Re: Hot spot

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "by way of Terry Fritz <teslalist-at-qwest-dot-net>" <dhmccauley-at-spacecatlighting-dot-com>


Sounds like a nick in the wire.



 > Hello Coilers,
 >
 > I ran my coil briefly yesterday and had an odd occurance.  After ten or
 > so seconds of run time at very reduced power a hot spot developed about
 > five or six turns up from the bottom of my secondary.  The run wasn't a
 > normal one in that the coil sounded "rough" and the safety gap firings
 > where more frequent, but the streamers seemed their usual length for
 > the power I was running.
 >
 > After shutting down and safing the coil, I examined the secondary and I
 > found an area where the epoxy resin appeared to have been burned off by
 > heat but with no charring.  The exposed turns seem intact save for some
 > of the coating being missing.  There was no indication of an arc-over
 > to the inner primary turn which is about an inch away, nor had I seen
 > such an arc when this hot spot appeared.  The hot spot looked like an
 > orangy-green ball about half an inch in diameter and was quite bright.
 >
 > Any ideas as to what caused this?  Any suggestions as to measures that
 > I could take to prevent a re-occurance?  The configuration of the coil
 > was exactly the same as I've been using for months with no problems.
 >
 > 73, Weazle, VE3EAR/VE3WZL
 >
 > "Don't take life so seriously, nobody has survived it yet!"
 >
 > Listening: 7,055, 147.030+, and 442.075+
 > http://www.hurontel.on.ca/~weazle
 >
 >
 >
 >
 >