Electric Power ›› 2021, Vol. 54 ›› Issue (5): 139-147,165.DOI: 10.11930/j.issn.1004-9649.202002133

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Optimization of Magnetic Coupling Mechanism for Wireless Power Supply of High-Voltage Transmission Line On-Line Monitoring Equipment

HE Jiyong1, ZHOU Haikuo2, ZHU Renxun2   

  1. 1. Yunnan Power Grid Co., Ltd. Lijiang Power Supply Bureau, Lijiang 674100, China;
    2. College of Electrical Engineering, Wuhan University, Wuhan 430072, China
  • Received:2020-02-26 Revised:2020-04-24 Published:2021-05-05
  • Supported by:
    This work is supported by the National Natural Science Foundation of China (Research on Wireless Power Supply Theory and Key Technologies of On-Line Monitoring Equipment for High-Voltage Transmission Lines Based on Resonant Magnetic Coupling, No.51507114)

Abstract: Real-time and accurate on-line monitoring of high-voltage transmission lines is an effective means to ensure the stable operation of power grids. Magnetic coupling resonance wireless power supply is a feasible solution to the power supply problem of on-line monitoring equipment. However, the conventional magnetic coupling resonance system has a poor overall performance due to its weak coupling and the sensitiveness of its transmission efficiency to the change of the transmission distance. The mutual inductance influences of coupling coils on the transmission efficiency are analyzed through magnetic coupling resonance circuit models, and a joint optimization scheme considering the cross influence of coils and cores is proposed to improve the transmission performance. Simulation and experiment have verified the improvement of transmission efficiency under the change of coaxial spacing, horizontal and angular offsets. This study can provide an efficient insight into the optimization of magnetic coupling system.

Key words: transmission line, magnetic coupling resonance, mutual inductance, transmission efficiency, coil with magnetic core, joint optimization