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Means and method for measuring electrical-ground resistance between earth-separated locations

  • US 3,913,010 A
  • Filed: 04/30/1974
  • Issued: 10/14/1975
  • Est. Priority Date: 07/16/1973
  • Status: Expired due to Term
First Claim
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1. As an article of manufacture, a unitary ground-resistance measuring set adapted for use with a local earth-ground connection at one end of an elongate electrical multipleconductor cable the other end of which includes at least two conductor connections to a remote ground to earth;

  • said set comprising resistance-bridge elements consisting of elements of two conjugate arms for connection between opposed first diagonal bridge terminals, one of which terminals is said remote ground and the other of which is contained in said set;

    a monitoring variable resistor connected at one end to the first diagonal bridge terminal of said set and having means at its other end for connection to said local earth-ground connection, whereby said monitoring resistor may be connected in series with the earth between cable ends to define one of the conjugate arms, and whereby the local earth-ground connection may be one terminal of the second diagonal of the bridge;

    two series-interconnected resistance members forming elements of the other conjugate arm and connected at one end to the first diagonal bridge terminal of said set and having means at its other end for connection to one of the remote-grounding conductors of said cable, the point of interconnection of said resistance members of said other conjugate arm defining the other terminal of the second diagonal of the bridge;

    d-c source supporting means at said set and having first and second pole connections to the terminals of one bridge diagonal; and

    voltage-responsive means at said set and interconnecting the terminals of the second bridge diagonal;

    the diagonal connection to said remote-ground terminal being via the other remote-grounding conductor of said cable.

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