This document describes an IOT-based system for monitoring faults in three-phase power transmission lines. The system uses sensors to detect faults such as line-to-line faults, overloads, over voltages and under voltages, and frequency errors. When a fault is detected, the system automatically sends SMS alerts to technicians with information about the fault type and location. This allows faults to be identified and repaired more quickly, improving power reliability and reducing equipment damage. The system was found to accurately detect and classify different fault types in real-time testing.