Development of Transformer Monitoring Device using IoT technology for Condition Based Maintenance

This paper comprehensively reports on the transformer monitoring device used within the CBM framework, covering its development concept, monitoring parameters, implementation cases, and future development directions. This device utilises IoT technology and can be installed on existing equipment without modification or planned power outages. Furthermore, its low-cost and highly versatile configuration facilitates widespread implementation.

It demonstrates the effectiveness of transformer condition monitoring using this device and discusses its applications based on actual acquired data, including feasibility studies for online

DGA (Dissolved Gas Analysis), LTC (Load Tap Changer) operation monitoring, oil leakage monitoring at the top of the transformer, and dynamic rating. Hydrogen concentration monitoring via online DGA involved analysing numerous acquired data points, establishing correlations with existing offline DGA results. LTC operation monitoring and oil leak detection achieved high flexibility without requiring modifications to existing equipment by employing camera-based image acquisition.

Furthermore, it demonstrates potential for future functional expansion through AI (Artificial

Intelligence) -based automatic diagnostics and image analysis. In the study of application to dynamic rating, real-time acquisition and accumulation of data such as ambient temperature, oil temperature, and load current enabled analysis of load fluctuations because of weather conditions and changes in oil temperature. This demonstrated the potential for real-time evaluation of transformer operating conditions. These technologies eliminate the need for modifications to existing equipment, delivering high flexibility. They also hold potential for future functional expansion through AI-powered automatic diagnostics and image analysis. These achievements significantly contribute to enhancing the maintenance and operational efficiency of substation equipment.