Introduction  In view of the digital transformation under the development of big data and the Internet, the application status of digital twin technology in power grid engineering is analyzed.

  Method  The equipment and production data was integrated based on the constructed 3D model which maps the actual project. Therefore, a data link between reality and virtual space was formed, and an intelligent digital twin based power grid operation and maintenance platform was established which matches the needs of power grid operation and maintenance work.

  Result  The platform realizes the deep integration of the station-side data through the invocation, transmission and centralized processing of the data of each subsystem. The function of panoramic information display realizes the visual display of power grid data. The function of intelligent auxiliary monitoring realizes the full-scene equipment monitoring and personnel control. The funtion of intelligent operation and maintenance realizes the reverse intervention guidance by the virtual space to the real project.

  Conclusion  The sensitivity, visiblity and controllability of power grid can be enabled in the digital transformation because of the application of digital twin technology in power grid projects. At the same time, the digital twin technology can also effectively improve the work efficiency and the intelligent integration of system in daily power grid operation and maintenance operations under the new power system.