Article View: alt.engineering.electrical
Article #369Re: Electric Energy Economizer !!
From: Matthew Beasley
Date: Sun, 11 Jan 2004 06:48
Date: Sun, 11 Jan 2004 06:48
48 lines
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3648 bytes
"Charles Perry" <pipesandtobacco@hotmail.com> wrote in message news:btqhh0$a8nlm$1@ID-103962.news.uni-berlin.de... > > "Repeating Rifle" <SalmonEgg@sbcglobal.net> wrote in message > news:BC2608A6.555B%SalmonEgg@sbcglobal.net... > > in article dpf10098qiikro71ksdb1m09g675fg5134@4ax.com, Peter Dettmann at > > peter@aardvark.net.au wrote on 1/10/04 7:23 PM: > > > > > measure 'reactive power', which is badly named anyway. > > > > This is not so badly named. It represents true power transfer, although is > > not net power transfer. It is tranfered to the customer and back to the > > source at double the line frequency. > > > > Bill > > > > Excuse me? "double the frequency"? > > Charles Perry P.E. > > For SINGLE phase, the power flow reverses at twice line frequency. Assume a circuit of an AC generator connected to an ideal capacitor, with the circuit in equilibrium. Start at the positive going zero line crossing. From this point until the line crest, the capacitor will charge. Energy flow : Generator ----> Capacitor From the crest until the negative going zero crossing the current reverses, energy flow: Capacitor ----> Generator From the negative going zero crossing, the current will remain the same but the sign of the voltage reversed. Energy flow: Generator ----> Capacitor From the negative crest until the positive going zero crossing, the current will reverse. Energy flow: Capacitor -----> Generator For one cycle of the line the energy flow reverses twice, hence, twice the frequency. Matthew
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X-Google-Language: ENGLISH,ASCII-7-bit X-Google-Thread: 109f9b,5bf874aa96b72978 X-Google-Attributes: gid109f9b,public X-Google-Thread: fd33a,5bf874aa96b72978 X-Google-Attributes: gidfd33a,public X-Google-Thread: 10d137,5bf874aa96b72978 X-Google-Attributes: gid10d137,public X-Google-Thread: 103407,5bf874aa96b72978 X-Google-Attributes: gid103407,public X-Google-Thread: fafc9,5bf874aa96b72978 X-Google-Attributes: gidfafc9,public X-Google-ArrivalTime: 2004-01-10 22:48:15 PST Path: arc1-ca.pugleaf.net!archiver1.google.com!news2.google.com!news.maxwell.syr.edu!elnk-pas-nf1!newsfeed.earthlink.net!stamper.news.pas.earthlink.net!newsread2.news.pas.earthlink.net.POSTED!ad798d4c!not-for-mail From: "Matthew Beasley" <beasleys@teleport.com> Newsgroups: alt.engineering.electrical,aus.electronics,misc.industry.utilities.electric,sci.engr.electrical.compliance,sci.engr.electrical.sys-protection References: <3ff785d4@news.rivernet.com.au> <nt8fvv8pga4ir6caokf25nspfbhehp74dt@4ax.com> <CD_Jb.280057$Ec1.9613771@bgtnsc05-news.ops.worldnet.att.net> <bt9vr6$4tmu9$1@ID-103962.news.uni-berlin.de> <yo0Kb.597415$0v4.23524771@bgtnsc04-news.ops.worldnet.att.net> <oj4v+tAOlR+$EwCo@jmwa.demon.co.uk> <MPG.1a63df869880ac1998aa6b@enews.newsguy.com> <L3NnrQAYJl+$EwGZ@jmwa.demon.co.uk> <MPG.1a669adeab3c983498aa8d@enews.newsguy.com> <3fffee5b@news.rivernet.com.au> <dpf10098qiikro71ksdb1m09g675fg5134@4ax.com> <BC2608A6.555B%SalmonEgg@sbcglobal.net> <btqhh0$a8nlm$1@ID-103962.news.uni-berlin.de> Subject: Re: Electric Energy Economizer !! Lines: 50 X-Priority: 3 X-MSMail-Priority: Normal X-Newsreader: Microsoft Outlook Express 6.00.2800.1158 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1165 Message-ID: <Nk6Mb.3553$1e.563@newsread2.news.pas.earthlink.net> Date: Sun, 11 Jan 2004 06:48:13 GMT NNTP-Posting-Host: 63.190.33.246 X-Complaints-To: abuse@earthlink.net X-Trace: newsread2.news.pas.earthlink.net 1073803693 63.190.33.246 (Sat, 10 Jan 2004 22:48:13 PST) NNTP-Posting-Date: Sat, 10 Jan 2004 22:48:13 PST Organization: EarthLink Inc. -- http://www.EarthLink.net