Novel application of magnetoresistive sensors for high-voltage transmission-line monitoring

X. Sun, K. S. Lui, K. K.Y. Wong, W. K. Lee, Y. Hou, Q. Huang, P. W.T. Pong

Research output: Contribution to journalArticlepeer-review

54 Scopus citations


High-voltage transmission lines are responsible for transmission of electric power. Their sag and electric current are important parameters for transmission-line monitoring. In this paper, a simple and promising method based on magnetoresistive sensors is proposed for transmission-line monitoring. This is a noncontact method and its installation is simple without the need for power cut. The method involves measuring emanated magnetic field from a line conductor at the ground level and, then, calculating the source position and current inversely. A proof-of-concept laboratory setup was constructed and a series of experiments were carried out for demonstration. This method can handle complicated transmission-line configuration by integrating the stochastic optimization approach into the inverse electromagnetic calculation. It was tested with the computational simulation of a 500 kV transmission-line configuration. The result shows the feasibility of using this transmission-line monitoring method in reality.

Original languageEnglish (US)
Article number6027821
Pages (from-to)2608-2611
Number of pages4
JournalIEEE Transactions on Magnetics
Issue number10
StatePublished - Oct 2011
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Electrical and Electronic Engineering


  • Galloping
  • magnetoresistive (MR) sensors
  • overhead transmission lines
  • sagging
  • smart grid


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