Article View: sci.electronics
Article #22161Re: Watt Hour Meters
From: Michael McClary
Date: Fri, 02 Feb 1990 14:30
Date: Fri, 02 Feb 1990 14:30
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In article <1452@umigw.MIAMI.EDU> wb8foz@mthvax.cs.miami.edu (David Lesher) writes:
>
>One question I never asked a utility when I should have...
>
>Virtually everything causes inductive power factor problems. You
>correct for it (typically) with capacitors (some old-timers may call'em
>condensers, but I think those belong to steam engines and HVAC units :-}).
>
>What does the utility think if you offer to correct other people's
>leading PF by having too many farads?
They don't like that, either. Their resistive losses go with
I-squared-times-R, and generators and transformers are limited
by heat, and thus handle a maximum current, not a maximum power.
So utilities want as much of the current to be in-phase as can
be managed.
(By the way, idling synchronous motors can also "generate" VARs
{be capacitive}. Factories would just switch to all synchronous
motors if the utility paid for VAR generation.)
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Path: arc1-ca.pugleaf.net!utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!cs.utexas.edu!usc!apple!xanadu!michael From: michael@xanadu.com (Michael McClary) Newsgroups: sci.electronics Subject: Re: Watt Hour Meters Message-ID: <1990Feb2.143012.11352@xanadu.com> Date: 2 Feb 90 14:30:12 GMT References: <MARK.90Jan5105134@retix.retix.retix.com> <25675@cup.portal.com> <1262@island.uu.net> <1105@rsiatl.UUCP> <1452@umigw.MIAMI.EDU> Reply-To: michael@xanadu.UUCP (Michael McClary) Distribution: usa Organization: Xanadu Operating Company, Palo Alto, CA Lines: 20