The invention relates to a distributed single-phase earth fault
ranging system that is used for realizing
ranging of a fault on a
high tension transmission line between two
transformer substations. The
system comprises: at least two sets of fault current detection device sets, which are installed at preset test points of a
high tension transmission line; a remote
wireless communication module; and a remote monitoring
master station. The remote monitoring
master station is respectively connected with the fault current detection device sets by the remote
wireless communication module as well as receives fault currents collected by the fault current detection device sets by the remote
wireless communication module; and the remote monitoring
master station carries out comparison and an analysis according to positional data of the preset test points and length data of the
high tension transmission line, so that a final fault position is obtained. In addition, a
ranging method of the distributed single-phase earth fault ranging
system is also provided.
Power frequency fault current information and fault current travelling wave
energy information are utilized to determine fault intervals; and different positioning equations are selected according to different fault intervals as well as fault point positions are determined; therefore, a dead zone problem can be solved, wherein the problem occurs when there are faults at a head and an end of a line, that is, when a fault point approaches a
bus.