On 11/23/2010 9:23 AM, Andy Pugh wrote: > On 23 November 2010 14:06, John Kasunich<jmkasun...@fastmail.fm> wrote: > > >>> My next project is a remote off grid 60 HZ power unit. >>> >> I think this has nothing to do with transitions to/from utility >> power. >> > Ah, in that case, why does it matter? > >
Not sure. Generally when generators take over after a power outage they don't try and maintain sync with the utility since the utility has no power on the lines to synch with. When the power comes back up, the generator speed is synced to the line and the transfer is made back to the utility. I remember back in college that we had a lab experiment in my power class where we did an actual manual power transfer to and from the utility lines with a generator. Back then they used 3 light bulbs connected L1 to L1, L2 to L2, L3 to L3 between the generator and the utility lines. When all three light bulbs went out the generator was in synch with the line and you could open and close the transfer switch. Some wise guy wanted to see what would happen if you threw the switch when things were out of sync.. so he threw the switch and we all got to hear the bang when the generator was pulled into sync by the utility. The professor was not amused. I distinctly remember that prof as he later tried to throw me out of college after I found he was using out of date materials and I was forced to confront him with it. Not my best college memory. Fortunately I prevailed, and the department chair assigned a different prof as my advisor. Dave ------------------------------------------------------------------------------ Increase Visibility of Your 3D Game App & Earn a Chance To Win $500! Tap into the largest installed PC base & get more eyes on your game by optimizing for Intel(R) Graphics Technology. Get started today with the Intel(R) Software Partner Program. Five $500 cash prizes are up for grabs. http://p.sf.net/sfu/intelisp-dev2dev _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
