# RE: [TCML] PFC reflection back to current control.

```Hi Deano,

I have an older version of JavaTC 9.1, which is good for quick input.
Assuming that part of the program has not been largely redone, a 11400, 5kva
transformer with 240v rating and 240 applied returns ~ 230uf. This should be
the honest impedance of the transformer with stock values. I have lots of AC
motor run caps in the 370v volt range.

Now Barton A. will be annoyed. I use the online version for coil geometries
and accurate calculations though. The equations are plentiful on the net for
calculating this value given enough known values. This is a late GE
Potential Transformer and is well documented.

I talked to the engineer who designed it one day to find out if grounding H2
was ok, which it is and has been. Should I double check this value? The 50uf
came from a series of two 100uf's. I could put three in series if it is that
critical though most caps have 20% tolerance anyway and I blew up my Chino
meter with lots of smoke recently - fuse intact;-^)

How does the reflected reactance play out?

Jim Mora

-----Original Message-----
From: tesla-bounces@xxxxxxxxxx [mailto:tesla-bounces@xxxxxxxxxx] On Behalf
Of David Dean
Sent: Tuesday, March 31, 2009 8:55 PM
To: Tesla Coil Mailing List
Subject: Re: [TCML] PFC reflection back to current control.

Hi Jim

Just curious, is the 250uF the total of the caps you have available?
Or is that a calculated figure for what you need, and if so, how did you
come up
with that number?

later
deano

On Tuesday 31 March 2009 09:36:45 pm Jim Mora wrote:
> Hello All,
>
> I am finishing up my HV cabinet. I have a 14400/240@5KVA GE Potential
> Transformer. It can be tapped up to 107% output voltage. My control
cabinet
> has 1256D variac voltage control and a fair sized satuarble reactor for
> current control. I am able to drive 0-280V@0-45amps (12,600VA) through the
> reactor into a near short without it even getting warm.
>
> I have some high quality PFC caps that calc out to about 250uf for the
> transformer PFC. Here's the question: What is the reflected back effect on
> the reactor? I haven't played with +-J in a long time! Mostly it is -Xc
+Xl
> as there is little resistance involved. Clearly this is also a factor with
> other inductive current control solutions. Maybe I should just leave them
>
> Jim Mora
>
> _______________________________________________
> Tesla mailing list
> Tesla@xxxxxxxxxxxxxx
> http://www.pupman.com/mailman/listinfo/tesla

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