Patent ID: 8183871

Claim:
A method for locating a fault in a two-terminal power transmission or distribution line, the method comprising: receiving measurements of three phase currents from each of the two terminals, receiving measurements of three phase voltages from one of the two terminals, receiving transmission parameters of the distribution line, receiving the fault type, determining the symmetrical current and voltage components corresponding to the phase currents and phase voltages, determining a fault loop voltage seen from the one of the two terminals based on the corresponding symmetrical voltage components and on the fault type, determining a fault loop current seen from the one of the two terminals based on the symmetrical current components of the one of the two terminals, on the transmission parameters and on the fault type, determining a total fault current based on the symmetrical current components and on the fault type, determining the distance to fault seen from the one of the two terminals based on the fault loop voltage on the fault loop current and on the total fault current, and outputting the distance to fault to an output interface.