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From: "Al Hephy"
Subject: Re: Microwave oven from 110V to 220V
Date: Sat, 12 Oct 2002 09:03:10 -0400
Organization: Posted via Supernews, http://www.supernews.com
Reply-To: "Al Hephy"
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Don't fight guys... Those 'power meters' actually measure current. =20
During "brownouts" the power company screws you royally.
Chuck Simmons wrote in message =
> Sam Goldwasser wrote:
> > Chuck Simmons writes:
> > > You miss my point. The old Ferraris type electromechanical =
> > > meter is unaffected by power factor. In at least 40 years I have =
> > > other type. Even new installations use the Ferraris type because =
> > > indicate true power economically. If there is a PF penalty to be
> > > applied, the Ferraris meter reads correct power and a KVA meter is =
> > > to determine the penalty. In residential areas of the US that have =
> > > power factor due to air conditioning and the like, the utility =
> > > capacitor banks for correction. The Ferraris meters read the same =
> > > way. I suspect that you have to go back more than 50 years to find =
> > > kilowatt hour meter that is affected by power factor in use by US
> > > utilities.
> > I guess I am missing your point because as far as I can tell, we =
> > everything. All I am saying is that these power meters do not =
> > power by some accident (violation of Murphy's law!), they were =
> > work that way. It's very clever and as you say, economical. If a =
> > minted EE were asked to design a modern replacement, it would likely =
> > voltage and current sensing, analog to digital conversion, a =
> > to calculate power, and end up not being as accurate!
> Very sorry. Several times in these groups I have seen statements to =
> effect that kilowatt hour meters of traditional type do not indicate
> true power but rather apparent power such as you would get with a
> voltmeter and an ammeter. I incorrectly attributed this to you. You =
> it right all along correcting some reference to a more rapidly =
> meter or some such. I should read more carefully early in the morning.
> And indeed the Ferraris type meter is very clever being an integrating
> true power meter of very simple construction. One of its virtues in =
> power systems is that it is reversible - that is, it "knows" which
> direction power is going.
> ... The times have been,=20
> That, when the brains were out,=20
> the man would die. ... Macbeth=20
> Chuck Simmons firstname.lastname@example.org
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