WHY DO TRANSMISSION LINES NOT HAVE NEUTRAL LINE
All transmission lines seen have no neutral line what is mostly seen is usually a 3-wire system (the red, yellow and blue phase) but on the distribution line a fourth wire is seen which is the neutral line.
This essentially is because at the generating station, the output is connected to a Delta-Star transformer or sometimes a Delta-Delta transformer where the HV side is connected to the Delta that requires only 3-wires which are connected in such a way that the voltages are symmetrical and the impedance is balanced thereby making the currents from each line equal in magnitude but are 120degree out of phase hence the sum of all the three phase current equals to zero and does not require any neutral to discharge currents. In = 0.
Apart from the reduction of the I2R losses, this is also the reason why transmission lines are used to transmit high voltages since there will be no loads connected to the lines within such distances.
However, on the distribution lines which is usually called the 415V line, four wires are usually seen which are the Red, Yellow, Blue and Neutral lines, the neutral is gotten from the star end of the transformer.
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whoiscall
Thanks!