| 摘要 |
Method and apparatus for locating a defect 161 in a transmission line 160. A switch 190 is opened in the electrical loop causing an open circuit 162, 163 or discontinuity at the fault. A signal is transmitted into the transmission wire by a reflectometry system and is reflected at the fault, the reflected pulse being received to determine fault position, for example by using the predetermined signal propagation speed. Opening the switch 190 disconnects power source 170 so that any arcing collapses, resulting in an open circuit when the arc quenches. The method is thus suitable for high voltage supply with wires extending to perhaps kilometres in length, such as power supply circuits in aircraft, ships, factories or hospitals. A series RC snubber 194 may be present to ensure arc quenching and signals may be injected into the line before the switch is opened. |
