On August 30th, two sets of Jiuquan-developed converter transformers for the China Xidian-Hunan ±800kV UHV DC transmission project, specifically the ZZDFPZ-412300/750-400 model, successfully passed all tests on the first attempt. All performance indicators met or exceeded national standards and technical agreements, achieving an international leading level. This milestone marks the successful development of the largest domestically produced converter transformer on the grid side at 750kV, a significant achievement in China's power infrastructure.
The Jiuquan-Hunan ±800kV UHV DC transmission project was initiated to support the growth of the Jiuquan Wind Power Base and meet the rising electricity demand in Hunan. By promoting clean energy utilization, optimizing coal resource development, and transforming natural resources into economic benefits, this project plays a vital role in advancing a low-carbon economy and implementing the nation’s energy strategy.
In August 2015, China Xidian secured the contract to supply seven sets of ±400kV and seven sets of ±200kV converter transformers for the Jiuquan-Hunan ±800kV UHV DC transmission project. These were the first 750kV and ±400kV (±200kV) voltage-class converter transformers that Xidian accepted for the grid side, and they represent the largest capacity of such equipment domestically.
Xidian West, a subsidiary of China Xidian responsible for the development, placed high priority on this key national project. The team meticulously prepared a quality assurance plan, defined inspection requirements for critical control points, and ensured a solid foundation for smooth equipment production.
With its strong economic efficiency and high technical reliability, the ±800kV voltage level DC engineering is expected to become the main voltage level in China’s future DC transmission system. Particularly for grid-side access to the 750kV AC system, the technology will be widely applied in upcoming ±800kV and even ±1100kV DC projects, offering broad market potential and long-term growth opportunities.
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