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Electrical strike system control for subsurface boring equipment

  • US 5,684,466 A
  • Filed: 09/12/1995
  • Issued: 11/04/1997
  • Est. Priority Date: 09/12/1995
  • Status: Expired due to Term
First Claim
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1. An electrical strike sensing system for sensing potentially hazardous conditions to personnel when equipment contacts an electrical power conductor, comprising:

  • a current sensing circuit for sensing current carried by the equipment resulting from said potentially hazardous condition;

    a voltage sensing circuit for sensing a voltage between the equipment and a reference;

    a processor for converting the sensed current to a current percentage of a predefined reference current, and for converting the sensed voltage to a voltage percentage of a predefined reference voltage;

    a predefined threshold value above which dangerous electrical conditions of the equipment are considered to exist;

    a combiner for combining said current percentage and said voltage percentage and providing an output; and

    a comparator for comparing the output of the combining circuit with the threshold value to provide an alarm condition if the combiner output exceeds the threshold value.

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