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Surge impedance loading of a lossless 400 kV three phase 50 Hz overhead line of average surge impedance of 400 Ω is:
  • a)
    200 MW
  • b)
    400 MW
  • c)
    1600 MW
  • d)
    100 MW
Correct answer is option 'B'. Can you explain this answer?
Most Upvoted Answer
Surge impedance loading of a lossless 400 kV three phase 50 Hz overhea...
Concept:
The surge impedance or characteristic impedance of a long transmission line is given by,
Z is series impedance per unit length per phase
Y is shunt admittance per unit length per phase
The surge Impedance for the transmission line is about 400 ohms it is around 40 ohms for underground cables.
Surge impedance loading (SIL):
Surge impedance loading is defined as the power load in which the total reactive power of the lines becomes zero. The reactive power generated by the shunt capacitance is consumed by the series inductance of the line.
Calculation:
Given:
Surge impedance (ZC) = 400 Ω
Voltage (V) = 400 kV

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Surge impedance loading of a lossless 400 kV three phase 50 Hz overhead line of average surge impedance of 400 Ω is:a)200 MWb)400 MWc)1600 MWd)100 MWCorrect answer is option 'B'. Can you explain this answer?
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