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Cable condition analyzing system for electric arc furnace conductors

  • US 4,283,678 A
  • Filed: 06/05/1978
  • Issued: 08/11/1981
  • Est. Priority Date: 06/05/1978
  • Status: Expired due to Term
First Claim
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1. For use with electric arc furnaces or the like usually provided with multiple phase electrical power and having for each phase plural electrical cables that ordinarily conduct relatively large electrical currents and encounter current fluctuations during operation, a system for sensing current flow for use in analyzing the condition of all of such electrical cables serving a respective phase, comprising input means for simultaneously producing a plurality of representative electrical signals indicative, respectively, of the electrical currents carried by such plurality of cables, said input means comprising a separate input means for each of the cables being monitored by the system and each input means including a respective transducer that produces an output voltage representative of the change of current flowing through a monitored cable with respect to time and means for producing such representative electrical signals from such output voltages, timed means including a plurality of timed integrator means for respectively integrating simultaneously each of said representative electrical signals for a period of time to produce respective integrated signals, said timed integrator means comprising a separate one of the same for each of the cables analyzed by the system, each including an integrator circuit and timer means for delivering to said integrator circuit for a selected period of time said representative electrical signal for integration by said integrator circuit, means for coupling each integrator circuit to said input means, memory means for storing a plurality of stored signals, each being indicative of a respective integrated signal, means for coupling said memory means to said integrator circuits, and means for making a comparison between at least one of said stored signals representing the electrical signal carried by at least one such cable at a given time and at least another one of said stored signals representing the electrical signal carried by at least another such cable at the same time, said means for making a comparison including read-out means selectively operable for producing output information respresentative of said stored signals, and display means for displaying the output from said read-out means.

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