Fault locating algorithm based on phase characteristics for hybrid high voltage transmission line

A fault locating algorithm based on phase characteristics is proposed for the hybrid transmission line,which defines a new fault locating function.The phase of fault locating function changes abruptly at the fault point only once when the location of reference point changes from its left side to its right side,which can be used to quickly locate the fault point.Without identifying the faulty section,the hybrid transmission line is equalized a line with the same length for fault locating.The proposed fault locating algorithm has no dead zone and is nearly immune to transition resistance,fault type,sampling frequency,fault position and load current,which are verified by PSCAD simulation.