Sensors 2012, 12(11), 15520-15541; doi:10.3390/s121115520
Article

A Current Sensor Based on the Giant Magnetoresistance Effect: Design and Potential Smart Grid Applications

1 State Key Lab of Power Systems, Department of Electrical Engineering, Tsinghua University, Beijing 100084, China 2 Center for Magnetic Nanotechnology, Stanford University, 450 Serra Mall, Stanford, CA 94305, USA
* Author to whom correspondence should be addressed.
Received: 27 September 2012; in revised form: 29 October 2012 / Accepted: 30 October 2012 / Published: 9 November 2012
(This article belongs to the Section Physical Sensors)
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Abstract: Advanced sensing and measurement techniques are key technologies to realize a smart grid. The giant magnetoresistance (GMR) effect has revolutionized the fields of data storage and magnetic measurement. In this work, a design of a GMR current sensor based on a commercial analog GMR chip for applications in a smart grid is presented and discussed. Static, dynamic and thermal properties of the sensor were characterized. The characterizations showed that in the operation range from 0 to ±5 A, the sensor had a sensitivity of 28 mV·A−1, linearity of 99.97%, maximum deviation of 2.717%, frequency response of −1.5 dB at 10 kHz current measurement, and maximum change of the amplitude response of 0.0335%·°C−1 with thermal compensation. In the distributed real-time measurement and monitoring of a smart grid system, the GMR current sensor shows excellent performance and is cost effective, making it suitable for applications such as steady-state and transient-state monitoring. With the advantages of having a high sensitivity, high linearity, small volume, low cost, and simple structure, the GMR current sensor is promising for the measurement and monitoring of smart grids.
Keywords: current sensing; giant magnetoresistance; sensor design; smart grid

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MDPI and ACS Style

Ouyang, Y.; He, J.; Hu, J.; Wang, S.X. A Current Sensor Based on the Giant Magnetoresistance Effect: Design and Potential Smart Grid Applications. Sensors 2012, 12, 15520-15541.

AMA Style

Ouyang Y, He J, Hu J, Wang SX. A Current Sensor Based on the Giant Magnetoresistance Effect: Design and Potential Smart Grid Applications. Sensors. 2012; 12(11):15520-15541.

Chicago/Turabian Style

Ouyang, Yong; He, Jinliang; Hu, Jun; Wang, Shan X. 2012. "A Current Sensor Based on the Giant Magnetoresistance Effect: Design and Potential Smart Grid Applications." Sensors 12, no. 11: 15520-15541.

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