can be seen from the comparison on Figure 13 (a) and (b)
that the attenuation amplitude and low-frequency component of
electromagnetic waves are relatively great in GIS with threephase
common enclosure. Figure 14 shows the field intensity
distribution of probe surface xy plane: z=120. Apparently, the
wave head of electromagnetic wave in GIS with one-phase
single enclosure mainly propagates along the periphery of
conductor, while that in GIS with three-phase common
enclosure mainly along the middle of three conductors, with
relatively long time for resonance attenuation.