|Tianhuangping Pumped Storage Power Station|
|Location||Tianhuangping, Anji County of Zhejiang Province, China|
|Construction cost||$900 million USD|
|Total capacity||6,760,000 m3 (5,480 acre⋅ft) (Normal)|
|Total capacity||6,770,000 m3 (239,000,000 cu ft) (Normal)|
|Hydraulic head||887 m (2,910 ft)|
|Pump-generators||6 reversible Francis turbines|
|Installed capacity||1,836 MW|
2,016 MW (Planned)
The Tianhuangping Pumped Storage Power Station is a pumped-storage power station in Tianhuangping, Anji County of Zhejiang Province, China. The power station has an installed capacity of 1,836 megawatts (2,462,000 hp) utilizing 6 reversible Francis turbines. Construction began in 1993 and the power station was completed in 2004.
China, officially the People's Republic of China (PRC), is a country in East Asia and the world's most populous country, with a population of around 1.404 billion. Covering approximately 9,600,000 square kilometers (3,700,000 sq mi), it is the third- or fourth-largest country by total area. Governed by the Communist Party of China, the state exercises jurisdiction over 22 provinces, five autonomous regions, four direct-controlled municipalities, and the special administrative regions of Hong Kong and Macau.
The Francis turbine is a type of water turbine that was developed by James B. Francis in Lowell, Massachusetts. It is an inward-flow reaction turbine that combines radial and axial flow concepts.
Situated on the Daxi Creek, the Tianhuangping Dam creates the power station's lower reservoir. The concrete face rock-fill dam is 72 metres (236 ft) high and 577 metres (1,893 ft) long. The dam creates a reservoir that can store 6,770,000 cubic metres (5,490 acre⋅ft) of water and contains an uncontrolled side-weir spillway that can discharge a design level of 536 cubic metres per second (18,900 cu ft/s).
The Daxi Creek is a tributary of the Xitiao River in Anji County of Zhejiang Province, China. It is interrupted by the Tianhuangping Dam.
A dam is a barrier that stops or restricts the flow of water or underground streams. Reservoirs created by dams not only suppress floods but also provide water for activities such as irrigation, human consumption, industrial use, aquaculture, and navigability. Hydropower is often used in conjunction with dams to generate electricity. A dam can also be used to collect water or for storage of water which can be evenly distributed between locations. Dams generally serve the primary purpose of retaining water, while other structures such as floodgates or levees are used to manage or prevent water flow into specific land regions. The earliest known dam is the Jawa Dam in Jordan, dating to 3,000 BC.
From the lower reservoir, water is pumped up into the upper reservoir which has a normal storage capacity of 6,760,000 cubic metres (5,480 acre⋅ft). The upper reservoir is artificial and cut into the mountain and created with the assistance of four saddle dams. When power is being generated, the water leaves the reservoir and falls through two 882 metres (2,894 ft) long and 7 metres (23 ft) diameter penstocks down towards the power station which is above the lower reservoir. Before reaching the reversible turbines, the water branches off into six branch pipes.
A penstock is a sluice or gate or intake structure that controls water flow, or an enclosed pipe that delivers water to hydro turbines and sewerage systems. The term is inherited from the earlier technology of mill ponds and watermills.
The six branch pipes feed water into the six turbines. Each reversible Francis turbine has a 306 megawatts (410,000 hp) installed capacity and 336 megawatts (451,000 hp) maximum capacity. The turbines and generators are stored in an underground power house measuring 198.7 metres (652 ft) long, 21 metres (69 ft) wide and 47.7 metres (156 ft) high. After power is produced, the water is discharged back into the lower reservoir and the entire process can repeat.
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