as it dries,  This is not the 
case with resins that use a hardener.

>
> Bill, W6WRT
>
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Rich Measures, 805.386.3734, AG6K, www.somis.org