en.Wedoany.com Reported - On May 26, the stator for Unit 4 of the State Grid Xinyuan Hebei Yixian Pumped Storage Power Station, constructed by Sinohydro Bureau 4 Co., Ltd., was hoisted into place. This marks the final stator hoisting for the power station. With this, the stator hoisting work for all four units has been completed, laying the foundation for subsequent rotor hoisting and overall unit assembly.
The Hebei Yixian Pumped Storage Power Station is located in Yi County, Baoding City, Hebei Province. Its main structures include an upper reservoir, a water conveyance system, an underground powerhouse and switchyard, and a lower reservoir. The station is equipped with four 300 MW reversible pump-turbine generator units, with a total installed capacity of 1,200 MW. It will connect to the Southern Hebei power grid via a 500 kV line, undertaking tasks such as peak shaving, valley filling, frequency regulation, phase modulation, and emergency reserve. Sinohydro Bureau 4 Co., Ltd. is responsible for the overall construction of the station.
The stator is the core component for energy conversion in the generator unit, consisting of the frame, core, and windings. Its installation precision directly affects the long-term operational stability and efficiency of the unit. After the core stacking of the Unit 4 stator was completed, the cylindricity was only 0.29 mm, and the waviness was controlled within 2 mm. It passed electrical tests such as core magnetization and overall withstand voltage in one attempt, with all installation data exceeding industry standards and manufacturer requirements, achieving "zero defects, zero rework."
The stator for Unit 4 has an outer diameter of 8,660 mm, a frame height of 4,150 mm, and a total height of 5,710 mm when combined with the stator support piers. The hoisting weight is approximately 370 tons, with the total lifting weight including rigging reaching 472.6 tons. Facing the high-risk challenges of hoisting large components, the project team optimized the hoisting plan, strictly implemented safety and technical briefings, precisely planned the hoisting path, and conducted real-time monitoring throughout the entire process. Ultimately, the stator was smoothly and accurately placed into its predetermined position in one successful operation.
On April 30, Unit 2 of the power station completed its 15-day trial operation and was officially put into commercial operation. Currently, the project team is advancing the commissioning of Unit 3, the rotor hoisting for Unit 4, and overall assembly and commissioning work to ensure the goal of full commercial operation is achieved on schedule.
The Hebei Yixian Pumped Storage Power Station has an annual designed generating capacity of 1.807 billion kWh. Once completed, it can meet the annual electricity demand of approximately 2.2 million residents, save about 126,000 tons of standard coal annually, and reduce carbon dioxide emissions by 213,000 tons, contributing to the optimization of the energy structure and the realization of the "dual carbon" goals.
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