and thus will decrease the required shielding angle
for a desired SFFOR. To illustrate this effect assume a desired SFFOR of 0.05
flashovers/lOOkm-years. The resultant required shielding angles are shown in
Table 2. If the ground level CIGRE distribution per Chapter 6 is used, the required
shielding angles decrease by only about 8 %. Because of this small decrease and all
the other variabilities of selecting the shielding angle, the use of the original CIGRE
distribution will be maintained.