I am looking at a project in Mongolia where the voltages appear to go from 230V 1 ph, 380 3 ph then to 690V 3 ph with distribution at 10.5kV Of interest 690 V for >200 kW.
690 V appears to be 400xroot3 indicating a 400V motor winding in star rather than delta.
Is 690 V a common Non US voltage...