| 摘要 |
A method and an apparatus for localizing from above the ground or water the position of or cable fault in a cable buried underground or underwater. An alternating magnetic field generated by a high-powered electromagnet (1, 2) or a rotating magnet induces an indicator signal current in the wires of a cable (3) to be examined. At one or both ends of cable (3) the indicator signal is monitored by means of a receiver (4) connected to the cable wires. The received and amplified indicator signal is transmitted by a radiophone back to the point of transmission, whereat the indicator signal is listened to for detecting the location of a cable and its possible faulty section. According to the invention a sufficient direct voltage is supplied between the wires of the cable (3). This creates a current whose loop closes through a faulty location (9), and the indicator signal is separated from the current produced by said direct voltage. |
