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南桠河三级水电站为径流引水式电站,位于四川省石棉县境内大渡河支流南桠河上,总装机容量12万kW,设计水头265m,年发电量6.5亿kW·h。电站首部枢纽主要有拦河闸坝、高低引水渠、沉砂池等。洪水期(6～10月)水流由低渠进水闸经低引水明渠和沉砂池进入隧洞发电;枯水期水流由高渠进水闸经高渠道进入隧洞发电。
The Nancha River 3rd-level hydropower station is a runoff diversion type power station located on the south bank of the Dadu River tributary in Shimian County, Sichuan Province. It has a total installed capacity of 120,000 kW, a designed water head of 265m and an annual power generation capacity of 650 million kW·h. The main hubs of the power station include river gate dams, high and low diversion canals, and grit chambers. During the flood period (June-October), the flow of water from the low channel inflow sluice through the low diversion open channel and the grit chamber enters the tunnel to generate electricity; during the dry season, the flow of water enters the tunnel from a high canal inflow channel through a high channel to generate electricity.