PDF - 9Mo - Grande Dixence SA

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GD. P.54Nendazpower plantThe biggest hydropower plantin Switzerland after BieudronThe waters of <strong>Grande</strong> <strong>Dixence</strong>, having been turbineda first time at the Fionnay plant in the Bagnes valley,dive back deep inside the rock. They cross the mountainagain in the direction of the neighbouring Nendazvalley.The precious water - the “white gold” - is again channelledinto a pressure tunnel that ends in the Pérouasurge tank, 1000 metres above the Nendaz generatingstation. This second power plant is just as discreteand invisible as the one at Fionnay, because it too ishidden inside the mountain. It lies between Aproz andRiddes, on the banks of the Rhône, 478 m. above sealevel.The tunnel linking Fionnay and Nendaz is 16 kilometreslong and ends in another steel-lined penstock.On the way, water from the Fara, originating in theIsérables Valley, is added to the flow heading towardsNendaz.The Nendaz generating station is the biggest hydropowerplant in Switzerland after Bieudron. It workson the cascade principle with the Fionnay station, i.e.its capacity and discharge rate are modulated in tandemwith Fionnay. Together, the two stations generatearound 2 billion kWh per year.The plant has 6 generating units each equipped with2 Pelton turbines, giving a total capacity of 430 MW.14542314914157111414N13812345678910111213141516Nendaz steel-lined shaft. ø 2.9 mValve chamberMachine hallTransformersGallery and gangway of the 220 kV cables of the first 3 sets220 kV cables of the last 3 setsTailrace canalTailrace canal partial bulkheadPower plant access tunnelRhône bridgeService building, workshop and entrance to power plantChamoson switchyard control buildingWorkshop and central depôtProtective fillFionnay-Chamoson 220 kV lineChamoson 220 kV switchyard5610 101216
GD. P.551234567Nendaz steel-lined penstock, ø 2.9 mValve chamberTailrace canalTurbo-generating unitsMachine hallOverhead travelling craneTransformersCross-section of power plant6 horizontal units comprising:1 alternator and 2 Pelton turbinesTotal station discharge rate: 45 m 3 /sec.Gross head: max. 1008 m; min. 1002 mInstalled power: 6x80 MVA = 480 MVA6x80 MVA three phase transformers61 52473
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Grande Dixence -a legend in the hea
Page 3 and 4: GD. P.3SummaryEpic construction of
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Page 11 and 12: GD. P.111951: Construction works st
Page 13 and 14: GD. P.13Le Chargeur, fabrication of
Page 15 and 16: GD. P.153000 men totame the powerof
Page 17 and 18: GD. P.17The pace of work was intens
Page 19 and 20: GD. P.19Ropeway shuttle
Page 21 and 22: GD. P.21Typesof damGravity damGrand
Page 23 and 24: GD. P.23Nendaz power plant, excavat
Page 25 and 26: GD. P.25Working conditions on the d
Page 29 and 30: GD. P.29The highest wallin the worl
Page 33 and 34: GD. P.33VIEGERIVERSTAFELSTATIONALT:
Page 35 and 36: GD. P.35Z’Muttpumping stationBeau
Page 37 and 38: GD. P.37Stafelpumping stationAt the
Page 39 and 40: GD. P.39Ferpècle afterbay reservoi
Page 41 and 42: GD. P.41Arollapumping stationA high
Page 43 and 44: GD. P.43Lake Dix
Page 51 and 52: GD. P.51Fionnay power plant
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Page 57 and 58: GD. P.57Bieudron power plant
Page 59 and 60: GD. P.59Extreme pressures!The penst
Page 65 and 66: GD. P.65CEGElectricity prices vary
Page 71 and 72: GD. P.711 kWh1 MWh1 GWh1 TWhUNITS O
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