Time-Multiplexed Self-Powered Wireless Current Sensor for Power Transmission Lines

Current measurement is a key part of the monitoring system for power transmission lines. Compared with conventional current sensor, distributed, self-powered and contactless sensor has great advantages safety reliability. By integrating sensing function energy harvesting transformer (CT), time-multiplexed wireless that can measure line presented in this paper. Two operating modes CT, including mode mode, are analyzed detail. Through design mode-switching circuit, circuit isolated using only one CT secondary coil, which eliminates interference between measurement. Thus, accurate maximum collection both realized, all simplify online monitoring. The designed working allows to work at lower current, expense frequency. Finally, proposed verified by experiments.