TY - JOUR N2 - The wet flashover voltage of medium voltage insulators made of a silicone rubber is 8% lower than the wet flashover voltage of a porcelain insulator with an identical profile. These surprising results, obtained in 2012, were confirmed again in 2019. The flashover development on the composite insulator is very short (less than 30 ms). On the other hand, on the porcelain insulator, the flashover develops longer (1–3 seconds). The Koppelmann equation was modified, and the Obenaus model to calculate the flashover voltage of insulators under the artificial rain was presented. Attention was paid to the importance of insulator diameters and the phenomenon of water cascades. L1 - http://www.czasopisma.pan.pl/Content/121564/PDF/art07.pdf L2 - http://www.czasopisma.pan.pl/Content/121564 PY - 2021 IS - No 4 EP - 844 DO - 10.24425/aee.2021.138264 KW - flashover KW - leakage distance KW - porcelain insulator KW - silicone rubber insulator A1 - Chrzan, Krystian Leonard A1 - Brzeziński, Henryk Marek PB - Polish Academy of Sciences VL - vol. 70 DA - 2021.11.30 T1 - Anomalous flashovers of silicone rubber insulators under the artificial rain test SP - 835 UR - http://www.czasopisma.pan.pl/dlibra/publication/edition/121564 T2 - Archives of Electrical Engineering ER -