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Re: [TCML] Variable Ballast



Jon,
The modern cheap import ones you see knocking about are generally not up to the job for a pole pig, without getting pretty hot during use. I melted and shorted the windings of one a while back while running @ 10.5kv / 400mA - (hardly pig output) simply because I left it running for several minutes (they normally have a thermal cutout to disconnect the mains input during normal use)
Their duty cycle is very low sometimes, especially as Yurtle mentions, if Alu' conductor is used; also the resulting voltage drop from lossy windings gets multiplied up by the pig, so you could potentially be losing 0.5kv at the worst case.
Winding your own ballast is a better option.


Regards
Phil Tuck

www.hvtesla.com



-----Original Message-----
From: Tesla [mailto:tesla-bounces@xxxxxxxxxx] On Behalf Of Yurtle Turtle via Tesla
Sent: 30 July 2015 20:52
To: GENE GARRAGE; Tesla Coil Mailing List; Tesla Coil Mailing List
Subject: Re: [TCML] Variable Ballast

I got a 225 amp Lincoln welder at a garage sale.It was old enough to have copper windings. I chose to short the welding leads internally, and eliminate the cables.

      From: GENE GARRAGE via Tesla <tesla@xxxxxxxxxx>
 To: Tesla Coil Mailing List <tesla@xxxxxxxxxx> 
 Sent: Wednesday, July 29, 2015 6:53 PM
 Subject: Re: [TCML] Variable Ballast
   

      From: Jon Danniken <danniken@xxxxxxxxxxx>
 To: Tesla Coil Mailing List <tesla@xxxxxxxxxx> 
 Sent: Thursday, July 2, 2015 2:28 PM
 Subject: Re: [TCML] Variable Ballast
  
On 07/01/2015 11:14 AM, Miles Mauldin wrote:
> Do I need to find an old welder, or will an inexpensive new one work
> just as well. Read many posts about shorting the secondary and using
> the primary in line with a pole pig. Thoughts, ideas or suggestions
> all wanted for a variable ballast.

You can get an old 220V arc welder for cheap on craigslist if you are
patient,  less cheap if you are not patient.  As a bonus, you also get a
welder.

Jon
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