On Wed, 2011-03-09 at 23:51 -0600, Jon Elson wrote: > Peter Blodow wrote: > > > > I think it would be worth wile to build up a powerful lobby in the US to > > enforce decent power supply for everyone - what a shame for the most > > powerful and most technically oriented country in the world to discuss > > about how to get motors and machines running! > The infrastructure changes that would be required are beyond belief. > For instance, there is 3 phase > 7200 V power half a block away from me, but there is only one phase 7200 > V main running down > my street, and it runs for at least half a mile down the major street, > then branches into the side streets. > So, all those houses and streets have ONLY single-phase high tension. I > can think of areas I've been > where the high tension single phase feed goes for literally many miles > down rural roads. > > In cities, there is often 3-phase high tension feeders near to every > house, but even still, there is a HUGE > amount of infrastructure that would have to be changed. > > So, poles would need to be replaced or at least have cross-arms added, > all residential transformers in the country > would have to be replaced, all service lead-ins would have to be changed > from 3-wire to 4-wire, all > residential meters would have to be replaced, all circuit breaker panels > would have to be replaced. > Then, you have to figure eventually replacing all major loads such as > ovens, clothes dryers and > air conditioners with 3-phase. > > My house has its own, personal 50 KVA transformer. We have 200 A 240 V > service, so that > is 48 KVA. Can you imaging the industry that would have to develop to > replace EVERY residential > transformer in the WHOLE country? > > Few homes have any 3-phase loads unless they have serious home shops, so > really the need for 3-phase > power is not that big a problem, especially now that VFDs are available. > > > Jon
I find it interesting that you have a 50 KVA transformer for your house, I had the same thing growing up at Coulee. Dad said that if we turned on everything in the house we could actually draw the whole 50 KVA. 'course at that time we were probably paying less than 5 mils/KWH. Everything was electric; oh duh! Dave > > ------------------------------------------------------------------------------ > Colocation vs. Managed Hosting > A question and answer guide to determining the best fit > for your organization - today and in the future. > http://p.sf.net/sfu/internap-sfd2d > _______________________________________________ > Emc-users mailing list > [email protected] > https://lists.sourceforge.net/lists/listinfo/emc-users ------------------------------------------------------------------------------ Colocation vs. Managed Hosting A question and answer guide to determining the best fit for your organization - today and in the future. http://p.sf.net/sfu/internap-sfd2d _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
