Re: [TCML] 120 VAC 10 KVA Reactive Primary Amperage Consumptions

[David Sharpe <sparktron01@xxxxxxxxx>]

Since I am working in the power/utility engineering arena now, and one
of our clients builds substation transformers up to 100MVA(+);
I'll ask a few contacts concerning power draw at these power levels.
Be aware, a 115kV to 4.16kV three phase transformer will have a
"slightly"
different (yea right) impedance envelope then a pole pig.  Unloaded
burdens on transformers, if the magnetic path has little leakage will
generally
be less then 5% of FLA, and I've seen values on small transformers
below 1% with a well designed unit.


On Wed, Apr 21, 2010 at 8:02 PM, Harvey Norris <harvich@xxxxxxxxx> wrote:
> I was quite surprised to find that my 10 KVA Pole pig only consumes 0.1 A with no secondary load from wall voltage. This is in contrast to other higher voltage transformers at hand for testing where an 80 lb one with an unknown KVA rating consumed 1.22 A in comparison to the 1 KVA one tested at .55 A. Another electrical engineer expressed the opinion that, the bigger the KVA rating, the more reactive it appears, thus less amperage and not more will appear on a measurement of its reactive amperage alone. Thus it appears that I am totally wrong in this assumption I have made.
> HDN
>
>
>
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-- 
Dave Sharpe, TCBOR/HEAS
Chesterfield, VA USA

Sharpe's Axiom of Murphy's Law
"Physics trumps opinion!"
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