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US 7,746,068 B2Granted
Method and apparatus for measuring current
AssigneeLem Heme Limited
InventorJames Stephen Mahon
Life of this patent
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AssigneeLem Heme Limited
InventorJames Stephen Mahon
Estimating the term…
Current testing/measuring apparatus 10 comprises a flexible member 12 having a first end 14 and a second end 16. In use, the flexible member 12 is arranged to locate around a conductor 11 carrying a current to be measured. In particular, the current measuring apparatus 10 comprises a Rogowski coil. The ends of the flexible member 12 are coupled together in use but a gap is created between the ends. This distance can generate errors in the current measurement and the present invention provides compensation means 28 in the form of a compensation windings. The compensation windings comprise a planar spiral conductor provided on a printed circuit board to compensate for the separation distance between the first end and the second end.
Compensation means for current measuring apparatus wherein the compensation means comprises a conductor in which the conductor is arranged to wind around a fixed point wherein the distance from a first point on the conductor to the fixed point is greater than the distance from a second point on the conductor to the fixed point and wherein the current measuring apparatus comprises a flexible member having a first end and a second end, in which, in use, the first end is arranged to locate adjacent to the second end.
Dependencies are inferred from the claim text.