Figure 10 shows the field intensity distribution at the
same moment at the two probe surfaces. It can be seen that it
takes shorter time for the wave head of electromagnetic wave
passing through disc-shaped insulator to arrive; the
electromagnetic wave passing through disc-shaped insulator
propagates along high-voltage conductor from the bottom to
the top, while that passing through basin type insulator
propagates along the inner wall of GIS shell from the bottom to
the top; the regional distribution of field intensity at probe
surface 1 is relatively concentrated, while that at probe surface
2 is relatively homogeneous.