Thanks for the guidance Ian. I'll do a little more digging through the
archives. Dennis
On Fri, Dec 22, 2017 at 5:05 PM, Ian McLean <austesla@xxxxxxxxxxxxxx> wrote:
> Hi Dennis,
>
> A quick search through the Pupman archives will give you a much better
> answer as to why an LTR cap is preferred for NST coils, than what I could
> provide in a short post here. STR is often used for pole pig coils as
> building an LTR coil for such large systems can become prohibitive.
>
> For example, this post my David Rieben back last year explains it well:
>
> https://www.pupman.com/listarchives/2006/Mar/msg00416.html
>
> Cheers,
> Ian
>
>
> On 23/12/17, 7:56 am, "Tesla on behalf of dennis otmaskin"
> <tesla-bounces@xxxxxxxxxx on behalf of dotmaskin@xxxxxxxxx> wrote:
>
> >Thanks Ian for your reply! What you say is encouraging to hear. If you
> >don't mind, I have one more question...
> >
> >Java TC indicates, for my 15/135 NST, that Resonant Cap Size would be
> >0.0239uF. I understand that bad things happen when using resonant cap
> >size. So I'm trying to decide on whether to use a 0.03uF cap or a .015uF.
> >I've got one of each. The .03 cap is pretty close to the indicated .0358
> >LTR Cap Size for a static gap. On the other hand if I plug the .015 cap
> >into Java TC, it shows a dramatically greater rate of Breaks Per Second
> >and
> >possibly a few more inches of spark length. My question is is there any
> >potential problem with resonant rise with the .015 cap. I.e., is the .015
> >cap value far enough from the resonant cap size to be safe?
> >
> >Thanks again for your help, Dennis
> >
> >On Thu, Dec 21, 2017 at 11:55 PM, Ian McLean <austesla@xxxxxxxxxxxxxx>
> >wrote:
> >
> >> Hi Dennis,
> >>
> >> If you have proper RCD¹s installed, it is unlikely you will trip a 15A
> >> circuit with 18A at least for the sort of runs lengths you do on a Tesla
> >> coil.
> >>
> >> I regularly ruin my tube coil at between 30A-40A from a wall socket.
> >>The
> >> RCD is only 20A, but it has never tripped even with a 2 minute run.
> >>
> >> Cheers,
> >> Ian
> >>
> >> On 22/12/17, 2:40 pm, "Tesla on behalf of dennis otmaskin"
> >> <tesla-bounces@xxxxxxxxxx on behalf of dotmaskin@xxxxxxxxx> wrote:
> >>
> >> >Hi I'm hoping someone from the list can offer advice some advice and
> >> >suggestions. I am replacing the 15/60 NST on my current static gap
> >>coil
> >> >with a de-potted NST with some shunts removed so that it puts out
> >>15000v @
> >> >135mA.
> >> >
> >> >Running different designs on Javascript Coil Designer, I'm finding that
> >> >the
> >> >Effective Input Current (current draw?) runs over 18 rms amps. My wall
> >> >outlets in the garage are all 15 amp. So if I'm understanding this
> >> >correctly, it looks like I would be constantly tripping the circuit
> >> >breaker
> >> >when running the coil at full variac voltage. I've run different cap
> >> >sizes
> >> >through Java TC but cant seem to get around the 18 amp draw.
> >> >
> >> >To get the current draw to just below 15 amps, I would have to dial the
> >> >variac down to 106 volts which would reduce the spark length
> >> >substantially. I'm thinking that I am pretty much stuck with a systems
> >> >that is limited to 106 volt input. Do you think this is the case? I'm
> >> >hoping that I don't have to rewire my garage outlets for 20 amps just
> >>for
> >> >my coil. Any suggestions would be most appreciated.
> >> >
> >> >Thanks, Dennis
> >> >_______________________________________________
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> >>
> >>
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> >>
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