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Recommendations for three phase variable inverter transformer / variac
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Jeroen3:
You don’t direct start 150kVA… and you still need a way to change 50/60hz! Sure you can get another transformer, of many kilos, if you want.
Zero999:

--- Quote from: Jeroen3 on February 06, 2023, 08:48:54 pm ---You don’t direct start 150kVA… and you still need a way to change 50/60hz! Sure you can get another transformer, of many kilos, if you want.

--- End quote ---
I don't follow.

My question is: why bother with a motor generator set, if you have a VFD? Why not just use an VFD and a transformer? It'll be much smaller than a motor generator set.
Jeroen3:
The waveform from a VFD through a transformer is not usable. I've tried that. Plus a lot of the common mode noise leaks through.
I'd avoid going this way thinking it's cheap.
Zero999:

--- Quote from: Jeroen3 on February 07, 2023, 07:05:31 am ---The waveform from a VFD through a transformer is not usable. I've tried that. Plus a lot of the common mode noise leaks through.
I'd avoid going this way thinking it's cheap.

--- End quote ---
Isn't that what filters are for?
Jeroen3:
Yes, even with two transformer and filters it is still very noisy.
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