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Current Measurement of Three-Core Cables via Magnetic Sensors

Author

Listed:
  • 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)

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.

Suggested Citation

  • Jingang Su & Peng Zhang & Xingwang Huang & Xianhai Pang & Xun Diao & Yan Li, 2024. "Current Measurement of Three-Core Cables via Magnetic Sensors," Energies, MDPI, vol. 17(16), pages 1-12, August.
    • Handle: RePEc:gam:jeners:v:17:y:2024:i:16:p:4007-:d:1455427
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