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Sensors 2015, 15(8), 20678-20697; doi:10.3390/s150820678

Research and Experiments on a Unipolar Capacitive Voltage Sensor

1
State Key Laboratory of Power Transmission Equipment & System Security and New Technology, Chongqing University, Chongqing 400044, China
2
State Grid Chongqing Electric Power Co. Electric Power Research Institute, Chongqing 400015, China
*
Author to whom correspondence should be addressed.
Academic Editor: Vittorio M. N. Passaro
Received: 9 June 2015 / Revised: 27 July 2015 / Accepted: 12 August 2015 / Published: 21 August 2015
(This article belongs to the Section Physical Sensors)

Abstract

Voltage sensors are an important part of the electric system. In service, traditional voltage sensors need to directly contact a high-voltage charged body. Sensors involve a large volume, complex insulation structures, and high design costs. Typically an iron core structure is adopted. As a result, ferromagnetic resonance can occur easily during practical application. Moreover, owing to the multilevel capacitor divider, the sensor cannot reflect the changes of measured voltage in time. Based on the electric field coupling principle, this paper designs a new voltage sensor; the unipolar structure design solves many problems of traditional voltage sensors like the great insulation design difficulty and high costs caused by grounding electrodes. A differential signal input structure is adopted for the detection circuit, which effectively restrains the influence of the common-mode interference signal. Through sensor modeling, simulation and calculations, the structural design of the sensor electrode was optimized, miniaturization of the sensor was realized, the voltage division ratio of the sensor was enhanced, and the phase difference of sensor measurement was weakened. The voltage sensor is applied to a single-phase voltage class line of 10 kV for testing. According to the test results, the designed sensor is able to meet the requirements of accurate and real-time measurement for voltage of the charged conductor as well as to provide a new method for electricity larceny prevention and on-line monitoring of the power grid in an electric system. Therefore, it can satisfy the development demands of the smart power grid. View Full-Text
Keywords: voltage sensor; differential input; non-contact measurement; Ansoft Maxwell voltage sensor; differential input; non-contact measurement; Ansoft Maxwell
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Zhou, Q.; He, W.; Li, S.; Hou, X. Research and Experiments on a Unipolar Capacitive Voltage Sensor. Sensors 2015, 15, 20678-20697.

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