Other factors such as the load current and load voltage have
an important impact in RUL. Of course, the amplitude and duration
of the faults and their frequency of appearance impact RUL.
However, in this study we focused on RUL under the exact conditions
that an SFCL must face for the American Electric Power
(AEP) reclosure sequence. For this reason we followed the AEP
standards, shown in the AEP sequence in Fig. 2, paying special
attention to the worse case scenario found between the 2nd and
3rd faults. Duration and frequency of repetition of the faults as
well the load time frames between faults are given in this graph.
In order to study the influence of the load current and voltage
versus the fault during the recovery process, we kept constant
the fault magnitude for a number of different levels of load currents
and voltages.