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Subject Author Date
residential power meters M Q 01-10-2007
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Posted by Jeff Wisnia on January 11, 2007, 1:42 am


krw wrote:

> 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.
>

If that were always the case, then why would so many industrial
operations invest in power factor correction systems?

Jeff

--
Jeffry Wisnia
(W1BSV + Brass Rat '57 EE)
The speed of light is 1.98*10^14 fathoms per fortnight.

AppliancePartsPros.com, Inc.
Posted by krw on January 11, 2007, 9:47 am


jwisnia@conversent.net says...
> krw wrote:
>
> > 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.
> >
>
> If that were always the case, then why would so many industrial
> operations invest in power factor correction systems?
>
Because they have a lot of strange things like fluorescent lights?
Computers?

--
Keith

Posted by Everett M. Greene on January 11, 2007, 12:23 pm


> krw wrote:
> > 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.
>
> If that were always the case, then why would so many industrial
> operations invest in power factor correction systems?

Large industrial customers have the PF monitored and there's
a substantial surcharge for the PF being too low. Electrical
devices intended for home and commercial use are required to
have PF correction built into them. All bets are off with
industrial devices.

Posted by Pop` on January 10, 2007, 7:32 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.

Go to your power co's web site; they'll explain it there and some even have
dissertations on power factor, etc., even though it's for residential
meters. I know mine does.

Pop`



Posted by HeyBub on January 10, 2007, 9:01 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.

A KWH meter?

They used to measure resistive load only.

That meant an appropriate capacitance across a reactive load (such as an AC
compressor) could nullify the measured load. Still that way in most cases.



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