ORIGINAL MESSAGE:
On Fri, 11 Jun 2010 11:08:10 -0700, Patrick Barthelow
<apolloeme@live.com> wrote:
>For a KW level HV transformer, is there much difference between the temp that
>you can touch and measure, say at the outside laminations, and perhaps the
>more important temperatures in the core center, and the copper wire, bobbins,
>windings, and paper/plastic insulation materials that we cannot see, inside?
>
>
>
>And, a related question, from a cold room temperature start, if you could
>measure the surface temperature of the laminations of a, say, Heathkit SB 220
>amp that was being used with a lot of transmit time, on CW at 1KW out, How
>long would it be before the outside lamination temperature could give a
>representative temperature of the more critical inside core temperatures?
>Could there be, say, 50 degree F temperature difference between inside and
>outside when the Amp is producing 1KW RF output? If you can cool the outside
>of the transformer with continuous airflow from a muffin fan, or better,
>would that reduce significantly the inside core temperature?
REPLY:
Those are all good questions. Wish I knew the answers. The only thing
for sure is if the outside seems excessively hot, the inside is more
so.
73, Bill W6WRT
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