Recently, a review meeting on the research results of the 500 kV gas-insulated switchgear in the Three Gorges Underground Power Station was successfully held. The system evaluation showed that its core performance indicators remain excellent, and the overall operating state is stable and reliable. As the first domestic demonstration application of 500 kV GIS equipment with completely independent intellectual property rights, this evaluation not only verified the long-term operation capability of domestic high-voltage switchgear, but also provided an important basis for operation, maintenance and technical optimization of similar equipment. With advantages such as compact structure, high reliability, and convenient operation and maintenance, gas-insulated switchgear has become a key equipment in modern power systems. In 2011, 500 kV GIS equipment for the Three Gorges underground power station was put into operation. In order to systematically evaluate its operating status, in May 2024, the Yangtze River Electric Power Three Gorges Power Plant belonging to the Three Gorges Group and Xi'an Xidian Switching Electric Co., Ltd. launched the “500 kV GIS Equipment Performance Evaluation” project to carry out a full-dimensional and systematic evaluation of the equipment. The project took 18 months and covered four stages of technical inspection, including on-site condition inspection, factory condition assessment, special test research, and component and machine reliability evaluation. Using advanced methods such as reliability data analysis, accelerated life testing, and multidisciplinary joint simulation, the project carried out 23 special tests on 9 types of core equipment, including circuit breakers, isolators, and grounding switches, to form 15 sets of typical performance maps, complete 10 reliability evaluation studies, and output 25 research reports and 1 set of reliability evaluation software models, providing solid support for equipment condition assessment and operation and maintenance optimization.

Recently, a review meeting on the research results of the 500 kV gas-insulated switchgear in the Three Gorges Underground Power Station was successfully held. The system evaluation showed that its core performance indicators remain excellent, and the overall operating state is stable and reliable. As the first domestic demonstration application of 500 kV GIS equipment with completely independent intellectual property rights, this evaluation not only verified the long-term operation capability of domestic high-voltage switchgear, but also provided an important basis for operation, maintenance and technical optimization of similar equipment. With advantages such as compact structure, high reliability, and convenient operation and maintenance, gas-insulated switchgear has become a key equipment in modern power systems. In 2011, 500 kV GIS equipment for the Three Gorges underground power station was put into operation. In order to systematically evaluate its operating status, in May 2024, the Yangtze River Electric Power Three Gorges Power Plant belonging to the Three Gorges Group and Xi'an Xidian Switching Electric Co., Ltd. launched the “500 kV GIS Equipment Performance Evaluation” project to carry out a full-dimensional and systematic evaluation of the equipment. The project took 18 months and covered four stages of technical inspection, including on-site condition inspection, factory condition assessment, special test research, and component and machine reliability evaluation. Using advanced methods such as reliability data analysis, accelerated life testing, and multidisciplinary joint simulation, the project carried out 23 special tests on 9 types of core equipment, including circuit breakers, isolators, and grounding switches, to form 15 sets of typical performance maps, complete 10 reliability evaluation studies, and output 25 research reports and 1 set of reliability evaluation software models, providing solid support for equipment condition assessment and operation and maintenance optimization.