Monitoring and Early Warning System for Bolt Looseness of the Electric Power Tower Based on Capacitance Sensor and LoRa Network

In order to solve the problem of the electric power tower collapsed caused by bolt loosening, a monitoring and early warning system for bolt loosening of the electric power tower based on LoRa network is designed in this manuscript. A non-contact measurement method and height-dividing area management for bolt is used, and its rationality is verified by simulation with Ansoft Maxwell or experiment. The results show that the capacitance of the bolt looseness test module can change obviously when the bolt or nut rotates 10 degrees, and the error of the height measurement module is 6.4%. The LoRa network can realize remote monitoring, so a monitoring system designed can meet the requirements of remote on-line monitoring of bolts to reduce accidents by bolt looseness.