Question

define balanced and unbalanced supply systems​

Answer 1

Answer:

Balanced load in 3 phase system is a condition where all three phases (lines) carry same magnitude of current, with evenly spaced phase difference. If the load is star connected, with neutral as return path, this neutral will carry no current. This is so since vector sum of all three phase currents meeting at common neutral point is zero.

Unbalanced load makes the lines / phases to carry different current magnitudes, and sum total of these at neutral point is not zero. Load in each phase is different, carrying its own current. Neutral in this case carries the net unbalanced current .