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'Power Factor Correction[OT]'
1999\11\22@061011 by

On Sat, 20 Nov 1999, Wagner Lipnharski wrote:

>
> Question:  Why should a meter take current *AND* voltage to calculate my
> house's power consume?  Reading just current should be enough, since
> voltage is a known element and by this way they can avoid problems with
> power factor messing with their measurement...

Exactly that's why they do calculate kW and not KVA and this "magnetic
multiplier" measures V * A * power factor. If one corrects the power
factor e. g. with capacitive loading, then the current may decrease in the
appropriate way, and "unter dem Strich" (I do not know how to say it in
English: below the line ???)  there is no difference. Believe
me, I have tried and measured it.

And to the comment of backward rotation mentioned by Paul: unfortunately,
all of our power meters are applied with a ratchet, so backward rotation
is blocked.

Regards,
Imre

Dr. Imre Bartfai wrote:

> And to the comment of backward rotation mentioned by Paul:
> unfortunately, all of our power meters are applied with a ratchet, so
> backward rotation is blocked.

That would strongly make you suspect the proposal to be true, wouldn't
it?
--
Cheers,
Paul B.

"Dr. Imre Bartfai" wrote:

> Exactly that's why they do calculate kW and not KVA and this "magnetic
> multiplier" measures V * A * power factor. If one corrects the power
> factor e. g. with capacitive loading, then the current may decrease in the
> appropriate way, and "unter dem Strich" (I do not know how to say it in
> English: below the line ???)............. snip ...........
>
> Regards,
> Imre
=======================

Imre

We would say "the bottom line", as in "the bottom line is that there is
no difference." Reference is to the bottom line summary on a page of
figures.

Harley L. Miller     hmillersound.net

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