RE: Stiff 24kv DC Power Supply, Filter Caps

["Tesla list" <tesla@xxxxxxxxxx>]

Original poster: "Leigh Copp" <Leigh.Copp@xxxxxxxxxxx>

S.F. is for Service Factor, which essentially means that you can run at
1.15 times the nameplate rating without killing the motor.

It has no relationship to power factor.

Your P.F. is going to vary with load. The closer you are to rated kW,
the higher the P.F. Normally expect it to be around 0.8 best case, and
very typically more like 0.7 or lower.

Leigh

-----Original Message-----
From: Tesla list [mailto:tesla@xxxxxxxxxx]
Sent: October 11, 2006 11:10 PM
To: tesla@xxxxxxxxxx
Subject: RE: Stiff 24kv DC Power Supply, Filter Caps

Original poster: "Jim Mora" <jmora@xxxxxxxxxxx>

The on the motor is SF 1.15 (relationship?0 I don't know much about the
transformer. As I said this was a PS for missile site radar. I doubt
power
was insubstantial...from the Nikie days. They were all over the corn
fields
from me as a kid.

-----Original Message-----
From: Tesla list [mailto:tesla@xxxxxxxxxx]
Sent: Wednesday, October 11, 2006 10:47 AM
To: tesla@xxxxxxxxxx
Subject: RE: Stiff 24kv DC Power Supply, Filter Caps

Original poster: "Leigh Copp" <Leigh.Copp@xxxxxxxxxxx>

Power factor correction on the primary of your three phase transformer
can certainly reduce your input current, but only if the power factor
was low to begin with. If you power factor is near unity to start off
with, and you add correction capacitors, your current will actually go
up! (Your utility will be happy however).

Leigh



-----Original Message-----
From: Tesla list [mailto:tesla@xxxxxxxxxx]
Sent: October 10, 2006 9:08 PM
To: tesla@xxxxxxxxxx
Subject: RE: Stiff 24kv DC Power Supply, Filter Caps

Original poster: "Jim Mora" <jmora@xxxxxxxxxxx>

Hi Phil,

You got me thinking about this.

On the other hand the large choke will store a fair amount of energy
too.
Therefore, the recharge cycle charge will put pretty big demands on the
transformer. It may just come down to experimentation. Additional
opinions
welcome.

What about power correction on a three phase transformer. That would be
player in this dance as well, yes?

Long Sparks,
Jim Mora


-----Original Message-----
From: Tesla list [mailto:tesla@xxxxxxxxxx]
Sent: Tuesday, October 10, 2006 5:10 AM
To: tesla@xxxxxxxxxx
Subject: Re: Stiff 24kv DC Power Supply, Filter Caps

Original poster: "Phil Rembold" <prembold@xxxxxxxxx>

Jim,

Most of the layouts I've seen have the smaller value cap near the
load, but since you are driving a coil you may want to reverse this
so you can dump more power into the primary each bang.

Phil
TCBFW


On 10/9/06, Tesla list <<mailto:tesla@xxxxxxxxxx>tesla@xxxxxxxxxx>
wrote:
Original poster: "Jim Mora"
<<mailto:jmora@xxxxxxxxxxx>jmora@xxxxxxxxxxx>

Hello All,

Having said all that, here's my question: I have a 1mf 40kv bank
(with bleeders) and a 4mf 40kv bank(with bleeders) full bleed time
will be necessarily one minute because of the power involved. The
power supply has a 150H (R=800ohms) Filter Choke on the output.

I can't remember, from way back, which side of the choke gets the
larger value of capacitance. I'm certain that it effects the ripple
cancellation. I do seem to remember that the cap ratio was 8 to one;
but, this is already lethal enough, so 4 is good for me. Can anybody
give me some guidance taking into consideration the gap running
asynchronously (maybe a misnomer in DC) and the primary cap drain at
various BPS'???

As Always, Thanks for your help,
Jim Mora