current pulses from 120 to 250 mA current range. By adding
the number of pulses in these two intervals, the highest
activity of current pulses occurred on the surge arrester with
pollutant layer with 5.825059 E+06 pulses. The sum of
pulses in the bushing without pollutant layer is 5.580349
E+06, and in the bushing with pollutant layer, it is
3.109533 E+06 pulses. In this case, the activity in the
surge arrester is attributed to hydrophobicity lost through
this evaluation, as is shown later. Therefore the surge
arrester’s insulation is most susceptible to ageing.
From the 260–320 mA current range and higher ranks, the
highest peak frequency is recorded in the bushing and
the surge arrester with pollutant layer (Figs. 3a and c). The
lowest number of pulses on the surge arrester is because of
its longer leakage distance compared to that of the bushing,
which is about 69% as shown in Table 3. Therefore the
development of a pollution flashover is of lower probability
in the surge arrester than in the bushing. Based on this, the
pollution flashover process in polymeric insulation depends
current pulses from 120 to 250 mA current range. By addingthe number of pulses in these two intervals, the highestactivity of current pulses occurred on the surge arrester withpollutant layer with 5.825059 E+06 pulses. The sum ofpulses in the bushing without pollutant layer is 5.580349E+06, and in the bushing with pollutant layer, it is3.109533 E+06 pulses. In this case, the activity in thesurge arrester is attributed to hydrophobicity lost throughthis evaluation, as is shown later. Therefore the surgearrester’s insulation is most susceptible to ageing.From the 260–320 mA current range and higher ranks, thehighest peak frequency is recorded in the bushing andthe surge arrester with pollutant layer (Figs. 3a and c). Thelowest number of pulses on the surge arrester is because ofits longer leakage distance compared to that of the bushing,which is about 69% as shown in Table 3. Therefore thedevelopment of a pollution flashover is of lower probabilityin the surge arrester than in the bushing. Based on this, thepollution flashover process in polymeric insulation depends
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