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Novel Application of Magnetoresistive Sensors for High-Voltage Transmission-Line Monitoring

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7 Author(s)
Sun, X. ; Dept. of Electr. & Electron. Eng., Univ. of Hong Kong, Hong Kong, China ; Lui, K.S. ; Wong, K.K.Y. ; Lee, W.K.
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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.

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Magnetics, IEEE Transactions on  (Volume:47 ,  Issue: 10 )