公开(公告)号：US11061061B2

公开(公告)日：2021-07-13

申请号：US16349894

申请日：2017-11-15

申请人： RADIODETECTION LIMITED

发明人： Mark Marsden ,  Peter Mann ,  Charles Alexander ,  Jeff Thompson

IPC分类号： G01R31/08

摘要： Methods, systems and locators for detecting faults in an insulation layer of an insulated conductor buried beneath a ground surface are described. The locator comprises a magnetometer arranged to detect a magnetic field generated by the alternating current and to generate a current signal on the basis of the detected magnetic field, and an Alternating Voltage Gradient receiver comprising a pair of probes arranged to make electrical contact with the ground surface, which is arranged to generate a voltage signal indicative of a voltage between the pair of probes. A processor is configured to substantially synchronously sample the current signal and the voltage signal. This enables improved detection of faults in the insulation layer of the insulated conductor.