A Self-powered Wireless Sensor System for Monitoring the Deformation of Gas Insulated Switchgear Expansion Joint

This work reports on the design and implementation of a self-powered wireless GIS expansion joint deformation monitoring system based on extremely low amplitude stray magnetic field energy harvester. A prototype of the wireless deformation monitoring system that can be powered by energy harvesting technology is designed, fabricated, and characterized. A cantilever beam-type stray magnetic field energy harvester (MEH) based on the magnetomechano-electric coupling effect is designed for harvesting stray magnetic field energy from the environment around the GIS expansion joint. The proposed MEH device is capable of generating an open-circuit output peak-to-peak voltage of 4.24 V and a power of 113.1 μW in a magnetic field environment of 50 μT. The system is of great significance to improve the safe operation of the power system and meets the technical requirements of building passive wireless Internet of Things (IoT).