(voltage goes down current goes up)
How?basic ohms law if the potential difference goes down (incoming voltage decreases) then across a fixed resistive load the current and power across the load will decrease. Eg if you have 100volts across a 1 ohm load, then it will pull 100 amps. If you decreased the voltage to 50v, then across the same 1 ohm load, it will pull 50 amps. I=V/R .
The power quadruples when the voltage is doubled or the resistance halved. P=VI eg the same 100 volts at 100 amps will be 10000 watts. At 50 volts, and 50 amps, the power is 2500 watts.
If you lost a phase on a 3 phase supply, then the remaining 2 phases would overload at certain points in the 3 phase motors rotation. This would cause a breaker to trip.
I guess you are talking exclusively about inverter drive technology, not the old school stuff!
