This document describes a proposed IOT-based system for detecting and classifying faults on three-phase transmission lines in real-time. The system uses an Arduino board as the central controller connected to voltage transformers, an LCD display, WiFi module, and relays. When a fault occurs, the Arduino detects the type of fault (e.g. line-to-ground), calculates the exact location, and sends a signal to isolate the faulted section via relays. The information is also transmitted remotely over WiFi and displayed locally on the LCD. The system aims to minimize human effort in fault management and improve reliability of power transmission.