The minimum insulation requirement of a 500 kV line is | Power Transmission and Distribution MCQ#72

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The minimum insulation requirement of a 500 kV line is:

  1. 139 kV
  2. 228 kV
  3. 317 kV
  4. 692 kV

Correct answer: 3. 317 kV

From formula: 500  kV * 1.1 / 1.732 = 317 kV

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