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US 9,285,398 B2Granted
Systems and methods for shielding current transducers
AssigneeGeneral Electric Company
InventorDan Tho Lu
Life of this patent
Estimating the term…
Abstract
A shield for protecting a current transducer from noise may include a first annular ring that may be disposed adjacent to a first side of a current sensor. The shield may also include a second annular ring that may be disposed adjacent to a second side of the current sensor opposite the first side, such that the first and second annular rings each include magnetically permeable material.
Claims17
A shield, comprising:
- a first annular ring configured to be disposed adjacent to a first side of a current sensor;
- a second annular ring configured to be disposed adjacent to a second side of the current sensor opposite the first side, wherein the first and second annular rings each comprise a magnetically permeable material;
- a third annular ring configured to be disposed adjacent to a third side of the current sensor;
- and
- a fourth annular ring configured to be disposed adjacent to a fourth side of the current sensor opposite the third side, wherein the first and second annular rings are axially spaced apart from one another, and the third and fourth annular rings are radially spaced apart from one another, and wherein a distance between an inner radius and an outer radius of the first annular ring and the second annular ring is approximately equal to or greater than a sum of a thickness of the third annular ring, a thickness of the current sensor, and a thickness of the fourth annular ring.
2 more elements
A system, comprising:
- a housing having a first cavity and a second cavity;
- a current sensor disposed in the first cavity;
- a calibration circuit disposed in the second cavity, wherein the calibration circuit is configured to adjust phase and sensitivity properties of a measurement output by the current sensor;
- and
- a set of shields disposed within the first cavity of the housing about the current sensor, wherein the set of shields comprises first and second shields disposed on axially opposite sides of the current sensor, and third and fourth shields disposed on radially opposite sides of the current sensor, wherein each of the set of shields comprises magnetically permeable material, and wherein the housing is configured to enclose the set of shields.
2 more elements
A method, comprising:
- absorbing at least one of electrical and magnetic interference with a set of shields disposed about a current sensor, wherein the set of shields comprises:
- first and second shields disposed on axially opposite sides of the current sensor;
- third and fourth shields disposed on radially opposite sides of the current sensor, wherein each of the set of shields comprises magnetically permeable material;
- and
- calibrating the current sensor via a calibration circuit disposed within a housing configured to enclose the set of shields by adjusting phase and sensitivity properties of a current measurement output by the current sensor.
2 more elements
Dependencies are inferred from the claim text.