M. Jannati; B.Vahidi; SH. Hosseinian and H.R. Baghaee

ABSTRACT
Nearly, 80% of faults in High Voltage (HV) transmission lines are transient in nature. In order to clear
the fault, opening of transmission line is necessary. This results in development of protection equipment.
In the other hand, need for continues supply of loads leads to improve in single phase autoreclosing
equipments. In this paper, a novel and efficient approach is presented to reduce dead time of transmission
line and to have better performance in single phase autoreclosing system in the case that a permanent fault
is happened. The proposed yardstick can decide properly about type of fault (transient or permanent).
Results for the performed simulation in EMTP software applied to a 400kV transmission system
demonstrate authentic of proposed method.