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Re: oil dielectric
Original poster: "by way of Terry Fritz <twftesla-at-qwest-dot-net>" <Xyme3-at-aol-dot-com>
Sorry i sent the last EM by accident, this is the conclusion, the other half
being discussed in the last letter.
<< The oil actually keeps the coil cool by damping molecular
The thermal effect is by being heated by hot spots
(core eddy currents, coil resistance losses), then flowing,
by natural convection, or, less commonly, pumped
circulation, to a cooler spot where it can dump heat.
Sometimes the cool spot is aided by heat sinks ('fins').
cf any text on transformer design.
I think you are correct here also, fins would help
> The way I wound the coil was to wind it on a 3.5" OD
> PVC pipe and then slide a 4.5" OD PVC pipe over it and seal
This makes me nervous.
> both ends. I left a quarter inch hole in the top plug and used
> something like a turkey baster to fill the coil with oil. When I
> was done, I sealed the small hole.
I say nervous because a sealed container, can, if heated,
even by a fault, 'rapidly disassemble': Explode.
Unlikely, probably, here, but possible. (Power
transformers can and have exploded, when not vented.)
I think there are some relief valves that contain the additional material
pushed out by heating. When the oil cools the valve allows the oil to flow
back into the container.
PS Thanks for the comments, you have pointed out some mistakes that could
easily be made by an amature, like me.