Abstract: This paper aims to monitor and diagnose faults of infrastructure equipment inside UHV converter stations by building a digital and intelligent monitoring and management system. First, a digital and intelligent management system for equipment status monitoring covering three modules, namely perception, network, and application, is built. The perception module monitors the physical information of the equipment during operation and transmits the data to the network module. The network module displays the information data measured by the sensor on the main station server. The application module analyzes and summarizes the data of the above two modules to form equipment evaluation data, which provides a basis for fault diagnosis.