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Method and apparatus for accurate measurement of pulsed electric currents utilizing ordinary current transformers

  • US 6,479,976 B1
  • Filed: 06/28/2001
  • Issued: 11/12/2002
  • Est. Priority Date: 06/28/2001
  • Status: Expired due to Fees
First Claim
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1. A method for continuously providing a secondary electric current that is approximately proportional to a primary electric current;

  • said primary electric current periodically having a magnitude of approximately zero amps for nonzero periods of time;

    said primary electric current flowing in a conductor configured as a primary winding of a current transformer, said secondary electric current flowing in a secondary winding of said current transformer;

    said primary winding and said secondary winding being magnetically coupled;

    a controllable voltage device being connected in series with said secondary winding;

    said voltage device producing an output voltage affecting the rate that magnetic flux builds up within said current transformer;

    the build-up of said magnetic flux in said current transformer being associated with a secondary electric current error;

    said method comprising controlling said voltage device so that (a) whenever the magnitude of said secondary electric current is greater than a predetermined value said output voltage reduces the rate that said magnetic flux builds up in said current transformer; and

    (b) whenever the magnitude of said secondary electric current is less than said predetermined value said output voltage is controlled so that said secondary electric current error decays while the magnitude of said primary current is approximately zero amps.

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