Fault location device and method

  • US 6,819,115 B1
  • Filed: 05/16/2002
  • Issued: 11/16/2004
  • Est. Priority Date: 08/11/1999
  • Status: Expired due to Fees
First Claim
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1. A device for determining location of a fault in an underground cable causing an earth leakage path from an internal conductor to earth at the location of the fault whereby, when signal is applied to the conductor, earth leakage signal flows between the earth and conductor at the location of the fault, wherein the applied signal is a multi-frequency signal having at least two frequency components, the device comprising:

  • probe means positionable to receive the earth leakage signal, and means for rectifying a first component of the earth leakage signal corresponding to a first frequency component of said applied signal, multiplying a rectified first component of the earth leakage signal with a second component of the earth leakage signal corresponding to a second frequency component of the applied signal and, from the result of said multiplication, determining a direction from the device to the fault.

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