[BC] Transformers needed

[RichardBJohnson at comcast.net]

These folks (signal) are in New Hampshire. They will make you
whatever you need.

http://www.regionalmfg.com/50-60-400-hertz-transformers.html

Attempts to hack together something from a bunch of junk transformers
will not be cost effective in the long run. You need two identical
transformers with 60 V ac wye-connected primary (saves cost and
wire) with 600 V ac wye-connected secondary. Such transformers
consists of three identical coils (cheap) on the same iron. The
size if based upon equal copper and core losses. If your
turbine generates power while coming up-to-speed, the
iron needs to be sized for that. For instance, with a
2 kilogauss field (max recommended for 2% SI steel),
the magnetics need to be 30% larger for 50 Hz than
for 60 Hz.

For 500 VA transformers, you will probably pay $500 for
the pair if it's a good day in Concord, New Hampshire,
and they are looking for work.

You need to make your own bug-proof box.

FYI, in Massachusetts we can't put new electrical
generation equipment on old dams unless they
are Beaver Dams (Beavers are protected). Otherwise
we would need to provide eel ladders for non-existent
eels to get over the dam. Eels, if they existed, would
require over a mile of "ladder" to crest a 10 ft dam
because they can't climb very well.

I'm not making this up, read about an attempt to
resurrect a perfectly-good existing dam.

http://www.mtpc.org/Project%20Deliverables/GB_CII_Feasibility_Wrights_Final.pdf



--
Cheers,
Richard B. Johnson
Read about my book
http://www.LymanSchool.org


 -------------- Original message ----------------------
From: Mike McCarthy <Towers at mre.com>
> Take a look at the medium voltage products. Everything below 600V is 
> considered low voltage for the purposes of the NEC and UL
> 
> If you look at distribution products, there are some which are 4KV in and 
> 240 out.
> 
> I would avoid going above 600V as you need special cable and switch gear to 
> be safe and code compliant.  Step up from the 60V to 480 (8:1) and your 
> project should be good to go with standard switch gear, THHN cable, and 
> fusing.  Then you need to consider how to convert that to 120...
> 
> Which is a whole different animal....
> 
> MM
> 
> 
> 
> At 07:32 AM 10/24/2007 -0600, Bill Sepmeier wrote
> 
> >Greetings, all ...
> >
> >I'm looking for some relatively small transformers so that I can complete 
> >a micro hydro electric project out at my place.
> >
> >I have a 3kW 6 phase alternator on a 10" Francis turbine that produces 
> >60VAC / 500 watts max per leg, as two three phase WYE outputs.  I want to 
> >step this up to 600 VAC for transmission over about 900 feet, then step it 
> >back down again.  Four 3 phase xfmrs, or 12 single phase xfmrs will work, 
> >but I'm having difficulty finding anything at 10:1.  I could use 5:1, 
> >minimum, it'll just require bigger interconnect wire.
> >
> >If anyone has a line of these little beasts, new or used, please let me 
> >know....
> >
> >Bill
> >
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