*5.3. Air Humidity*

The effect of the air humidity is here analyzed varying the critical electric field according to Reference [21]. A minimum value of 2 g/m<sup>3</sup> and a maximum value of 25 g/m<sup>3</sup> are here considered. Considering *m* = 0.8, a line diameter of 10 mm and the line details previously described, Figure 7 shows that the influence of the air humidity is substantially negligible. This is ascribed to the low variation of the critical electric field according to Reference [21].

**Figure 7.** Percentage variation of the number of flashovers as a function of the air humidity—the red dot line represents the case when the corona effect is not considered.
