Project profile : This project is a turnkey project. Due to the needs of the development of Nantian Power, it is planned to transfer the 220KV GIS switch station (11 intervals) and its supporting protection system and the whole plant RTU system to a new location of about 300 meters away. On the basis of ensuring that the original equipment will not be damaged, 220KV high-voltage cable are cut on one side and then rebinding, and more than 400 secondary voltage cables are rewiring one side and keep anotherside original. Due to the complexity of the project and the tight time, the project is more difficult than the installation and commissioning of similar new equipment. Therefore, after receiving the project, engineers are organized immediately to perform detailed deductions several times, and the tasks are decomposed into each signal and each cable terminal. After an intense and orderly construction, the 220KV GIS system was put back to operation successfully in the first time.