Abstract: Distribution transformers play a crucial function in electric strength structures and their failure can lead to strength interruption and high upkeep prices continuous tracking of transformer fitness parameters is important to prevent sudden faults and enhance system reliability this task presents an iot-based transformer health monitoring machine that permits real-time remark of crucial parameters together with transformer temperature and oil stage the proposed machine makes use of a nodemcu esp8266 microcontroller to gather information from a temperature sensor and an ultrasonic sensor used for oil level monitoring the sensed statistics is displayed domestically on an lcd show and simultaneously transmitted to a cloud platform using wi-fi for faraway tracking when odd situations are detected an alert buzzer is activated and a cooling fan is robotically grew to become on to protect the transformer from harm the developed device reduces the want for guide inspection lets in early fault detection and gives a cost-powerful and green solution for transformer health monitoring the use of internet of things generation.

Keywords: IoT, Transformer Health Monitoring, NodeMCU ESP8266, DHT11 Temperature Sensor, Ultrasonic Sensor, Cloud Computing, Embedded Systems, Real-Time Monitoring.

Downloads: | DOI: 10.17148/IARJSET.2026.13318