Fault point localization of power feeding lines in optical submarine cables

As techniques for locating the fault position of the power feeding line of the optical submarine cable, the electric time domain reflector, and the AC resistance measurement are discussed. Authors measured the fault position of the cable that was subject to fault using these two methods. The actual fault point was directly located by divers using AC magnetic field detection method. Comparison of both results confirmed the validity of the electrical fault localization method. The frequency dependency of the pulse propagation velocity in the armored cable was obtained based on the measurement result of the frequency response of the AC resistance measurement of the cable.