Resonant Wireless Charging System Design for 110-kV High-Voltage Transmission Line Monitoring Equipment

A novel high-voltage operation featured wireless power transfer system for monitoring equipment charging on a 110-kV high-voltage transmission line based on magnetic resonant coupling is studied and designed in this paper. With consideration of operation environment on transmission line and electrical transmission tower, an overall scheme is proposed through installation position, coupling structure, and driving topology design. In order to improve the system's suitability in high-voltage environment, related optimization methods including constraining power flow path, improving quality factor, and coupling have been adopted. Since the coupling coils are fixed at both ends of an insulator string, a barrel-shaped high-permeability material layer is added to constrain the magnetic field distribution. Moreover, cross impacts between transmission line and the charging system are analyzed. The influence of a power frequency magnetic field on the charging system is calculated and electric distribution of the insulator string with the charging system is simulated. Analysis results indicate that cross impacts can be negligible. Experimental results verify that the transmission power can meet power supply requirements and the designed charging system can be operated stably under the high-voltage condition.