山西±800千伏特高压雁门关换流站年度检修顺利结束

Core Insights - The successful unlocking of the bipolar converter at the Yanmenguan converter station marks the completion of the 2025 annual maintenance work, with a direct current power output reaching 800 MW [1][3]. Group 1: Project Overview - The ±800 kV Yanmenguan–Huai'an UHVDC project connects Shanxi and Jiangsu, with a maximum transmission capacity of 8 million kW, ensuring stable power supply for East China [3]. - As of September 30, the project has operated safely for 3,014 days, delivering a cumulative electricity volume of 287.9485 billion kWh, equivalent to approximately 1 billion tons of coal and reducing CO2 emissions by 264 million tons [3]. Group 2: Maintenance and Inspection - The annual maintenance involved 22 participating units and 552 personnel, completing 6 routine inspections, 22 special inspections, 5 major repairs, 63 defect rectifications, and 11 hazard mitigations [3]. - Key tasks included addressing hydraulic operation issues of GIS circuit breakers, overhauling the arc extinguishing chamber of the AC filter circuit breakers, and enhancing the design of the low-end converter transformer tap changer [3][4]. Group 3: Safety Management - The Yanmenguan converter station implemented a "five-level five-control" safety management system, establishing seven working groups to ensure comprehensive risk management during maintenance [4]. Group 4: Independent Repair Capabilities - The station's team independently completed the modification of 14 low-end converter transformer tap changer covers in three days, enhancing their self-repair capabilities [5]. - The team conducted electrical tests on the low-end converter transformer, independently managing the entire process from instrument connection to data confirmation, ensuring the reliability of the equipment post-maintenance [6].