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Using a 3-phase generator for 1-phase load

Using a 3-phase generator for 1-phase load

Using a 3-phase generator for 1-phase load

(OP)
I have a 3-phase 208 volt emergency generator that I want to use for single phase loads.  Is there any problem with running the generator for prolonged periods while only using two of the three legs?

---KenRad

RE: Using a 3-phase generator for 1-phase load

Why not install a 120/208 3 phase panel and balance your single phase load on all phases?

RE: Using a 3-phase generator for 1-phase load

If you have access to both ends of all three windings you can connect them so that you get 120/240 single phase using all three windings.   /\._  Each line is one winding, the dot is the neutral.

RE: Using a 3-phase generator for 1-phase load


wareagle has the best suggestion—it permits full-capacity-genset loading.  If no 120V loads are served, you could also jack that puppy's AVR up to 139V/coil and get 240V ø-ø times three.

For connecting “edison 3-wire” service to a 12-lead stator, see page 6+ of www.marathonelectric.com/generators/BROCHURE/GPN016.pdf   In all three cases reduce available power to two-thirds of nameplate.

•  DOUBLE-DELTA—SINGLE-PHASE CONNECTION   Most typical arrangement.

•  LOW ZIG-ZAG—SINGLE-PHASE CONNECTION   {Also termed “Le Blanc”}  Less voltage balance with respect to neutral, and the fun of making two sets of 4+ wire pigtail wads.

•  HIGH-VOLTAGE—SERIES-DELTA CONNECTION    {Abandon/tape off “L1” external connection}  Fine for 120/240V 3-wire if full neutral current is not needed {<50%.}  Makes easier pigtail bolting/taping.  
  

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