Hi,

I'm hoping someone can help explain what I'm finding difficult to workout.

I have a 200kVA 12 lead MecCalte generator set (alternator) and need to configure between SS (series star for 3 phase) - DD (for single phase) - SZZ (for split phase).

I am not quite understanding how looking at the SZZ configuration the voltage between L-N is the same both sides when you have twice the number of windings one side?

 

The three sets of windings are 120 degrees out of phase so you don't get the simple sum of the voltages. You'll find the voltages match but the source impedance between 12 and 5 is twice that of 1-4