宁东—山东±660 kV 直流输电示范工程是世界上首个±660 kV电压等级的直流输电工程，具有重要示范意义。国家电网公司建设部在该工程中坚持科技创新与管理创新并举，创造性地提出了“三维数字化移交”的新思路。在宁东—山东±660 kV直流输电示范工程中，对实施三维数字化移交的工作过程和移交成果进行了研究，同时依托示范工程编制了标准化文档，总结了三维数字化移交经验，对三维数字化移交未来的发展方向和应用前景提出建议

Ningdong-Shandong ± 660 kV DC Power Transmission Pilot Project is the first DC transmission project of ± 660 kV voltage class in the world, which has important demonstrative meanings. In the project, the construction department of SG Corp. adheres to both technology innovation and management innovation, and creatively proposes a new idea of "three-dimensional digitalization transfer" (TDDT). This study has researched the work process and result of implementing TDDT. Meanwhile, a standardization document is developed on the basis of the project. Furthermore, the study summarizes experience of TDDT and also puts forward a proposal for the development direction and application future of TDDT. TDDT is an innovation of power grid project transfer approach and management, which has considerable popularization value and can better services for the grid design, construction, operation and maintenance.