Hi There,
Thanks for the helpful comments. Hydro is 400V 3 phase AC. I have a 1500 foot underground feed back to the house I would like to hear if anyone has done this and what were the issues to watch for. Here in NZ streams change level very fast summer or winter. I am planning to rectify to DC and then use three windyboy1700's one on each local 230V phase. I will hunt down the hydro group also for further information. Many Thanks all Carl E. _____ From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of jay peltz Sent: 1 October 2008 4:07 a.m. To: RE-wrenches Subject: Re: [RE-wrenches] Micro Hydro control Hi Carl, Yes there are some options. If you use a good pressure activated switch, you can turn on/off slow opening electric valves as flow changes. IE so as the flow drops, the pressure drops and at the activation point, the relay closes one or more valves allowing the pressure to build up at which point the valve will open again. For finer regulation you might need more than one valve to have a relay and more than one pressure switch. Its can be pretty expensive, but it does work. What voltage is the turbine? This helps to know if you can use the turbine power to control the valves. thanks, jay peltz power On Sep 29, 2008, at 9:36 PM, Carl Emerson wrote: Hi there gang, We are looking at a 4kW PM hydro for a client and was wondering if anyone has done an automated control of flow into such a unit so as to limit the amount of water being taken from the stream in the Summer. This is usually done manually by closing down nozzles on the unit but here in NZ weather changes fast and the unit is 500M from the house. Summer rains can be significant and sudden. We are planning a 6inch pipe with around 100 ft of fall, the stream when low will allow a flow of 20Litres/sec but when high will deliver twice that amount. Any suggestions?? Thanks Carl Emerson Freepower Ltd. Auckland NZ _______________________________________________ List sponsored by Home Power magazine List Address: RE-wrenches@lists.re-wrenches.org Options & settings: http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org List-Archive: http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org List rules & etiquette: www.re-wrenches.org/etiquette.htm Check out participant bios: www.members.re-wrenches.org
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