Failures of power transformers can be caused by overheating, insulation failure, gas build-up and mechanical stress . These can result in pool fires, jet fires and boiling liquid expanding vapor explosion (BLEVE) . This will result in serious asset damage, safety risks and extended down-time. The traditional protection is based on periodic inspection and offline DGA. In this paper we propose a low cost real time monitoring and early warning approach based on the ESP32 processor. The proposed approach is to continuously acquire the oil temperature, oil level, combustible gas concentration, vibration and load current data, compare them to the three tier threshold values derived from literature on risk and consequence analysis, and trigger alarm/notification in case of fire or explosion.

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