Re: 15kVA 12.6kV pole pig (fwd)

["Tesla list" <tesla@xxxxxxxxxx>]

---------- Forwarded message ----------
Date: Sat, 16 Jun 2007 10:50:12 -0500
From: Bert Hickman <bert.hickman@xxxxxxxxxx>
To: Tesla list <tesla@xxxxxxxxxx>
Subject: Re: 15kVA  12.6kV pole pig (fwd)

Doh...

Now I see (in the header!) that your pig's output voltage is 12.6 kV. 
and not 14.4 kV. This blows away about half of my previous post... :^)

With this output and ballast setting, you should be operating in STR 
mode (good!). However, you are still saturating your variac ballast when 
the gap fires. To prevent this, you'll either need to cut the core of 
your ballast variac(s), or use an external current limiting ballast that 
does not saturate under the stiffer loading presented by your pig.

Sorry for the "senior moment",

Bert
-- 
***************************************************
We specialize in UNIQUE items! Coins shrunk by huge
magnetic fields, Lichtenberg Figures (our "Captured
Lightning") and out of print technical Books. Visit
Stoneridge Engineering at http://www.teslamania.com
***************************************************




Tesla list wrote:
> ---------- Forwarded message ----------
> Date: Sat, 16 Jun 2007 10:28:24 -0400
> From: timjroche@xxxxxxx
> To: tesla@xxxxxxxxxx
> Subject: Re: 15kVA  12.6kV pole pig (fwd)
> 
> 
> david,
> 
> 
>    yes, i am sorry, it is Tim, thank you. according to the factory
> nameplate, it is a 120/240 LV. FYI - HV has a 5 position switch for
> incramental voltages from 12,600 down to 10,500 VAC.
> 
> -----Original Message-----
> From: Tesla list <tesla@xxxxxxxxxx>
> To: tesla@xxxxxxxxxx
> Sent: Sat, 16 Jun 2007 6:40 am
> Subject: Re: 15kVA 12.6kV pole pig (fwd)
> 
> 
> 
> 
> 
> --------- Forwarded message ----------
> ate: Sat, 16 Jun 2007 14:08:31 +0000
> rom: David Rieben <drieben@xxxxxxxxxxx>
> o: Tesla list <tesla@xxxxxxxxxx>
> c: drieben@xxxxxxxxxxx
> ubject: Re: 15kVA  12.6kV pole pig (fwd)
> Hi , is it Tim?
> Are you sure that your newly aquired pole transformer isn't rated for 240/
> 80 on its low voltage terminals instead of 120/240 since you are getting
> etter performance by center tapping the LV terminals?
> 
> avid Rieben
> -------------- Original message -------------- 
> rom: "Tesla list" <tesla@xxxxxxxxxx> 
>  ---------- Forwarded message ---------- 
>  Date: Sat, 16 Jun 2007 01:57:34 -0400 
>  From: timjroche@xxxxxxx 
>  To: tesla@xxxxxxxxxx 
>  Subject: 15kVA 12.6kV pole pig 
>  
>  i have recently went from two Westinghouse PT's (about 5kVA) to a 15kVA 
>  pole XFR. Holy Squirrelly!! i am running SRSG 3600 RPM 4flying (.5" 
>  tung.)/2 station (.5" german silver). 0.1 uf hipotronics 70kV RMS tank 
>  cap. 
>  
>  my biggest issue, besides the obvious current limiting, is getting the gap 
>  to quench. went to 8 pole flying and basically made a jacobs ladder around 
>  the rotor. like no quench at all. so back to 4 flying. am i way off or is 
>  this a impedance problem on the LV side of pole XFR? BTW - i get nothing 
>  but 60 cycle hum or saturation using 220 VAC RMS across the LV windings. 
>  yet if i hook up my 220 VAC RMS with one leg on the CT or hooking it up 
>  like 110 VAC RMS, i get much better performance. for those interested, i 
>  was using a 1256 variac as voltage control and a 1156D as phase ajustment. 
>  Now i have put a 3-stack 60 amp inline current limit. i first put 220 
>  across it and turned the wipers till i was pulling 40 amp. then put it in 
>  series. it is still only a 3 to 4 foot streamer. with my PT's, i can get 2 
>  -3 streamers 6 to 7 foot long. 
>  
>  Thoughts? 
>  Suggestings? 
>  Ideas? 
>  ________________________________________________________________________ 
>  AOL now offers free email to everyone. Find out more about what's free from 
> OL 
>  at AOL.com. 
>  
>  
> 
> 
> 
> ________________________________________________________________________
> AOL now offers free email to everyone.  Find out more about what's free from AOL at AOL.com.
> 
> 
>