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Question

# A 3-phase, 220 kV, 50 Hz transmission line consists of 2 cm radius conductors spaced 3 m apart in equilateral triangle form, the air temperature is 20° C. Atmospheric pressure is 75 cm of Hg and irregularity factor is 0.85. If g = 21 kV/cm (rms), then the line-to-line critical disruptive voltage is

A
310.86 kV
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B
240 kV
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C
179.49 kV
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D
73.33 kV
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Solution

## The correct option is A 310.86 kVVa0=g0δm0rln(dr) Air density factor, δ=3.92bt+273=3.92×75273+20 δ=1.0034 Va0=0.85×21×2×1.0034ln(3002) =179.48kV/phase Critical disruptive voltage =179.48×√3=310.86kV

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