Permanent Fault Identification Method for Single-Phasea Adaptive Reclosure of UHVAC Transmission Line

In order to avoid the UHVAC (Ultra High Voltage Alternating Current) transmission line with shunt reactor fault voltage smaller problems, through the analysis of single-phase permanent fault when tripping phase terminal voltage characteristics, this paper presents a fault phase voltage signal of the two order derivative and the original signal ratio of a new method for steadystate frequency discrimination single-phase permanent fault.The principle of this method is simple, and it can avoid the problem that the fault voltage caused by the installation of shunt reactor is small.The adaptability and correctness of the proposed method are verified by a large number of simulations.