Considering load balance and efficient use of generator winding, reduce the load of a single generator winding
Use all four wires
Each of the three live wires are connected to zero
9KW is the power that can be obtained when the load of the three-phase four-wire system is balanced. If you only use one light and one zero, you only use one. phase to produce electricity. The winding can only supply up to 3 kW, that is, it can drive a 3 kW single-phase motor. It's impossible to fly three of them. At this point, one must be connected to each phase, and one winding corresponds. to a motor, so that a single winding does not exceed the burnt load