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Re: Racing Spark Prediction

Original poster: "Gerry  Reynolds" <gerryreynolds@xxxxxxxxxxxxx>

Hi Dmitry,

Hope I got it spelled correctly :-)) I read the 1998 report that Terry wrote about racing sparks vs quenching and I too think there is a mechanism here. Im thinking with normal coupling in the TC, there are two fundamental frequences (aka frequency split). These beat with each other with a frequency that is the difference between the two fundamentals. Normally, this frequency is low and the waveforms decay before the completion of the first period of the beat. However, if the sparkgap doesnt quench, energy sloshes back and forth between the secondary and primary and doesnt decay fast enough for the beat to occur. If this thinking is correct, maybe this explains how quenching (or lack of) can be one cause (but not the only cause) of racing arcs. Even with perfect first notch quenching, I think, racing arcs can be caused by excessive coupling.

Gerry R.

Original poster: dest <dest@xxxxxxxxxxxxx>

> Original poster: FutureT@xxxxxxx

> There is a TC operation mode that can produce a great number of
> racing sparks all over the secondary.  I don't remember anyone
> mentioning this but they may have.  One time I was testing a
> static series gap under relatively high power.  The gap was not
> cooled so it heated up fairly quickly causing it to either power-arc
> and/or quench poorly.  When the gap was still cool, there were
> no racing sparks.  As soon as the gap heated, a great number
> of racing sparks appeared.

i`m starting to think, that racing has something to do with the first
notch quenching, probably not exclusively with a fact of quenching
itself, but also with set of conditions that assist in it - more
distance between pri & sec, good streamers loading, e.t.c.
and of coz the fact that secondary after quench may ring freely on
it`s own natural freq only is helping too.

do you remember any racing on first notch in your coils?
can it be such way, that most of D.C.`s coils quench after first
energy transfer, because of relatively low coupling?