Have you metered your mains voltage? I had a similar issue with flickering
lights and there was a fault in the neutral connection to the house where
the wire to the pole meets the house. So depending on the load balance
between the two "phases" (not sure what the correct word is), one side was
too high and the other too low. If you see your voltage isn't 115-120V,
definitely call your utility company and have them check it out!
Regards, Gary Lau
MA, USA
On Wed, Nov 25, 2015 at 8:00 PM, Vincent D'Amore <teslaburton@xxxxxxxxx>
wrote:
> Terry and Dave
>
> Yes slow blo fuses were used.
> Oddly enough I've been having some sort of power fluctuations at my house.
> Full house light flicker once in a while too. Sometime back the power
> company had to replace the connectors to my main but as of recent I've
> notice the flicker again. I'm wondering if that has anything to do with it.
> I don't have any power correction caps on my nst's maybe it's just time
> to graduate to something more robust and focus on that power issue :)
> I'd really like to find a potential transformer and switch to a rotary
> spark gap. I'll post pictures of my setup soon.
>
> Vincent
> P.S. I used to be on this list about 7 years ago. Just getting back into
> it now.
>
> > On Nov 25, 2015, at 12:31 AM, Terry <terry@xxxxxxxxxx> wrote:
> >
> > Vincent,
> >
> > Sorry I did not see Dave's reply before I replied. I agree with Dave.
> >
> > Terry Leonard
> >
> >
> >> On 11/24/2015 7:58 PM, David Speck wrote:
> >> Vincent,
> >>
> >> What is the rating of the fuses you are using? 10 amps?
> >>
> >> Are they slow blow or fast blow fuses?
> >>
> >> Many old-school name brand variable autotransformers (Variac,
> Powerstat) can handle double their rated nameplate current ratings for
> short runs of 30 - 60 seconds without being damaged. Can't say the same
> for some of the cheap Asian imports, though.
> >>
> >> A Variac is not the part of the circuit that provides current
> limiting. That is established by the NSTs themselves.
> >>
> >> If you want to run 4 NSTs simultaneously, you will need a Variac big
> enough to provide the all current they require.
> >>
> >> Adding power factor correction capacitors (PFC) to the transformer
> input may help manage their current drain.
> >>
> >> Dave
> >>
> >>> On 11/24/2015 7:46 PM, Vincent D'Amore wrote:
> >>> Hi All
> >>>
> >>> Recently I've been running my coil controlled by a 10amp variac. I'm
> running two parallels 12/30 franceformer neons sign transformers and have
> been running this way for several years but as of late I keep blowing fuses
> on the variac about every 4th run. I'm not sure if or what has weakened
> over time. I would like to run my coil with a much larger power supply but
> that obviously won't go over well with my 10amp variac and I certainly
> don't want to move forward until I know the weakest point. Any suggestions?
> Also if I do go with a larger supply I'm thinking of 4 12/30's in parallel
> but don't know what to do for current limiting. Larger variac? Something
> else? Thanks for any advice.
> >>>
> >>> Vincent
> >>
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> >>
> >>
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