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AC current sensor for measuring electric AC current in a conductor and an indicator system comprising such a sensor

  • US 8,421,475 B2
  • Filed: 07/06/2007
  • Issued: 04/16/2013
  • Est. Priority Date: 07/10/2006
  • Status: Expired due to Fees
First Claim
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1. An AC current sensor (22;

  • 24;

    26) for performing a substantially real time measurement of electric AC current magnitude in a conductor and for generating a non-electrical wave signal as an output, said non-electrical wave signal comprising a series of pulses having a frequency, which is proportional to the magnitude of current measured, said current sensor comprising;

    a current responsive unit comprising an inductive wire-wound current transformer (2210), adapted for mounting adjacent to said electric conductor, said inductive wire-wound current transformer (2210) providing electrical power as a driving current for said current sensor;

    a sensor circuitry (2220) comprising current level indication circuitry (2222) comprising a current-to-frequency converter adapted to provide said non-electrical wave signal as a substantially real time current level indication pulse signal (CS1) having a pulse width of 0.5 to 5 μ

    s and a pulse frequency (Pfcs) that is proportional to the magnitude of said conductor current when it is within a predetermined current interval (I1-I2); and

    said sensor circuitry (2220) further comprising a means (2230) for emitting said non-electrical wave signal as an output to a remote detector, said means (2230) further being adapted for providing at least one further non-electrical wave indication signal in form of a current polarity indication signal (POS) to the remote detector, wherein said non-electrical wave signal and at least one further non-electrical wave indication signal are provided simultaneously.

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