RE: 10kva pole pig needed with 29kv primary

["Tesla list" <tesla@xxxxxxxxxx>]

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

Hi BunnyKiller, how's the hunting...

Thanks, yes the current voltage trade makes clear sense. Say what kind of
caps do you use? My three phase will be 24,000 DC but the .707 thing is not
an issure like with 30KV/.707= 42,433vlots yes? You gotta be using the
Maxwell Super Caps. What is their series number btw. I have a copy of the
junk ones... wanna explode em?

Thanks, Jim Mora


-----Original Message-----
From: Tesla list [mailto:tesla@xxxxxxxxxx]
Sent: Thursday, October 19, 2006 8:18 AM
To: tesla@xxxxxxxxxx
Subject: Re: 10kva pole pig needed with 29kv primary

Original poster: BunnyKiller <bunnikillr@xxxxxxx>

looks like Bellsouth doesnt like alot of  traffic....   thats why I
dropped them and went to Cox Cable...  but anyway..

yes I seriesed  2 14.4KV piggies for 28.8 KV and when driven by the
variacs can obtain a little over 30KV  but at 10KVA ( both piggies
are rated for 10KVA)

when seriesed transformers are applied ( considering both are equally
made) you get additive voltage but the amperage remains equal.  If
paralleled, you get the opposite...  same voltage but additive amperage.

If one plans on placing two piggies in series, you NEED to triple
insulate the trannies from the case very well...  seems that the
clearances from the case walls and the trannies is minimal for the
original voltage set.  Dont throw away any of the "paper" insulative
material found in the case and consider procuring even more, you will
need as much as you can use.  Pay attention to the way the trannies
are originally set up when you open the case... draw a schematic of
how it was connected. Also another thing to watch for is the
"polarity" of the transformers output, its the same as in NST or MOT
applications when going series.

as far as connections, I paralled the "primary" ( input) side of the
coil and seriesed the "secondary" ( output) side.

Even tho I have a bundle of insulation in my piggie, at the higher
input voltages ( when the output is getting into the 29KV plus) you
can hear "corona sizzle" in the case. I also ground the case to a
dedicated ground rod just in case something breaks down....

Scot D




Tesla list wrote:

>Original poster: "David Rieben" <drieben@xxxxxxxxxxxxxxx>
>
>Hi Jim,
>
>Yes, you could do exactly that ;^) Or, if you have at least
>one of the pig trannies with 2 HV bushings, or "horns", you
>could "float" one at 14,400 volts and "piggy-back" it on the
>other one's output for additive voltage. Of course, you'd
>at least want the pig that's floating at 14.4 kV to be a 2 HV
>bushinged unit, as the outer tank of a pig floating at 14.4 kV,
>relative to ground, would be an electrocution waiting to hap-
>pen ;^0 The pigs' BIL rating should allow for piggy-backing
>of the HV output of one pig on another, though. I think Scot
>"Bunnykiller" Dingman uses 2 seriesed 14.4 kV pigs for up
>to ~30 kV input for his big coil's primary circuit. He discusses
>this on his website. http://bellsouthpwp.net/B/u/BunnyKiller/bigpig.html
>
>David Rieben
>