As for the power supply, the generator can supply power normally whether it is grounded or not.
In accordance with regulations, the neutral wire of the 380/220 power system and the metal shell of the equipment must be grounded under all circumstances.
The neutral point of the generator is the neutral line. Neutral point grounding (neutral line grounding) is called working grounding. After working grounding, there will be voltage between ground and three-phase lines. When all three phases have an insulation problem between the wires or between them, the ground voltage changes. When the monitoring system detects this change, it sends signals and instructions to know that there is a problem with the. circuit. Especially when a phase line is faulty and grounded or touches a grounded metal, the phase line current of the systemThe neutral point grounding voltage will increase rapidly and trip to prevent fault expansion.
Grounding the generator case or electrical equipment case is called protective earthing, which means that the metal case of the equipment is at the same potential as the earth, so that if someone touches the casing when the equipment leaks, they will not be shocked.
For a 300 KVA generator, the neutral wire and the metal shell of the generator can be grounded at the same time, and the grounding resistance cannot be less than 4 ohms.