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I built a wind turbine a while back and have been using it to power lights in my house. It gives out 3-phase in star setup with no neutral. Neutral is buried in epoxy resin in the casting.

It feeds into a three phase rectifier down at the house and charges batteries. Generates 500 W peak.

I recently got my hands on a good number of single phase toroidal 400 W each transformers. I want to use them to step up the voltage at the base of the pole and step back down at the far side as it is a long distance (100 meters) and might give less voltage drop with higher voltage using these.

How can I connect these? Any diagrams I see online seem to require the neutral to be available.

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  • \$\begingroup\$ You could probably connect them across the phases as if your turbine was Delta. Do you know what voltage you get from the turbine and how it compares to the ratings of your transformers? \$\endgroup\$
    – brhans
    Nov 22 '21 at 23:46
  • \$\begingroup\$ What is the voltage out of your generator? what is the voltage rating of the transformers you have? \$\endgroup\$ Nov 23 '21 at 0:34
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    \$\begingroup\$ I would be inclined to connect delta-wye - transmission line - wye-delta if the transformer voltage permits. You should not need any neutral connections. \$\endgroup\$ Nov 23 '21 at 0:59
  • \$\begingroup\$ The Voltage out of my generator is 0-30v. The transformers are for mains use down to 16 and 24v \$\endgroup\$
    – Omasín
    Nov 23 '21 at 17:53
  • \$\begingroup\$ Frequency will be a potential issue. For eg 60 Hz rated transformers higher frequencies within reason will work. Lower frequencies will allow less peak voltages without saturating. Much higher frequencies will reduce allowable power levels.|| Connect primaries phase to phase in a delta and secondaries the same. Same in reverse at other end. \$\endgroup\$
    – Russell McMahon
    Nov 24 '21 at 5:46
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The transformers are to be 'star' connected using the 16 V secondaries.

enter image description here

Maximum transmission voltage would be about √3 times the transformer primary (mains) voltage.

It would be needless to connect the neutral points.

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  • \$\begingroup\$ Its not an alternator unfortunately. its made from scratch its an axial flux generator. Im afraid your diagrams aren't making a lot of sense to me in this context. \$\endgroup\$
    – Omasín
    Nov 23 '21 at 17:58
  • \$\begingroup\$ Hi Omasin, What I had shown was a radial flux alternator with 3-phase armature and field windings. My answer has been edited. \$\endgroup\$
    – vu2nan
    Nov 24 '21 at 4:32
  • \$\begingroup\$ Omasin - axial flux generator IS an alternator. \$\endgroup\$
    – Russell McMahon
    Nov 24 '21 at 5:48
  • \$\begingroup\$ Thanks, was just stressing it wasnt from a car. \$\endgroup\$
    – Omasín
    Nov 24 '21 at 9:02

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