RS. . .
Although it's been some time since our last communication, curiosity has pushed me to provide the Negative-Sequence analysis of your Double-Delta configuration. I've chosen for the two-120Vac loads and single-240Vac load the proportion RW:BW:RB as 2:4:6 kVA, respectively. Am I close to your current operation (pls excuse the pun) ?

Secondly, have you noticed any oscillation in operational speed, voltage, current, exciter parameters, or engine sound ?
Regards, Phil Corso

 

Ladies and Gentlemen,
Attached is a 3-part pdf covering a Negative Sequence Effect on Single-Phase Loading of 3-Phase Gensets.
Part 1 covers Double-Delta and Equivalent 3- Loop Solution
Part 2 covers Mesh-Analysis to Calculate Loop-Currents
Part 3 covers Delta-A Winding Dissymmetry Determination.
Schematics to come shortly.
Regards,
Phil Corso