Chapter 4, Problem 4.14P

To determine

(a)

To prove:

The equation $L_a=\frac{{\lambda }_a}{I_a}=2\times {10}^{-7}\ln \frac{D}{r^{\prime }}\text{H/m}\text{per}\text{phase}$ can also be written as

  $\begin{array}{l}x=k\log \left(\frac{D}{r^{\prime }}\right)\\ x=x_d+x_a\end{array}$

To determine

(b)

The value of inductive reactance per mile per phase.

Effect on reactance when spacing is doubled.