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Fault detector

  • US 4,881,028 A
  • Filed: 06/13/1988
  • Issued: 11/14/1989
  • Est. Priority Date: 06/13/1988
  • Status: Expired due to Fees
First Claim
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1. A fault detector and indicator for monitoring the current in a power line which may be immersed in water comprising, a detector mounted adjacent the power line, magnetic coupling means coupled to said power line and supplying an output to said detector, a light generator in said detector receiving the output of said magnetic coupling means and producing light emission in response thereto, a fiber optics cable with one end attached to said detector such that it receives light energy emitted by said light generator, and an indicator located remotely from said detector connected to a second end of said fiber optics cable and producing an indication from the received light energy indicative of the current in said power line, wherein said indicator includes a photo-voltic cell which is mounted so as to receive light energy from said second end of said fiber optic cable and indicating means connected to said photo-voltic cell, wherein said indicating means includes first and second display means for, respectively, displaying indications of "normal" or "alarm" conditions for the current monitored in said power line, including a threshold detector connected to the output of said photo-voltic cell, a two-way switch with a moveable switch contact connected to one output lead of said photo-voltic cell and with two fixed contacts, respectively, connected to said first and second display means, a second output lead of said photo-voltic cell connected to said first and second display means, and a relay connected to receive the output of said threshold detector and connected to the moveable contact of said two-way switch.

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