According to the situation you presented, this is simply an alarm signal and the value of the grounding protection action has not been achieved. I suggest you do the following:
1. Have a relay protection professional check. and confirm that the protection is not malfunctioning;
p>2. It must be a stator water cooled generator. Check whether the pH value of the stator water is qualified, and replace the stator water with water;
3. Check the appearance of the generator to see if it is neutral. Check if the PT is disconnected or has poor contact;
4. If the above inspection and treatment cannot be carried out. disposed of, please ask the dispatcher to shut down the machine as soon as possible for inspection and treatment.
5. After shutdown, you can determine if it is truly grounded with an insulation test