The arcs have large probability to jump between sheds when
the gaps between two sheds are small enough. Figure 15c has
the largest leakage distance of all three types of the insulators,
but its performance might not be better than other types of
insulators due to the close spacing of the sheds. Therefore,
investigation of arc jumping between sheds as a function of
gap distances can help engineers to improve the efficiency of
insulator design.