METHOD AND SYSTEM FOR RETRIEVING AND LOCATING FAULT POINT OF COMMUNICATION CABLE FOR WIRED DISTRIBUTION LINE REMOTE SUPERVISORY CONTROL

摘要

PROBLEM TO BE SOLVED: To provide a method and a system for quickly retrieving and locating a permanent fault, or an intermittent fault or an irregular fault or the like where opening/reconnection of a cable is not required for retrieval and location of the fault point of a remote control cable adopting the 1:n system. SOLUTION: A supervisory signal is injected to an optional part 3c of the communication cable, the supervisory signal is detected from other part 3d, at least either of the magnitude of the voltage and current of the signal is compared with each reference value predicted at the detected part 3d, a fault location F1 is retrieved on the basis of the comparison result, and the fault point is located within a scheduled distance range. Furthermore, if required, the supervisory signal is injected and detected, a pulse signal is transmitted toward the fault scheduled distance range, the distance up to the fault location F1 is measured according to the pulse radar method to locate the faulty point F1.