Hello Alastair,
As Mike stated earlier, it is most probably that the old generator had some excitation system of his own, you should try figure out if that is still in place, how to be re-comissioned and do some tests. If the existing excitation cannot be used, then you need to know the excitation rated winding data (voltage and current), in order to be able to place an offer request to specialised companies. You need a static excitation device (fed at 380 Vac or similar), as well as an electronic gadget called a synchro-set, which will achieve the synchronisation of your generator to the national grid. It is a clasical procedure (open gradually the inlet valve, the unit starts spinning, your automation starts generator excitation, it permanently compares the amplitude, frequency and phase of the generator voltage with the grid, and when those are in a close match it will connect the unit to the grid, then fully load the turbine, etc.). The power source for the excitation can be from the grid or from battery banks, or similar, depending on the excitation data. Have fun ! Radu ----- Original Message ----- From: "alastair_trower" <[EMAIL PROTECTED]> To: <[email protected]> Sent: Thursday, September 15, 2005 10:30 AM Subject: [microhydro] Non exciting alternator problem > I'm a newbie to the forum, I have recently bought a watermill in south- > west france. There are three francis turbines in place one of which > is currently rigged up for electricity production. When I spin up the > turbine it produces nothing because the alternator is not exciting > itself. I can excite it with a car battery and it works but as soon > as I remove the battery it stops working and with the load removed the > turbine overspins. My question is, how can I research the problem and > could a solution be to feed the excitation coil directly from the grid? > > Many thanks...Alastair Trower > > > > > > > > > > Does your company feature in the microhydro business directory at > http://microhydropower.net/directory ? If not, please register free of > charge and be exposed to the microhydro community world wide! > > NOTE: The advertisements in this email are added by Yahoogroups who > provides us with free email group services. The microhydro-group does not > endorse products or support the advertisements in any way. > > More information on micro hydropower at http://microhydropower.net > > To unsubscribe: send empty message to > [EMAIL PROTECTED] > Yahoo! Groups Links > > > > > ------------------------ Yahoo! Groups Sponsor --------------------~--> Get fast access to your favorite Yahoo! Groups. Make Yahoo! your home page http://us.click.yahoo.com/dpRU5A/wUILAA/yQLSAA/FGYolB/TM --------------------------------------------------------------------~-> Does your company feature in the microhydro business directory at http://microhydropower.net/directory ? If not, please register free of charge and be exposed to the microhydro community world wide! NOTE: The advertisements in this email are added by Yahoogroups who provides us with free email group services. The microhydro-group does not endorse products or support the advertisements in any way. More information on micro hydropower at http://microhydropower.net To unsubscribe: send empty message to [EMAIL PROTECTED] Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/microhydro/ <*> To unsubscribe from this group, send an email to: [EMAIL PROTECTED] <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
