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"
Just kidding. Real Power seems to be the response I get.
tom @ www.FreelancingProjects.com
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.
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
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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