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Non-Contact Current Measurement Method Based on Field-Source Inversion for DC Rectangular Busbars

Qishuai Liang (), Zhongchen Xia, Jiang Ye, Yufeng Wu, Jie Li, Zhao Zhang, Xiaohu Liu () and Shisong Li
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Qishuai Liang: Power Transmission Operation & Maintenance Branch Hainan Power Grid Co., Ltd., Haikou 570100, China
Zhongchen Xia: Power Transmission Operation & Maintenance Branch Hainan Power Grid Co., Ltd., Haikou 570100, China
Jiang Ye: Power Transmission Operation & Maintenance Branch Hainan Power Grid Co., Ltd., Haikou 570100, China
Yufeng Wu: Power Transmission Operation & Maintenance Branch Hainan Power Grid Co., Ltd., Haikou 570100, China
Jie Li: Power Transmission Operation & Maintenance Branch Hainan Power Grid Co., Ltd., Haikou 570100, China
Zhao Zhang: Power Transmission Operation & Maintenance Branch Hainan Power Grid Co., Ltd., Haikou 570100, China
Xiaohu Liu: Department of Electrical Engineering, Tsinghua University, Beijing 100084, China
Shisong Li: Department of Electrical Engineering, Tsinghua University, Beijing 100084, China

Energies, 2025, vol. 18, issue 14, 1-17

Abstract: With the widespread application of DC technology in data centers, renewable energy, electric transportation, and high-voltage direct current (HVDC) transmission, DC rectangular busbars are becoming increasingly important in power transmission systems due to their high current density and compact structure. However, space constraints make the deployment of conventional sensors challenging, highlighting the urgent need for miniaturized, non-contact current measurement technologies to meet the integration requirements of smart distribution systems. This paper proposes a field-source inversion-based contactless DC measurement method for rectangular busbars. The mathematical model of the magnetic field near the surface of the DC rectangular busbar is first established, incorporating the busbar eccentricity, rotation, and geomagnetic interference into the model framework. Subsequently, a magnetic field–current inversion model is constructed, and the DC measurement of the rectangular busbar is achieved by performing an inverse calculation. The effectiveness of the proposed method is validated by both simulation studies and physical experiments.

Keywords: field-source inversion; contactless current measurement; DC rectangular busbar; geomagnetic interference; busbar eccentricity and rotation (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: 2025
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