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Fo vs. performance

To: teslaatpupmandotcom

Subject: Fo vs. performance

From: Terry Fritz <twfteslaatuswestdotnet>

Date: Sat, 23 Oct 1999 18:53:22 0600

Approved: twfteslaatuswestdotnet

DeliveredTo: fixupteslaatpupmandotcomatfixme

InReplyTo: <0.e8492a03.2543230eataoldotcom>
Hi All,
When one uses a pole transformer (220/14400 10kW) for charging a primary
cap, you can charge pretty large caps indeed (such as 180nF). This allows
one to operate a coil with a very low fundamental frequency (like 30kHz).
The lower frequencies have the advantage of using lower primary currents
and running very large secondary coils. I was wondering if there are any
draw back to those low frequencies? Perhaps there is an "optimal"
frequency one should design to?
I have been punching some of the numbers into MicroSim just to see what
goes on there. I could use a few numbers if anyone has them handy for
50amp variacs and pole transformers.
What is the DC resistance of a 50amp variac winding (the full end to end
resistance)? This predicts some of the voltage droop in operation.
What is the no load current draw of a variac with rated input voltage applied?
What is the DC resistance of the primary and secondary windings of a
"typical" pole pig?
What is the noload current draw of a pig at rated input voltage? I think
it is about 0.25 amp.
I don't have these parts handy so I thought I would ask around. These
values define some important model parameters for pigs and variacs.
Thanks!
Cheers,
Terry
terrellfatuswestdotnet