ABSTRACT: Three-phase induction motors are widely used in industrial applications but are highly vulnerable to faults such as phase failure and excessive temperature rise, which can lead to severe damage and reduced operational life. This paper presents the design and implementation of a microcontroller-based protection system using PIC16F72 to detect and prevent such faults. The system continuously monitors phase conditions using voltage sensing circuits and measures motor temperature using an LM35 sensor. Upon detecting abnormal conditions such as phase loss or overheating, the system automatically disconnects the motor supply using a relay mechanism. The proposed system provides real-time monitoring, fast response, and improved reliability, making it suitable for industrial motor protection applications.
The microcontroller processes these inputs and triggers a relay mechanism to disconnect the motor supply whenever abnormal conditions are detected. The proposed system ensures fast response, improved reliability, and reduced maintenance costs. The design is simple, cost-effective, and suitable for small and medium-scale industrial applications

Keywords: Three-Phase Induction Motor, PIC16F72 Microcontroller, Phase Failure Detection, Temperature Monitoring, Motor Protection System, Relay Control, LM35 Sensor

Downloads: | DOI: 10.17148/IARJSET.2026.13510