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residential power meters M Q 01-10-2007
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Posted by M Q on January 10, 2007, 3:43 pm


Does anyone know whether residential power meters measure
real power or apparent power (vector sum of real and reactive power).

I have found claims for each on the web, so I am really only
interested if you can give a pointer to some authoritative
document such as a utilities commission decision, a statement
by a utility, or a spec for residential meters.


Posted by Charles Schuler on January 10, 2007, 4:24 pm



> Does anyone know whether residential power meters measure
> real power or apparent power (vector sum of real and reactive power).
>
> I have found claims for each on the web, so I am really only
> interested if you can give a pointer to some authoritative
> document such as a utilities commission decision, a statement
> by a utility, or a spec for residential meters.

They measure real power. You can Google for "electrodynamometer power
meters."



Posted by Tom The Great on January 10, 2007, 5:30 pm


wrote:

>Does anyone know whether residential power meters measure
>real power or apparent power (vector sum of real and reactive power).
>
>I have found claims for each on the web, so I am really only
>interested if you can give a pointer to some authoritative
>document such as a utilities commission decision, a statement
>by a utility, or a spec for residential meters.


I was told "Real Power" when I inquired, but looking at my electric
bill lately, I'm guessing "Assumed Power" or "Line Our Pockets Power"
:p
Just kidding. Real Power seems to be the response I get.

tom @ www.FreelancingProjects.com





Posted by Jeff Wisnia on January 10, 2007, 5:36 pm


M Q wrote:
> Does anyone know whether residential power meters measure
> real power or apparent power (vector sum of real and reactive power).
>
> I have found claims for each on the web, so I am really only
> interested if you can give a pointer to some authoritative
> document such as a utilities commission decision, a statement
> by a utility, or a spec for residential meters.
>

For the most part they measure real power at residences, but I've heard
tell of some areas in the southwestern USA where VAR metering is in use
for homes because of the heavy usage of air conditioning equipment.

Jeff

--
Jeffry Wisnia
(W1BSV + Brass Rat '57 EE)
The speed of light is 1.8*10^12 furlongs per fortnight.


Posted by krw on January 10, 2007, 9:46 pm


jwisnia@conversent.net says...
> M Q wrote:
> > Does anyone know whether residential power meters measure
> > real power or apparent power (vector sum of real and reactive power).
> >
> > I have found claims for each on the web, so I am really only
> > interested if you can give a pointer to some authoritative
> > document such as a utilities commission decision, a statement
> > by a utility, or a spec for residential meters.
> >
>
> For the most part they measure real power at residences, but I've heard
> tell of some areas in the southwestern USA where VAR metering is in use
> for homes because of the heavy usage of air conditioning equipment.

Why would AC screw up the PF? A loaded motor will have a PF pretty
close to unity.

--
Keith

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