Core Viewpoint - The successful operation of the 330 kV Gas Insulated Metal Enclosed Transmission Line (GIL) at the Lanzhou West Substation marks a significant advancement for the Gansu Central Power Grid, providing a crucial foundation for network optimization and stability [1][3]. Group 1: Project Overview - The GIL project is the first of its kind in Gansu Province, featuring the longest single-phase GIL unit in China, measuring 280 meters [1][3]. - The project aims to meet the needs of the Gansu Central Power Grid's loop-breaking requirements by adjusting the spacing of the Xixin I and Xizi I lines [3][4]. Group 2: Technical Advantages - GIL technology offers significant advantages over traditional overhead lines and power cables, including reduced land occupation, shorter construction periods, and greater resilience to adverse weather conditions [3][4]. - Compared to cables, GIL has a higher current-carrying capacity and a longer design lifespan, making it a superior choice for compact substation layouts [3][4]. Group 3: Construction Challenges and Solutions - The installation faced challenges such as complex environmental conditions, proximity to live equipment, and high cleanliness requirements [3][4]. - The project team employed specialized installation machinery to safely handle GIL units while maintaining a safe distance from live lines, significantly reducing operational risks [4][5]. Group 4: Operational Impact - The successful commissioning of the GIL line enhances the safety and reliability of the Lanzhou urban power grid, facilitating its integration into the Qin Chuan power grid system [4][5]. - This project represents a critical breakthrough in the loop-breaking efforts of the Gansu Central Power Grid, optimizing the grid structure and improving operational safety [4][5]. Group 5: Quality Assurance Measures - To ensure "zero defect" operation, the company implemented strict quality control measures, including on-site supervision and collaboration among construction, supervision, and manufacturing teams [5]. - The project management emphasized safety and quality standards, with experts and management personnel closely monitoring the construction process [5].