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.
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