Current-transformer arrangement for an electrostatic meter
First Claim
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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Accused Products
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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Citations
14 Claims
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1. A transformer arrangement for use in a static electricity meter comprising:
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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, and integration 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. - View Dependent Claims (2, 3, 4)
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5. A transformer arrangement for use in a static electricity meter comprising:
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a primary conductor for carrying an alternating current to be measured, a secondary winding comprising at least two identical astatic coils arranged in series, and integration 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; wherein said coils of said secondary winding are arranged as close to each other as possible for optimum external magnetic field compensation, and wherein said primary conductor is a flat conductor and said loop comprises opposed conductor sections each having at least one recess to form a primary winding with a winding area substantially parallel with the plane of the flat conductor, and wherein the coils of said secondary winding are substantially parallel to said flat conductor and are traversed, at least partially, by the primary magnetic flux running substantially at right angles to the plane of the flat conductor. - View Dependent Claims (6, 7, 8, 9, 10, 11)
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12. A current transformer arrangement for a static electricity meter comprising
a primary conductor carrying an alternating current to be measured, a secondary winding including at least two identical astatic coils connected in series, the output of which is passed to an electronic integrating stage to produce a frequency independent signal, wherein said primary conductor is formed as a loop to produce maximal field strength, wherein at least one of said coils of said secondary winding, in the absence of ferromagnetic materials, takes up with the primary conductor, as completely as possible, the magnetic flux of the current flowing in the primary conductor, said one coil extending axially over the smallest possible partial length of the magnetic flux lines produced by the current in the primary conductor, wherein the primary conductor is formed as a flat conductor including a current loop comprising opposed conductor sections each having at least one recess, the recesses facing the conductor sections forming a primary winding with a winding area substantially parallel with the plane of the flat conductor and being traversed, at least partially, by the primary magnetic flux running substantially at right angles to the plane of said flat conductor, wherein said recesses extend approximately from the centerline to the edge of the primary conductor in opposite directions, and wherein the opposed sections of the primary conductor each comprises two recesses extending in opposite directions and staggered in parallel to form two windings lying side by side in the longitudinal direction of the primary conductor, the magnetic flux in each winding passing substantially through a coil of the secondary winding.
Specification