Current Measurement of Three-Core Cables via Magnetic Sensors

Jingang Su (), Peng Zhang, Xingwang Huang, Xianhai Pang, Xun Diao and Yan Li
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Jingang Su: Electric Power Research Institute, State Grid Hebei Electric Power Supply Co., Ltd., Shijiazhuang 050021, China
Peng Zhang: Electric Power Research Institute, State Grid Hebei Electric Power Supply Co., Ltd., Shijiazhuang 050021, China
Xingwang Huang: Electric Power Research Institute, State Grid Hebei Electric Power Supply Co., Ltd., Shijiazhuang 050021, China
Xianhai Pang: Electric Power Research Institute, State Grid Hebei Electric Power Supply Co., Ltd., Shijiazhuang 050021, China
Xun Diao: Department of Electrical Engineering, North China Electric Power University (Baoding), Baoding 071003, China
Yan Li: Department of Electrical Engineering, North China Electric Power University (Baoding), Baoding 071003, China

Energies, 2024, vol. 17, issue 16, 1-12

Abstract: Due to their compact structure and low laying cost, three-core power cables are widely used for power distribution networks. The three-phases of such cables are distributed symmetrically with a 120° shift to each other. Phase current is an important parameter to reflect the operation state of the power system and three-core cable. Three-core symmetrical power cables use a common shield, leading to magnetic field cancelation outside the cable during steady operation. Thus, traditional magnetic-based current transformers cannot measure the phase current on three-core cable non-invasively. In order to measure the phase current more conveniently, a phase current measurement method for three-core cables based on a magnetic sensor is proposed in this paper. Nonlinear equations of a phase current and the magnetic field of a measuring point are constructed. The calculated magnetic field distribution of the three-core cable is verified using a finite element simulation. The effectiveness of the measurement method is further validated through experiments. This proposed method is able to conveniently detect the phase current of three-core power cables, which can help cable maintenance.

Keywords: three-core cable; current measurement; magnetic sensor; phase current (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: 2024
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