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Fault detection

  • US 4,837,519 A
  • Filed: 12/07/1987
  • Issued: 06/06/1989
  • Est. Priority Date: 09/06/1985
  • Status: Expired due to Term
First Claim
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1. Apparatus for the detection of a fault signal in a supply system including conductors from a supply for supplying power to a load connected in the system comprising an impedance element for connection across the power supply, a tapping point to the impedance element, a connector between the tapping point and a point to complete a circuit for a fault signal in the system, an interrupter for periodically pulsing a signal into the system effectively thereby to generate a pulse interrupted fault signal, a detector for location relative to the system for sensing the pulse interrupted fault signal and thereby providing for detecting the location of the fault, and means for operating the detector in synchronism with the interrupter whereby the detector senses a substantially steady state level of the pulse interrupted fault signal.

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