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Apparatus with storage for measuring stray currents from subway rails and power lines

  • US 7,221,137 B2
  • Filed: 11/17/2004
  • Issued: 05/22/2007
  • Est. Priority Date: 11/07/2003
  • Status: Expired due to Fees
First Claim
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1. A data measuring apparatus with storage for measuring stray currents from subway rails or power lines and the pipe-to-soil voltage of a buried metallic structure, comprising:

  • measuring means, which is a portable module that allows easy installation at one or multiple measurement points of the buried metallic structure, for measuring stray currents from the subway rails or power lines and the pipe-to-soil voltage of the buried metallic structure simultaneously and for storing and transmitting the measurement data, said measuring means comprising a clamp-on type current sensor (114) that can be attached to a power feeder cable connected to said subway rails; and

    analytic computing means for receiving the measurement data transmitted from the measuring means and for databasing and graphically displaying the received measurement data for time-synchronous data analysis.

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