Re: RE- Re: Bombarder xfm
Subject: Re: RE- Re: Bombarder xfm
Date: Tue, 10 Jun 1997 12:59:00 GMT
From: robert.michaels-at-online.sme-dot-org (Robert Michaels)
Organization: Society of Manufacturing Engineers
This message was originally addressed to JIM.FOSSE-at-BJT.NET
and a carbon copy was sent to you.
r>From: jim.fosse-at-bjt-dot-net (Jim Fosse)
[ ... ]
J>> can cause =brief= (sometimes very brief) internal arcing
J>> which in turn can cause an internal open circuit in a trice
J>> (which is also very brief).
J>which would cause (in a thrice) the 3/16" pit 3/4 of the way down my
J>"first" blown neon's secondary. (as I found out after I depotted it).
J>I don't believe that the neon's max current could have caused this
J>sized hole because it just doesn't have enough energy to blow a clean
J>hole in a copper/fish paper/tar composite;) But, the short circuit
J>current from my ~14nF (aka14,000 micky-mikes;) rolled cap (or any low
J>Esr/Esl cap) WOULD blow a hole in the neon's secondary.
Could not your pit be due to sustained internal arcing??
[ ... ]
J>> I'm not saying your basic premise is wrong, only a little
J>> oversimplified -- and apt to be mis-applied by some readers.
J>> Hey -- I'm the guy who unabashedly advocates wholesale over-
J>> volting (but not over =powering=) military-spec.
J>> so we are both brothers of the Cause.
J>Yes it was. I had left out all my assumptions. I stated a rule of
J>thumb without stating ALL the assumptions that go along with it.
J> So Robert M., What rule of thumb do you suggest for this
I'm inclined to rely on physics, rather than rules of thumb
(not that they don't have their place. Sometimes. Maybe)
If I had a "rare find" transformer which I really treasured,
I'd stick in a thermocouple (perhaps a thermistor) and watch
the temperature like a hawk, at least until I was fully
confident about what it'd take.
Even more desirable is to use several thermocouples in
Even more than desirable would be having those theromcouples
feed a temperature alarm -- or a controller which would shut
the system down at excessive temps.
If/when such a transformer is under rebuild, I'd say stick
in a few miniature thermoswitches which would accomplish
the above much more cheaply. They are widely available and
Physics! (that's =my= "rule
of thumb"), in -- Detroit, USA
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