Physics · Power Systems
Which of the following expressions represents the critical disruptive voltage (Vd) for a 3-phase overhead transmission line, where d is the distance between conductors, r is the radius of the conductor, m is the irregularity factor, and δ is the air density correction factor?
Verified Solution4 OptionsUpdated: October 2026👁️1 View
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- 1Vd = (21.1 × m × δ × d) ln(d/r)
- 2Vd = (21.1 × m × δ × r) ln(r/d)
- 3Vd = (21.1 × m × δ × r) ln(d/r)✓
- 4Vd = (21.1 × m × δ × d) ln(r/d)
Correct answer
Vd = (21.1 × m × δ × r) ln(d/r)
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