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Sensors 2017, 17(4), 820;

Design and Experimental Study of a Current Transformer with a Stacked PCB Based on B-Dot

State Key Laboratory of Power Transmission Equipment and System Security and New Technology, Chongqing University, Chongqing 400044, China
Chongying Electric Power Design Institute, Chongying 401121, China
Author to whom correspondence should be addressed.
Received: 15 January 2017 / Revised: 28 March 2017 / Accepted: 29 March 2017 / Published: 10 April 2017
(This article belongs to the Section Physical Sensors)
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An electronic current transformer with a B-dot sensor is proposed in this study. The B-dot sensor can realize the current measurement of the transmission line in a non-contact way in accordance with the principle of magnetic field coupling. The multiple electrodes series-opposing structure is applied together with differential input structures and active integrating circuits, which can allow the sensor to operate in differential mode. Maxwell software is adopted to model and simulate the sensor. Optimization of the sensor structural parameters is conducted through finite-element simulation. A test platform is built to conduct the steady-state characteristic, on-off operation, and linearity tests for the designed current transformer under the power-frequency current. As shown by the test results, in contrast with traditional electromagnetic CT, the designed current transformer can achieve high accuracy and good phase-frequency; its linearity is also very good at different distances from the wire. The proposed current transformer provides a new method for electricity larceny prevention and on-line monitoring of the power grid in an electric system, thereby satisfying the development demands of the smart power grid. View Full-Text
Keywords: non-contact; magnetic field coupling; current transformer; current monitoring non-contact; magnetic field coupling; current transformer; current monitoring

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Wang, J.; Si, D.; Tian, T.; Ren, R. Design and Experimental Study of a Current Transformer with a Stacked PCB Based on B-Dot. Sensors 2017, 17, 820.

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