Re: [TCML] Variac Overrating (1256's and others)

[sparktron01@xxxxxxxxxxx]

Jim 

Phoenix Technologies makes a Variac on steroids called a Tahoma 
Regulator, secondary rotates around magnetic path and carbon 
wipers make sliding contact...under oil. Our company has a client 
that just installed a 3MW regulator under digital control. 

http://www.phenixtech.com/BP58a.asp 

THVT unit is installed in standard transformer can (1 phase units) 
3 assembled on channel base plate. 13.8kV in, 0-1.7kV 3 phase 
out. Better have deep pockets to get one for your lab though 
(about $1,000,000 US). There were teething "issues" with this 
unit OBTW, . 

Regards 
Dave Sharpe, TCBOR/HEAS 
Chesterfield, VA. USA 

----- Original Message ----- 
From: "jimlux" <jimlux@xxxxxxxxxxxxx> 
To: "Tesla Coil Mailing List" <tesla@xxxxxxxxxx> 
Sent: Tuesday, June 2, 2009 10:19:41 AM GMT -05:00 US/Canada Eastern 
Subject: Re: [TCML] Variac Overrating (1256's and others) 

brianb@xxxxxxxxxx wrote: 
> Jim/all, 
> 
> Attached is a link to the official word on how much you can push a variac (direct from the 
> manafacturer). 
> 
> http://www.brianb.org/Download%20Files/staco_Overload_graph.jpg 
> 
> As you can see they will easily do 250% for a 5-min run with a 30-min cool-down between runs (this 
> assumes the brushes and contact surfaces are in good shape)... 
> 
> Hope this helps. 
> Regards, 
> 
> Brian B. (back to lurking) 
> 

And, if you were to provide forced air cooling, or immerse the thing in 
oil, you could probably do more. (not sure how well the wiper brushes 
work under oil, but I'll bet they'd work ok) 
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