A long overhead lossless power transmission line is terminated with its characteristic impedance. While the line is in operation
A long overhead lossless power transmission line is terminated with its characteristic impedance. While the line is in operation
Right Answer is:
There is no reflected wave on the line
SOLUTION
The two important electrical properties of a symmetrical network are:
- Characteristic impedance (Zo)
- Propagation constant.
Characteristic Impedance (Zo)
- Characteristic impedance is a fine and useful concept of the transmission line.
- When no part of the power sent down an infinite line returns no reflection, there is no loss of power.
- When a line that is terminated at its characteristic impedance, behaves as an infinite line, it will also have no reflection.
- A long overhead lossless power transmission line is terminated with its characteristic impedance. It indicates that the reflection coefficient is zero.
The reflection coefficient is,
${rm{Gamma }} = frac{{{Z_0} – {Z_L}}}{{{Z_0} + {Z_L}}}$
Where
ZL is the line impedance
Z0 is the load impedance.
Therefore, there is no reflected wave on the line.
- When a line is terminated in its characteristic impedance, it is said to be correctly terminated or termed as a non-resonant line.
- The characteristic impedance of a uniform transmission line is defined as the steady-state vector ratio of the voltage to the current at the input of an infinite line.
- Alternately it is defined as the impedance looking into an infinite length of the line.
- Its unit is Ohms. It is also known as surge impedance.