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Detector for locating underground cables and faults therein using high-powered electromagnet

  • US 5,210,498 A
  • Filed: 10/24/1991
  • Issued: 05/11/1993
  • Est. Priority Date: 04/25/1989
  • Status: Expired due to Fees
First Claim
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1. A method for locating from above the ground or water a cable fault in a pair of wires in a cable buried underground or underwater, said method comprising transmitting an indicator signal created by a magnetic field, said magnetic field being generated by a magnet located at an indicator signal transmission point which induces a current in the wires of a cable (3) to be examined, and monitoring the indicator signal by a receiver (4) connected to the cable, characterized in that between the wires of the cable (3) is supplied a direct voltage which induces a current which closes a loop through a faulty location (9), and that the indicator signal is monitored separately from the current produced by said direct voltage.

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