Electric field induction energy acquisition has the unique advantages of stable power supply and simple engineering. It is a potential power supply mode for on-line monitoring devices of overhead transmission lines. The key to the development of the technology is how to get enough power. In order to provide a safe and stable power supply for low power on-line monitoring sensors of transmission lines

we investigated the technology of electric field induction energy acquisition. The equivalent impedance of the load was increased by using the impedance transformation characteristics of the transformer

and the secondary side of the transformer was connected in parallel to compensate the capacitance

so that the load could obtain greater power. The principle of the electric field induction power supply technology was introduced in detail

and the influencing factors

such as wire erection mode

installation position of metal plate

and capacitance compensation characteristics

were analyzed. Finally

the experiments were conducted. The results show that when the power supply voltage is 50 kV

the coupling capacitance is 14 pF

and the compensation capacitance is 0.86 nF

a 225 mW power will be obtained under the load of 1 kΩ. The experimental results are consistent with the theoretical analysis

which verifies the effectiveness of the electric field induction power supply technology.