Re: 15kVA 12.6kV pole pig (fwd)

["Tesla list" <tesla@xxxxxxxxxx>]

---------- Forwarded message ----------
Date: Tue, 19 Jun 2007 17:44:07 +0000
From: David Rieben <drieben@xxxxxxxxxxx>
To: Tesla list <tesla@xxxxxxxxxx>
Cc: drieben@xxxxxxxxxxx
Subject: Re: 15kVA  12.6kV pole pig (fwd)

Hi Tim,

You can series two 1156 variacs and run them at 240 volts input
at the same 50 amps. 1256 variacs are just like 1156 units except
that each 1256 variac is rated at 240 volts input instead of 120 volts
like an 1156. From what I can tell by looking closely at these 1156/
1256 series Powerstats  they are basically identical. They ap-
pear to be wound with 2 parallel coils of wire around the core. In
the 120 volt rated 1156, the 2 coils are paralleled and in a 1256, the
2 coils are seriesed.

David Rieben

-------------- Original message -------------- 
From: "Tesla list" <tesla@xxxxxxxxxx> 

> 
> ---------- Forwarded message ---------- 
> Date: Tue, 19 Jun 2007 04:59:26 -0400 
> From: timjroche@xxxxxxx 
> To: tesla@xxxxxxxxxx 
> Subject: Re: 15kVA 12.6kV pole pig (fwd) 
> 
> 
> 
> I spent the past two days searching the archives (I'm sure I didn't 
> scratch the surface) and from what I gather to cut a core or not to is 
> based on availability to you of big variacs and like always personal 
> experience and personal design of TC. I acquired a 3 stack of variacs that 
> are 8" diameter and wound with 12 AWG. they were NOS, I took them out of 
> there original box. unfortunately the model # is so old that there is no 
> info on the web. the name plate is blank. I had 2 different electronic 
> stores try to cross ref with no results. so I am using them as a 
> adjustable ballast on the 15kVAÂ pole pig now instead of the original 
> setup I had which is a 1156D. there is a surplus store near me going out 
> of business and giving away 1156D variacs for $150. CHEAP. 1156D's are 
> rated 10kVA at 120 VAC. my question is, from my understanding, usually the 
> wire gage determines current. what makes a variac voltage limits? the 
> inductance? so that when mains voltage is put across it, it does not see 
> it as a short? is using two 1156Ds stacked for voltage control with 220 
> VAC RMS mains not a good idea? variacs are built to run at name plate 
> current but what about voltage? I have only one other experience with over 
> voltage of a variac. it was a small 120 VAC 3 Amp and when I put 220 
> across it, it would blow the breaker. but 1156D are one of the biggest on 
> market. anyone have any thoughts??? 
> 
> 
> -----Original Message----- 
> From: Tesla list 
> To: tesla@xxxxxxxxxx 
> Sent: Sat, 16 Jun 2007 8:37 am 
> Subject: Re: 15kVA 12.6kV pole pig (fwd) 
> 
> 
>