Importance

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Abstract

The invention is concerned with a current-transformer arrangement for a static electricity meter, including a primary conductor carrying the alternating current to be measured and a secondary winding consisting of at least two coils connected in series, the output voltage from which is passed to an electronic integrating stage to produce a measuring signal independent of frequency. The current-transformer arrangement of the invention is characterized in that the primary conductor is formed into a loop to produce maximal field strength, the secondary winding is designed astatically with electrically identical coils and, in order to produce maximal magnetic coupling, at least one of the secondary coils, in the absence ferromagnetic materials, takes up with the primary conductor, as completely as possible, the magnetic flux of the current flowing in the primary conductor, such secondary coil extending axially over the smallest possible partial length of the magnetic flux lines produced by the current in the primary conductor. External magnetic interference fields therefore have practically no effect upon the transmission of measured values.

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First Claim