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Re: remote location of NSTs - away from coil base?



Original poster: "David Rieben" <drieben@xxxxxxxxxxxxxxx>

Hi Gary,



Original poster: "Gerry  Reynolds" <gerryreynolds@xxxxxxxxxxxxx>
>
Do you have a pointer to a document explaining this affect?? I did a google on it and what I found seems to indicate a transmission line reflection affect.

Wouldn't  "transmission line reflection effect" be capacitance based?
I don't know myself but the coax cable is abviously going to add a
capacitive effect and at a certain capacitance, it would have to achieve
resonance depending upon the circuit component parameters, wouldn't
it?

.
BTW, since Blumlein is a result of capacitive resonance on the line,

Could you describe what the coax capacitance is resonating with?? topology???

I would assume the transformer and the circuit components. I'm not
sufficiently educated in this subject to discuss theory of operation.
All I can report is that I do NOT have any huge voltage rise at the out-
put bushings of my pig by using a ~40 ft length of 75 kVDC x-ray cable to
run the high voltage output from my pig to the base of my coil. The trans-
former is a standard 15 kVA rated 14,400/240 volt double bushing,
single phase, pole mount distribution transformer and the primary ca-
pacitor is a .1 uFd (measured cap .0985 uFd), 50 kVDC Hipotronics
pulse capacitor obtained from Jeff Parisse of KVA Effects. I used the
inner conductor core of the cable for the "hot" and the outer braid as
the "ground", so the transmission line as a single cable and the 120V
for the ARSG in Romex shield as the other line -  just 2 cables from
the control panel to the base of the coil ;^).

David Rieben