| Solar Flare 2006-01-24, 9:21 pm |
| The correct and legal meter has to have two potential
coils to measure each leg accurately. This means the
meter base has to have a 5th jaw added to it from the
four jaw single phase version.
The meter will have to say "network" or 3 phase 3 wire
on the front.
Conversions have been missed where I am from, and
caught years later. The utility loses in any case. If
you are the utility then you could be out money. 25% of
the unbalnced load. This usually doesn't amount to too
much.
The distributions panel (load centre) is the same unit,
single phase or three phase 120 degree voltages.
Two sure fire methods to tell are measure the three
voltages and see if they add up linearly or at 0.866 =
cos 30deg. The other method is to use a Knopp or other
brand phase sequence indicator on the three wires. If
it turns, there is phase displacement. If still, inline
180 degrees.
"RF Dude" <post@thisnewsgroup.com> wrote in message
news:SeyBf.15003$ve.265911@news20.bellglobal.com...
> Thats very interesting and I'm glad you pointed out
the measurement error
> with a 2 phase unbalanced load. So what would be the
solution for measuring
> the 2 phase (120 degree) neutral imbalance correctly?
A three phase meter
> would be one answer, or could the newest ELECTRONIC
single phase meters
> react correctly?
>
> I ask this cause it isn't that uncommon to have
certain "2 phase" tenant
> loads using single phase 120/240V load panels in a
commercial 3 phase
> building. Telecom and cellular tenants come to mind.
The check meter to pay
> the landlord back is usually single phase, which in
your explaination would
> short change the landlord.
>
> RF Dude
>
> "Solar Flare" <sfl@hutmail.notvalid> wrote in message
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