for AC systems during an intermediate period, use of pantographs capable of operating with three targets curves (Cl, C2 and target curve) for the mean contact force Fm is necessary,
za enofazne (AC) sisteme je v vmesnem obdobju za povprečno kontaktno silo Fm potrebna uporaba odjemnikov toka, ki lahko delujejo s tremi ciljnimi krivuljami (C1, C2 in ciljna krivulja),