Energies (Aug 2024)

Current Measurement of Three-Core Cables via Magnetic Sensors

  • Jingang Su,
  • Peng Zhang,
  • Xingwang Huang,
  • Xianhai Pang,
  • Xun Diao,
  • Yan Li

DOI
https://doi.org/10.3390/en17164007
Journal volume & issue
Vol. 17, no. 16
p. 4007

Abstract

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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