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PT's in series (was 110KV BIL?)
Original poster: "Ray Haynes by way of Terry Fritz <twftesla-at-uswest-dot-net>" <ray.haynes-at-home-dot-com>
Bill is your statement about not running the PT's in series based on the VA
ratings and how the higher voltage will cause higher current thus
overloading the PTs?
If I was to run more turns on the primary and a smaller capacitance but
higher voltage cap (keeping the same primary resonate frequency), would that
take advantage of the higher (28.8KV) voltage without overloading the PTs?
Also with a smaller cap and higher voltage that appears to lower the current
in the primary reducing I squared R losses.
I have some foggy memory about a Tesla's coil output voltage going up as the
square of the primary voltage (think I read it on this list). Or has the
thinking changed? That would be the only reason why I would want to run them
I'm thinking if this wasn't true then why is everyone messing with all this
high voltage on the primary in the first place? Just run a few hundred volts
with big caps and a one turn primary with a large copper bar. Of course
there would be problems switching the very high current pulse but
empirically it seems to indicate that a larger primary voltage is better.
Original poster: "by way of Terry Fritz <twftesla-at-uswest-dot-net>"
BIL stands for "basic impusle level". It is an IEEE standard, for
impulse voltage level (withstand) peak voltages in a (simulated)
lightning strike. Whereas the insulation of a P.T. may have a
110 KV BIL rating, unless you have an (unususally large) P.T.
i.e., larger then a nameplate rating of 1,500 VA, I would NOT
connect two units in series (on the high voltage side). 14.4 KV
is more then ample to drive any medium-sized Tesla coil