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Question:

What voltage would I need to run a 100kW thee phase AC motor?

And what fuses would I need?

Answer:

its roughly a 135Hp so it would most likely be a 440VAC motor.
It shows that info on the motor nameplate...I think you need to add a factor to the FLA for the fuse size...
Assuming a Y connection, each phase uses 1/3 of the total power. P(phase) = P(total) / 3 = 33 kW. P(phase) = V(phase)^2 / R(phase). You've given P, and asked for V, but didn't specify R.
You would likely use as a minimum 277/ 480 Volts, the current draw per phase would be120 amps. I'd guess the fuses would be 200 amp.
There is no theory that would indicate a specific operating voltage. The voltage would be a matter of standard voltages in use in whatever part of the world the motor might be installed. As a practical matter, motors of higher power ratings are operated at higher voltages because the required current is difficult to deal with if the voltage is too low. Since the motor is rated in kW and not horsepower this is probably a 50 Hz IEC standard motor. In the 50 Hz, IEC parts of the world the most likely voltage alternatives would be 400 volts and 690 volts. In the USA, 460 volts would be most likely. In Canada, 575 volts would be most likely.

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