Article View: alt.engineering.electrical
Article #370Re: Electric Energy Economizer !!
From: Matthew Beasley
Date: Sun, 11 Jan 2004 07:06
Date: Sun, 11 Jan 2004 07:06
24 lines
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3537 bytes
"Keith R. Williams" <krw@attglobal.net> wrote in message . -snipped- > If the generator is producing 14kVA and the load consuming 10kW, > exactly where is the rest going? > I think you may be confusing that the generator's rating may be measured in kVA, but that doesn't mean how much POWER it is producing - or draws. If you measure the power input (mechanical) to the generator, it will increase only a small amount when adding VAR's. In your example if the generator is producing 10kW at unity power factor, lets say for discussion sake it takes 10.3kW to spin. Now lets add a 9.8kVAR load to the output to get to 14kVA. (BTW, since real and reactive currents are in quadniture, the VA is the root mean sum.) In this case, the input to the generator might raise to 10.4kW input. The small increase is due to the extra losses from the increasing current - but the input power doesn't increase to 14kW. Carrying VARs only increases the fuel consumption that the plant owner is paying for by a small amount. It's big impact is that often the generator is only able to carry full load at .85 or .9 PF. Any lower PF, and the output drops to keep from overheating the generator. 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: 10d137,5bf874aa96b72978 X-Google-Attributes: gid10d137,public X-Google-Thread: fd33a,5bf874aa96b72978 X-Google-Attributes: gidfd33a,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 23:06:15 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: <bt578b$3fofj$5@ID-174448.news.uni-berlin.de> <ipqJb.29$9k7.14451@news.xtra.co.nz> <wbtJb.20877$nK2.18044@nwrddc01.gnilink.net> <NBDJb.589770$0v4.23349050@bgtnsc04-news.ops.worldnet.att.net> <urpevv82k3r0trnb0jh762fs98hn2i8a6s@4ax.com> <3ff785d4@news.rivernet.com.au> <nt8fvv8pga4ir6caokf25nspfbhehp74dt@4ax.com> <CD_Jb.280057$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> <MPG.1a6a060664e7d63098aaa3@enews.newsguy.com> <slrnc00slc.213.isaac@latveria.castledoom.org> <MPG.1a6aa259ea57e90398aaaf@enews.newsguy.com> Subject: Re: Electric Energy Economizer !! Lines: 27 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: <GB6Mb.3635$1e.2645@newsread2.news.pas.earthlink.net> Date: Sun, 11 Jan 2004 07:06:14 GMT NNTP-Posting-Host: 63.190.33.246 X-Complaints-To: abuse@earthlink.net X-Trace: newsread2.news.pas.earthlink.net 1073804774 63.190.33.246 (Sat, 10 Jan 2004 23:06:14 PST) NNTP-Posting-Date: Sat, 10 Jan 2004 23:06:14 PST Organization: EarthLink Inc. -- http://www.EarthLink.net