1.A balanced three-phase source of 400 V, 5 Hz rating is loaded
by a balanced load. Each phase of the load is 5 100 W
incandescent lamps. Will there be a visible flicker in the lamps?
If yes, explain why?
2. The source in the preceding question is used to deliver power
to a balanced three-phase AC motor driving an industrial fan.
Will there be fluctuations in the fan speed? Assume that the
supply voltage and the fan load are maintained at constant
levels.
3. The double-frequency oscillation in three-phase instantaneous
power is zero in balanced systems even for a reactive load.
Does it mean that ...
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