ISRO Electrical Engineering (EE) 2013 - Question 52

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What is the approximate value of the surge impedance loading of a 400kV , 3-phase 50Hz overhead single circuit transmission line

  • A. 230 MW
  • B. 400 MW
  • C. 1000 MW
  • D. 1600 MW

Answer: B. 400 MW

Explanation: SIL = V²/Zc = (400 kV)²/≈400 Ω ≈ 400 MW.

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