The results obtained indicate insufficient dielectric strength design, even for a gap in the unpolluted
particles and decomposition products in SF6. The gas gap dielectric strength a-b is slightly greater than the
withstand test voltage. Discharge voltage along the surface of the solid dielectric d-e is 0.77 of the withstand
test voltage. Possible discharge path c-d-e-f is represented of electric line of force in the investigated gap,
however, as shown in [5] the discharge gap along the surface of the dielectric may have another way.
Thus there is a high probability of electrical discharge occurrence in the gap either a-b or c-d-e-f.