Optimization Design of Self-powered Coil for Wireless Sensor of Three Core Cable Based on Spatial Electromagnetic Energy

The energy of the cable status monitoring system comes from the self-powered coil of system sensor, and the energy harvesting efficiency of this coil will directly determine the operation of cable status monitoring system. Considering that the failure of traditional self-powered coil caused by uneven spatial magnetic field distribution in three core cables, this paper based on the idea of spatial electromagnetic energy conversion, and proposed a simplified calculation model for spatial magnetic field distribution in three core cables, to guide the optimization design of self-powered coil in cable sensors. Firstly, according to the structural characteristics of three core cable, a simplified calculation model of cable space magnetic field is proposed, and the magnetic field at any position in the space around the cable is solved based on the basic Electromagnetism theories such as Ampere’s Law, and then the output voltage of self-powered coil is derived; Then, based on the above model and theory, the magnetic field distribution of the three core cable and the output voltage of self-powered coil were analyzed, thereby achieving the optimization design of the self-powered coil for three core cable.