Time-Multiplexed Self-Powered Wireless Current Sensor for Power Transmission Lines

Hao Chen, Zhongnan Qian, Chengyin Liu, Jiande Wu, Wuhua Li and Xiangning He
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Hao Chen: College of Electrical Engineering, Zhejiang University, Hangzhou 310027, China
Zhongnan Qian: College of Electrical Engineering, Zhejiang University, Hangzhou 310027, China
Chengyin Liu: College of Electrical Engineering, Zhejiang University, Hangzhou 310027, China
Jiande Wu: College of Electrical Engineering, Zhejiang University, Hangzhou 310027, China
Wuhua Li: College of Electrical Engineering, Zhejiang University, Hangzhou 310027, China
Xiangning He: College of Electrical Engineering, Zhejiang University, Hangzhou 310027, China

Energies, 2021, vol. 14, issue 6, 1-15

Abstract: Current measurement is a key part of the monitoring system for power transmission lines. Compared with the conventional current sensor, the distributed, self-powered and contactless current sensor has great advantages of safety and reliability. By integrating the current sensing function and the energy harvesting function of current transformer (CT), a time-multiplexed self-powered wireless sensor that can measure the power transmission line current is presented in this paper. Two operating modes of CT, including current sensing mode and energy harvesting mode, are analyzed in detail. Through the design of mode-switching circuit, harvesting circuit and measurement circuit are isolated using only one CT secondary coil, which eliminates the interference between energy harvesting and current measurement. Thus, the accurate measurement in the current sensing mode and the maximum energy collection in the energy harvesting mode are both realized, all of which simplify the online power transmission line monitoring. The designed time-multiplexed working mode allows the sensor to work at a lower transmission line current, at the expense of a lower working frequency. Finally, the proposed sensor is verified by experiments.

Keywords: time-multiplexed; self-powered; current transformer; current sensor (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2021
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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