Bino,
I know you are smarter than I am. But, your share of, (...*but they
definitely do charge industrial customers for VA since they probably
would have low PF otherwise.. ) while true is useless.*
*Are you doing something local behind you own apt's wattmeter; or, are
you trying to do a commercial project for somebody else? KVA is a
commercial measurement per Greg's last share.
In your apartment, you live in a KiloWatt/hour world (per your
supplier's installed WattMeter).
Your share is very confusing. Why is Power Factor so important to you ATM?*
*Best,
Duncan*
On 08/01/2011 13:12, Bino Gopal wrote:
Well the confusion is that the utility *could* charge you for VA instead of
watts, but apparently they don't for residential customers (since most
residences only have older-style meters that read only watts) but they
definitely do charge industrial customers for VA since they probably would have
low PF otherwise...ahh, from the PF wikipedia article:-Importance of power
factor in distribution systems-The significance of power factor lies in the
fact that utility companies supply customers with volt-amperes, but bill them
for watts. Power factors below 1.0 require a utility to generate more than the
minimum volt-amperes necessary to supply the real power (watts). This increases
generation and transmission costs. For example, if the load power factor were
as low as 0.7, the apparent power would be 1.4 times the real power used by the
load. Line current in the circuit would also be 1.4 times the current required
at 1.0 power factor, so the losses in the circuit would be doubled (since they
are proportional to the square of the current). Alternatively all components of
the system such as generators, conductors, transformers, and switchgear would
be increased in size (and cost) to carry the extra current.-Utilities typically
charge additional costs to customers who have a power factor below some limit,
which is typically 0.9 to 0.95. Engineers are often interested in the power
factor of a load as one of the factors that affect the efficiency of power
transmission.
-And I read somewhere (can't find the link now; it was one of like 30 I was
reading yesterday before I read this one that clearly states that utilities
charge for watts, not VA ) that some utilities are installing meters than can
read VA instead, since they have to pay to push VA and not watts...which
actually makes sense to me.-
BINO-> Date: Mon, 1 Aug 2011 05:55:00 -0400
From: [email protected]
To: [email protected]
Subject: Re: [H] PFC (power factor corrected) PS for PCs?
What's the confusion? You're paying for watts....you don't pay for
VA..that's a unit used for complex power, part if which includes
reactive power, which is not converted to useful work. Real power is,
which is measured in watts.
On 8/1/2011 5:29 AM, Bino Gopal wrote:
Lol that's exactly one of the links I found (among about the 20 or so I've been
perusing all day), but it still isn't clear to me from any of them whether I'm
paying for VA or watts...anyone know for sure or does it depend on your
particular power company and the kind of meters they use maybe...?
> Date: Mon, 1 Aug 2011 00:12:50 -0700
From: [email protected]
To: [email protected]
Subject: Re: [H] PFC (power factor corrected) PS for PCs?
"Capacitor Input supplies have the characteristic that the Watt rating is in
the range of .55 to .75 times the VA rating (power factor of 0.55 to 0.75)."
http://www.power-solutions.com/watts-va.php
On Jul 31, 2011 11:50 PM, "Bino Gopal"<[email protected]> wrote:
