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Current-transformer arrangement for an electrostatic meter

  • US 4,894,610 A
  • Filed: 06/12/1987
  • Issued: 01/16/1990
  • Est. Priority Date: 09/14/1985
  • Status: Expired due to Fees
First Claim
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1. A transformer arrangement for use in a static electricity meter comprising:

  • a primary conductor for carrying an alternating current to be measured,a secondary winding comprising at least two identical coils arranged in series and having axes oriented parallel to each other, andintegration means connected to the output of said secondary winding to produce a frequency independent output signal,wherein said conductor carrying said current to be measured is formed to include at least one loop to generate maximum magnetic field strength,wherein at least one of the coils of the secondary winding is arranged as closely as possible to said loop for maximum magnetic coupling without the use of any magnetic material and so as to engage as completely as possible the magnetic flux that is generated by the loop,wherein the coils of the secondary winding extend in their axial direction over an as small as possible partial length of the magnetic field lines generated by said current in said primary conductor so that no closed integration path is formed by the secondary winding; and

    wherein said coils of said secondary winding are arranged astatically and as close to each other as possible for optimum external magnetic field compensation.

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