I read in !emc-pstc that Rich Nute <ri...@sdd.hp.com> wrote (in <200301291623.iaa07...@epgc264.sdd.hp.com>) about 'Unity Power Factor' on Wed, 29 Jan 2003: > > > >Hi John: > > >> >In the USA, this has largely been fixed by a change in >> >the USA National Electrical Code. >> >> There must be quite a number of installations that are not yet upgraded. > >Where a problem existed, it was fixed by pulling >another neutral.
Yes, we do that, too. > >> Are there any other problems appearing in the field which can be >> reliably determined as due to concentrations of non-linear loads of less >> than 3 kVA or so? > >Probably not. > >The only other problem that I know of is distribution >transformer overheating. But, I believe such >transformers are very much larger than 3 kVA, so 3 kVA >of non-linear loads would have very little effect. > I mean *concentrations* of loads, individually below 3 kVA or so. Distribution transformer overheating is the sort of effect that I am interested in. Are these MV/LV transformers, 'pole-pig' types or larger. -- Regards, John Woodgate, OOO - Own Opinions Only. http://www.jmwa.demon.co.uk Interested in professional sound reinforcement and distribution? Then go to http://www.isce.org.uk PLEASE do NOT copy news posts to me by E-MAIL! This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Ron Pickard: emc-p...@hypercom.com Dave Heald: davehe...@attbi.com For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org Archive is being moved, we will announce when it is back on-line. All emc-pstc postings are archived and searchable on the web at: http://www.ieeecommunities.org/emc-pstc
