[TCML] 1KVA Pole Pigs?
resonance at wildblue.net
Mon Nov 24 22:38:32 MST 2008
If it is not in a tank of oil and potted in epoxy, then it's probably a
potential transformer (commonly called a PT). I've seen oil filled pole
xmfrs rated at 3 kVA but never heard of a 1 or 1.5.
You definitely need a protective filter on the HV side of these (and pole)
xmfrs. Lack of this filter is probably why your one xmfr failed.
Most PTs rated 1.5 kVA can be run in the 3-4 kVA range, but always use a
protect filter, never run them bare.
On Mon, Nov 24, 2008 at 7:55 PM, <ConorPerry at comcast.net> wrote:
> I was looking at a large coil (24" secondary) tonight which uses two 7200
> volt pole pigs in series. The tags showed "1.0 KVA" and "1 KVA" on the
> other at 7200. One had a weight listed of 88 pounds. I've previously
> measured these transformers pulling 20amps each (120 each feed from two legs
> and neutral of a 208 3-phase system). Now running them phase shifted
> doesn't seem like a good idea, but I have no science to backup why I think
> My question is, "1 KVA" really? I didn't think they made pigs that small.
> How did they survive at all running nearly 2.5 times their rating? One is
> now dead with a shorted secondary. Looks like it will be hard to find
> another to matchup this pair again.
> One pig is labeled "Fixed Load Transformer", what does that mean?
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