Numerical -Inductance of each conductor for given parametersin a three phase, 3 wire system

Q.  What will be the inductance of each conductor in a three phase, 3 wire system when they are arranged in a horizontal plane with spacing such that D31= 4m, D12 = D23 = 2m. The conductors are transposed and have a diameter of 2.5 cm.
- Published on 24 Nov 15

a. 2.22 mH
b. 1.11 mH
c. 3.33 mH
d. 4.44 mH

ANSWER: 1.11 mH

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