Device for measuring temperature using a Rogowski coil
First Claim
1. Device for measuring temperature using a Rogowski coil of the type having a winding and comprising at least one printed circuit plate provided with a circular cutout, the coil being implemented by metal deposits on each of the two faces of the plate and extending along radii such that geometrical projections thereof pass through the center of said cutout, electrical connections between the radii on one face and those on the opposite face being implemented by plated-through holes that pass through the thickness of the plate, the winding comprising an outward leg and a return leg around the cutout with an input and an output on the same face of the plate, separated by a distance of a few tenths of a millimeter, in which said Rogowski coil has an ohmic resistance r and constitutes one of the branches of a Wheatstone bridge comprising three other resistors r2, r3 and r4, one diagonal of said bridge being connected to a voltage U, the voltage e measured across the other diagonal being related to the temperature θ
- by the equation;
space="preserve" listing-type="equation">e=U A/Bwhere;
A=((r.r40 (1+α
θ
)-r20.r30 (1+2α
θ
)), andB=((r+r20 (1+α
θ
)).((r30 (1+α
θ
).r40 (1+α
θ
)), andr20, r30 and r40 are the respective ohmic resistance values of said resistors r2, r3 and r4, α
denoting the common temperature coefficient of said resistors.
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Accused Products
Abstract
A Rogowski coil is used as a precise current and temperature measuring device (in particular a device that is highly insensitive to temperature variations). The Rogowski coil is of the type including at least one printed circuit plate provided with a circular cutout. The coil is implemented by metal deposits on each of the two faces of the plate and extending along radii such that geometrical projections thereof pass through the center of the cutout. Electrical connections between the radii on one face and those on the opposite face are implemented by plated-through holes that pass through the thickness of the plate.
49 Citations
1 Claim
-
1. Device for measuring temperature using a Rogowski coil of the type having a winding and comprising at least one printed circuit plate provided with a circular cutout, the coil being implemented by metal deposits on each of the two faces of the plate and extending along radii such that geometrical projections thereof pass through the center of said cutout, electrical connections between the radii on one face and those on the opposite face being implemented by plated-through holes that pass through the thickness of the plate, the winding comprising an outward leg and a return leg around the cutout with an input and an output on the same face of the plate, separated by a distance of a few tenths of a millimeter, in which said Rogowski coil has an ohmic resistance r and constitutes one of the branches of a Wheatstone bridge comprising three other resistors r2, r3 and r4, one diagonal of said bridge being connected to a voltage U, the voltage e measured across the other diagonal being related to the temperature θ
- by the equation;
space="preserve" listing-type="equation">e=U A/Bwhere; A=((r.r40 (1+α
θ
)-r20.r30 (1+2α
θ
)), andB=((r+r20 (1+α
θ
)).((r30 (1+α
θ
).r40 (1+α
θ
)), andr20, r30 and r40 are the respective ohmic resistance values of said resistors r2, r3 and r4, α
denoting the common temperature coefficient of said resistors.
- by the equation;
Specification
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- Resources
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Current AssigneeAreva T&D SAS (GE Aerospace)
-
Original AssigneeGEC Alsthom T&D SA
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InventorsBaudart, Christophe
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Primary Examiner(s)Nguyen, Vinh P.
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Application NumberUS08/329,849Time in Patent Office362 DaysField of Search324/127, 324/126, 324/117 R, 324/105, 336/92, 336/84, 374/114, 374/100, 374/132, 374/172US Class Current324/127CPC Class CodesG01K 7/36 using magnetic elements, e....G01R 19/32 Compensating for temperatur...
