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Forum Index : Windmills : Wire thickness

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Teazle
Newbie

Joined: 11/03/2015
Location: United Kingdom
Posts: 1

Posted: 08:15am 14 Mar 2015

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A newbie question................I'm struggling to find a definitive answer on this.

When choosing the wire for a conventially wired three phase series star connected stator am I right in selecting a guage of wire to take one third of the anticipated total power output.? I.e. a 30amp turbine may be made with coils wound with wire to take 10 amps each.

It makes a big difference to what I am planning!

kitestrings
Senior Member

Joined: 23/04/2014
Location: United States
Posts: 102

Posted: 03:49pm 17 Mar 2015

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Others might be able to help you more, but I'll offer a couple thoughts -

I think the simple answer is no, because of the angular relationship between phases the power in a 3-phase wye circuit is the line-to-line voltage (Vl) x 1.73 x the current.

I assume when you say a "30-amp turbine" it is 30ADC (rectified) at some nominal battery voltage. As an example, at 48VDC (say 50V) and 30A you'd expect about 1500w. Coming from a 3-ph wye alternator the RMS phase voltage would be (50/1.732/1.414 =) 20.4V; line voltage would be (20.4 * 1.732 =) 35.4. So, at 1500w, disregarding losses, our alternator would see (1500/1.732/35.4 =) 24.5A. In a wye the phase current and line current are the same.

You might also find this helpful:
http://www.watlow.com/reference/equations/0101.cfm

and a related explanation from Hugh:
http://scoraigwind.co.uk/2015/02/wiring-loss-in-3-phase-wind-systems/

Good luck, ks

Edited by kitestrings 2015-03-19

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