In order to achieve the stable and uninterrupted power supply of intelligent monitoring instruments for high voltage transmission lines

an energy transmission structure of composite insulators with embedded coils was established based on the wireless power supply system for intelligent monitoring instruments. According to the characteristics of fabrication process of composite insulator and printed circuit board（PCB）

a PCB coil board which can be embedded in the insulator was designed

and its embedding characteristics and high voltage insulation performance were verified. On this basis

through mathematical derivation and experimental analysis

the PCB coil board was optimized based on hollow factor and gradual line width. Finally

the design of 110 kV composite insulator energy transmission structure was completed

and experiments were performed to verify its ability. The results show that this new type of composite insulator meets the requirements of high voltage insulation

and can realize the wireless power transmission with distance of 1.13 m. The proposed structure is convenient for production and installation

which can provide a feasible scheme for the design of power supply system of intelligent monitoring instruments.