Abstract
In order to provide a safe and stable power supply for low-power online monitoring sensors of transmission lines, a method of harvesting space electric field energy by using the impedance conversion characteristics of the transformer and the reactive compensation characteristics of the capacitor is proposed. The method effectively solves the key problem that the power of energy harvesting based on electric field induction is limited by the transformer excitation reactance and is difficult to upgrade. In this paper, the principle of power supply technology based on electric field induction is described in detail, and the influencing factors such as the wire erection mode, polar plate installation position, and capacitance compensation characteristics are simulated and tested. The test results show that when the power supply voltage is 50 kV, the stray capacitance is 14 pF, the compensation capacitance is 0.86 nF, and the load resistance is 1 kΩ, the energy-harvesting power is 340 mW. Finally, the power supply circuit of a drive-away-birds apparatus is designed, which shows that it can provide a stable and reliable power supply for online monitoring sensors.
Highlights
A stable and reliable power supply is an indispensable part of an online monitoring sensor for transmission lines
On the basis of these findings, this paper proposes a method for harvesting space electric field the power of the load
A method of harvesting space electric field energy by using transformer impedance conversion characteristics and capacitor reactive power compensation characteristics is proposed in this paper
Summary
A stable and reliable power supply is an indispensable part of an online monitoring sensor for transmission lines. The online monitoring sensor on the tower is mainly powered by solar photovoltaic (PV) generation and batteries [1]. Solar PV generation is influenced by environmental factors. Extreme weather (strong wind and rain) will seriously affect the power supply stability and, because the battery life is limited, it is necessary to replace batteries within a certain amount of time. It is necessary to develop a stable way of energy harvesting to cooperate with solar energy for power supply. In addition to solar photovoltaic power generation, the main methods of energy harvesting are coil-based magnetic energy harvesting and electric field induction energy harvesting
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