For an overhead line, the surge impedance is taken as
For an overhead line, the surge impedance is taken as
Right Answer is:
400 – 600 ohms
SOLUTION
Surge Impedance
- In power system, the characteristic impedance is sometimes referred to as surge impedance.
- It is defined as the √Z/Y where
Z = series impedance of line
Y = shunt admittance of the line - For a lossless line, the surge impedance reduces to √(L/C) a pure resistance.
- Its value is normally 400 to 600 ohms for an overhead line while for underground cable its value is typically between 40 to 60 ohms.