and some conservatism is justifiable.
The four formulations of striking distance give a wide variation in shielding
angle. For example, for 0.2 flashovers per lOOkm-year, Fig. 15 shows that the
shielding angle could be 24, 26, 33, or 34 degrees depending on the striking distance
equations used. Love's and Young's equations essentially give the same result, but
the Brown-Whitehead equations are more conservative and the IEEE-1992 equations
more conservative still.