World's highest voltage level converter station begins annual 'physical examination'

On Oct 28, at the ±1100 kV Guquan converter station located in Xuancheng city, Anhui province, two cranes and a lifting platform truck were utilized to replace wall bushings within the 30-meter-high valve hall. The 2024 annual maintenance of the Guquan converter station is currently in full swing.

The "Changji-Guquan" UHVDC transmission project currently holds the world record for the highest voltage level, largest transmission capacity, longest transmission distance and most advanced technology. Since its commissioning on Sept 26, 2019, the Guquan converter station, the landing point of the project, has delivered a cumulative total of over 280 billion kilowatt-hours of electricity. This summer, it has repeatedly set world records for power transmission projects, such as delivering over 250 million kilowatt-hours of electricity per day and operating at a high load of 10.8 million kilowatts for over 13.5 hours.

The primary maintenance period spans from Oct 26 to Nov 1 due to the substantial workload, limited time and multiple maintenance tasks to be carried out. Forty-one participating units and over 840 power maintenance personnel are scheduled to perform 6,537 routine maintenance tasks, 32 special maintenance tasks, 77 defect elimination tasks, 18 hidden danger mitigation tasks and 14 software modifications, among others.