What you say is not correct. This is the current practice in many situations, but it is not actually the most scientific. According to weighing various situations, there are advantages and disadvantages, but after weighing, your point of view. , the most reasonable grounding method is to adopt a three-phase three-wire system at the end of the generator, that is, the neutral point is not grounded.
Failing to ground can reduce the generation of harmonic currents in generators and transformers.
However, the problem caused by not being grounded is how to implement grounding protection? Generally, protection is obtained after detecting a large short circuit current after a short circuit. Indeed, at this time, protection that detects the three-phase earth voltage can be used. Or other protection againstzero sequence voltage, etc.
The neutral point of the generator cannot be grounded here. The main reason is that the generator here does not provide power directly, but the transformer does. Therefore, even if the generator has a three-phase, three-wire system, if a single-phase short to ground occurs in the stator, which will cause the phase voltage of the other two phases to increase, you will be fine , because the phase voltage of the generator is not transmitted to the single-phase load at all. Don't be afraid of damaging single-phase loads. There is also no problem with the user's personal safety.
So you have to analyze it yourself and stick to what you think is a reasonable point of view. What most others say is not necessarily true. On this issue, many people have written articles on the Internet. and I discussed it. It's my point of view. Yous can check it yourself.