METHOD AND DEVICE FOR LOCATING FAULT POINT OF TRANSMISSION LINE STRUCK BY LIGHTNING

摘要

PURPOSE: To locate the location of a composite optical fiber overhead ground- wire or transmission line struck by lightning by utilizing the overhead ground- wire. ;CONSTITUTION: A transmitting time delaying means 12 is provided to one end of a composite optical fiber overhead ground-wire 2 stretched between tops of steel towers for transmission line in parallel with transmission lines. By making light signals to incident to the ground-wire 2 from the other end, the variation of the polarized light of the optical signals propagated through the delaying means 12 in a shuttling state in both the outgoing and incoming directions is detected by means of a light receiving section at the other end of the ground-wire 2. The difference in detecting time of the two variation of the polarized light against the optical signals in both the outgoing and incoming directions caused by lightning is measured. From the time difference, the location of the ground-wire 2 or transmission line 1 struck by lightning is located.;COPYRIGHT: (C)1996,JPO