Application of Digital Twin Technology in Health Assessment and Fault Diagnosis of Intelligent Substation

With the development of strong smart grid in China, the modular construction of smart substation has become a trend, and the smart modular substation with GIS (gas insulated switchgear) as the core has become the mainstream direction. Using digital twin technology, this study establishes a set of GIS intelligent substation health assessment and fault diagnosis model based on digital twin. The model can display the values of various instruments in the physical substation synchronously, can carry out health assessment and fault diagnosis of the equipment based on real-time data and historical data, and display the results in the model in three dimensions, with accurate indication of fault types and locations. This model can reduce the workload of on-site inspection by operation and maintenance personnel, give early warning to the possible equipment faults in advance, and provide reference and instructions for maintenance personnel to enter the site to eliminate defects.