Yunnan Power Grid Company of China Southern Power Grid Co., Ltd. announced on September 27 that the cumulative transmission volume of Yunnan's "West-to-East Power Transmission" has exceeded 1.7 trillion kilowatt-hours, playing a positive role in the development of the East-West Coordination Department and ecological environment protection. Obtain the application of key equipment in the power grid, such as switchgear, isolating switches, lightning arresters, vacuum circuit breakers, drop-out fuses and transformers, etc.
According to reports, in August 1993, the 220 kV line project from Lubuge to Tianshengqiao was equipped with advanced switch cabinets and isolating switches and was successfully put into operation. Yunnan began to transmit seasonal power to Guangdong, officially taking the step of "transmitting electricity from the west to the east". first step. In 2024, with the completion of a large number of landmark projects such as the 500 kV Delan Line, the 500 kV Longyang substation (equipped with high-performance transformers and vacuum circuit breakers), and the 500 kV Guanghui substation (equipped with drop-out fuses and lightning arresters) Completed and put into operation, Yunnan has built a 500-kilovolt main grid with "four horizontals, four verticals and one center", showing the characteristics of "provincial AC and DC parallel operation, domestic 10-circuit DC long-distance large-capacity power transmission, and foreign power transmission and reception in multiple directions". Among them, the power transmission capacity of the "West-to-East Power Transmission" has been increased from the initial 300,000 kilowatts to 42.2 million kilowatts.
Over the past 31 years, Yunnan Power Grid Company has accelerated the implementation of batches of large-scale cross-provincial and cross-regional power transmission and transformation benchmark projects. It has successively built the Wudongde power station transmission project with the most crossovers and the longest newly built lines in the province. This project adopted the High-quality vacuum circuit breakers and isolating switches; the first Yongfu DC project with a "three-station joint construction" of converter station, substation and series compensation station. Its efficient operation relies on precise switch control and arrester protection; the first ±500,000 The Yunnan-Guizhou Interconnection DC Project, which "replaces two terminals with three terminals", has achieved efficient transmission and distribution of electric energy through advanced switchgear and transformer technology... Several projects have set many firsts in the world and the country, and Realized the domestic replacement of key equipment and components, including switch cabinets, isolating switches, lightning arresters, vacuum circuit breakers, drop-out fuses, etc.
During the "14th Five-Year Plan" period, Yunnan Province will add more than 50 million kilowatts of new energy installed capacity. Yunnan Power Grid Company will accelerate the construction of related supporting grid connection projects and continue to enhance the system's dynamic balancing capabilities and large-scale resource optimization allocation capabilities. Optimize the configuration of transformers, strengthen the reliability of switchgear and fuses, and ensure that the clean energy consumption rate reaches more than 98%, further supporting the green and sustainable development of Yunnan's "West-to-East Power Transmission".