Theory
In the case of a no-loss line, voltage magnitude at the receiving end is the same as voltage magnitude at the sending end: Vs = Vr=V. Transmission results in a phase lag that depends on line reactance X.
As it is a no-loss line, active power P is the same at any point of the line:
Reactive power at sending end is the opposite of reactive power at receiving end:
As is very small, active power mainly depends on whereas reactive power mainly depends on voltage magnitude.
Read more about this topic: Flexible AC Transmission System
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