Estimate the SFFOR for each of the lines of problem 3 of Chapter 2. Assume
that the phase conductor surge impedances are 465,455, and 472 ohms for the 34.5-,
69-, and 115-kV lines, respectively. Use the Brown-Whitehead and the IEEE-1992
striking distance equations. Assume a ground flash density of 5 flashes/km2-year.
Use the regular CIGRE current distribution, assume that the minimum current is
3 kA, and do not consider subsequent strokes. Use the computer program SFFOR