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Power network monitoring devices play a key role in maintaining the health and safety of power networks, so it is important to realize the sustained power supply to the monitoring devices. In this paper, a non-contact self-powered device with electrode-capacitor-electrode (ECE) structure is proposed, which can capture and store the energy of the AC electric field around the high-voltage line, so as to store the electric energy in the capacitor. It is expected to realize the continuous independent power supply to the power grid monitoring equipment. It is demonstrated that when the transmission line voltage is 7kV, the output voltage of the ECE pole plate is up to more than 600V, and 48 LEDs can be lit. For a capacitor with a capacity of 50mF, it only takes about 30 minutes to charge 15V from 5V, and can continuously output a 5 V and 50mA power for about 16 seconds. In addition, it is further found that the output voltage of the rectifier bridge increases as the parallel resistance increases, which makes it possible to effectively control the charging time by controlling the size of the resistance. The proposed self-powered device with electrode-capacitor-electrode structure provides a new energy power supply strategy for grid monitoring devices, which is expected to play an important role in enhancing the stability and reliability of power systems.
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