（Jiangsu Ankura Smart Transmission Engineering Tech Co., Ltd, Liyang 213300, China）
Abstract: Some problems exist in the rigid gas-insulated transmission line (GIL) of the three-phase common box, such as the overburden of the support structure and poor flexibility of temperature compensation. The engineering design with insufficient consideration could easily cause installation interference, support deformation, gas leakage, and other problems. This paper proposed to employ the 3D visual design to carry out the overall layout of the project. Moreover, it used the Workbench for mechanical properties analysis to solve problems, such as GIL line interference, temperature compensation, foundation load calculation, etc. This paper takes a 252 kV three-phase common box GIL engineering design as an example, discusses it from different aspects, such as the overall layout, temperature compensation, support and foundation load, on-site installation, and testing, to provide a reference for the three-phase common box GIL engineering design and industrialization development.
Key words: three-phase common box; rigid gas-insulated transmission line; engineering design; temperature compensation; foundation load
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