Re: [TCML] Ballast Question

[drieben@xxxxxxxxxxx (David Rieben)]

Hi Garry,

No, I don't see any problem with doing this but my
question is why do you need the extra 240-480 step
transformer in the circuit, unless the low voltage side
of your pig happens to be 480 volts rated instead of 240.?
480volts plus the boost from the variac would yield on
the order of 550 to 600 volts into the low voltage
side of the pig and if it is only rated at 240 volts,
this would severely overvolt and saturate the core
of the pig. Also, if it actually is rated at 480 volts
across its low voltage side, you could just use the 
center tap of the three low voltage bushings for a
240 volt rated input tap. It does have 3 LV bushings,
doesn't it? I have seen 2 LV bushings on pigs that
are designed to be a single pig in a 3-pig, 3-phase
bank to provide a phase of 277/480Y, 3-phase 
service, but these are generally larger transformers
(25 kVA or greater rated units).

--
David Rieben

-------------- Original message -------------- 
From: "garry neeley" <bamacoiler@xxxxxxxxx> 

> Hey guys I just have a quick question here. In my setup I'm gonna take 240 
> from the wall to a -280 v out variac to a-240 to 480 step up xformer to the 
> -ballast to the -pig. Do you guys think there will be any problems with 
> this because I have the extra step up transformer in the circuit? Any 
> thoughts, ideas? 
> Bamacoiler 
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