Numerical - Critical voltage for given parameters of 3 phase line

Q.  What is the critical disruptive voltage of a three phase line which has a conductor of 2 cm in diameter which are spaced equilaterally 1m apart, if the dielectric strength of air is about 30 kV/cm, and air density about 0.952 and irregularity factor 0.9?
- Published on 24 Nov 15

a. 152.36 kV
b. 146.235 kV
c. 144.95 kV
d. 111.235 kV

ANSWER: 144.95 kV

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