Re: PFC Question

["Tesla list" <tesla@xxxxxxxxxx>]

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

Hi Gerry,

Oops! I forgot about the ballast. Thank you for bringing
that to my attention. Yes, the ballast on one leg of the va-
riac's output between the variac and the transformer pro-
bably would add some "poop" to the equation, wouldn't
it? After all, this would place the ballast in series with the pole
pig. I really forgot to consider the seriesed inductance that the 
ballast would add to the circuit but it is definitely
an inductive aparatus, just like the transformer and
the variac. So if I were so inclined to reinstall the PFCs, they 
would need to go DIRECTLY across and in parallel
with the 240 volt input lugs of the pig, right? That should
remove the seriesed ballast L from the picture. I may try
temporarily connecting the caps directly across the input
lugs of the pole pig and see if that makes any difference.

David Rieben


----- Original Message ----- From: "Tesla list" <tesla@xxxxxxxxxx>
To: <tesla@xxxxxxxxxx>
Sent: Thursday, November 03, 2005 9:40 AM
Subject: Re: PFC Question


> Original poster: "Gerry  Reynolds" <gerryreynolds@xxxxxxxxxxxxx>
> Hi David,
> Where is your ballast if the output of the variac is connected 
> directly to the input of your PIG.
> Gerry R.
>
> > Original poster: "David Rieben" <drieben@xxxxxxxxxxxxxxx>
> >
> > Hi Ed,
> >
> > I must not have explained myself properly.
> > My PFC caps were directly across the out-
> > put terminals of the variac and consequently
> > across the input terminals to the transformer.
> > That's in parallel with the input terminnals of
> > the transformer, isn't it? And the variac would
> > start the resonant saturation hum even with the trans-
> > former disconnected from it, or with no load.
> > I even tried removing one of the 100 uFd
> > caps to make it 600 uFd PFC but that didn't
> > really seem to help so at that point, I just decided
> > remove them altogether.
> >
> > David Rieben