Question

a) What is the three phase system? b) What is the role of Neutral wire in three phase system? c) Is three phase better then single phase system? d) Why is phase balancing important?

Answer 1

shree phase system has three separate identical windings called phases, that are 120° apart and rotate in a common mognetic field and there will be one necetal wire for passing the fault current to the earth is known as the three phase system simply, which uses three wires for generation, fano mission and distribution. 1. Neutral wire will give ua phare voltage & It will provide a path for the unbalanced carrents, to flow to ground. 3. Neutral wire will give a better collage regulation (for u imegular voltages).

- to it acto Net current in neutral in a balanced o phase supply is zem, 54܀ $ ܨ ܚ B - yer, Because of the following :- es constant power an single phase system the instantaneous power varies from zero to peal value at twice the supply frequency. This pulsating nature of power causes problems for many applications. But in a balance 3- phase system the power supplied at all instant is constant

-Higher or Better Olp: the op of 3-phase system is greater than that of single phase machine. It is cheaper, as three phase motors are much smaller and less expensive than single phase motors, due to less material required Three phase does not rezuire special provision to get them started. But single phose rezuires internal standing derice - It has high power facton .. 4) In three phase system, uneznal cuments means unegual woltage drops in the supply impedance of each phase che grounded circuit neutral wire cameos all unbalanced current of the

imbalance is great then the neutral be come Overload, heat up and start fire. this leads to damage of equipment, nt But this not this case in single phose, as there is tuvo conductors only, the currento are automatically equal, so. To need to wory about this. Phase balancing aims to reduce the -. anbalancing of loads on three phases, which causes unbalance currento.

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