But!!! You will need to buy in transformers to handle the high voltage and get it to a level
You can start to think of being able to get into an Arduino - for safety and isolation .
Then you’ll need to level shift the waveforms and read each around 100 ( or more ) times a second to be able to calculate voltage in your software .
This will cost you in time and money to get sorted . Cheaper to buy Especially given the safety aspects
Remember, folks. the OP has a DELTA configuration for his power. There is no ground nor common connection. Any ground is a safety ground.
I am not clear is the OP wants to measure the voltage on each phase, independently, or will just one phase voltage be sufficient.
Any voltage measuring without a transformer will be very dangerous because the Arduino, no matter what it is will be referenced to a ground or a common wire. A transformer will not only provide isolation and a known ratio to the generator voltage, but allow a real ground or common connection.
Paul
CAUTION
With the frequency dropping to 25 Hz (or even 40 Hz) you cannot use a typical transformer. It will saturate and act like a short.
You might:
Use a transformer the is 4X the input voltage rating. Transformer saturation is specified as Volt-Seconds. This is unlikely as the voltage specification would put the transformer in the very special insulation class.
Or perhaps you can get a small transformer mfg to make you some special transformer(s).
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