The performance of a 3-phase generator at the terminals is based on the 3-phase power fundamentals. The generator typically supplies power to more than one load, some of which may be connected in Y and some in Δ. In such cases, the Δ-connected load impedance is usually converted into its equivalent Y-connected impedance equal to one-third of the impedance value in Δ, and combined in parallel with other Y-connected loads.
All calculations are then done on per-phase basis.
Ship generator voltage phase calculation
Y-connected generator phase voltage = 460 V ÷ √3 = 265.6 V