Venda Nova dam

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Venda Nova dam
Barragem da venda nova.jpg
location
Venda Nova dam (Portugal)
Venda Nova dam
Coordinates 41 ° 40 '46 "  N , 7 ° 58' 57"  W Coordinates: 41 ° 40 '46 "  N , 7 ° 58' 57"  W.
country PortugalPortugal Portugal
place Braga district
Waters Rabagão
Height upstream 700  m
power plant
owner Companhia Portuguesa de Produção de Electricidade (CPPE)
operator Energias de Portugal (EDP)
Start of planning 1948
Start of operation 1951
technology
Bottleneck performance I: 90, II: 194, III: 746 megawatts
Average
height of fall
I: 354.8 to 414.2, II: 422 m
Expansion flow I: 30.5, II: 100, III: 200 m³ / s
Standard work capacity I: 383.9, II: 220, III: 1,441 million kWh / year
Turbines I: Pelton turbines 3 × 29.094, II: Francis turbines 2 × 97.1 MW, III: 2 × 373 MW
Generators I: 3 × 32 MVA, II: 2 × 106.4 MVA
Others

The Venda Nova Dam ( Barragem da Venda Nova in Portuguese ) is located in the north of Portugal . It dams the Rabagão , which at this point forms the border between the districts of Braga and Vila Real . About three kilometers below the dam, the Rabagão flows into the Cávado , which is dammed here by the Salamonde dam.

The project to build the dam began in 1948. The construction was completed in 1951. The dam is used to generate electricity. It is owned by the Companhia Portuguesa de Produção de Electricidade (CPPE).

Barrier structure

The barrier structure is an arch dam (or arch weight dam ) made of concrete with a height of 97 m above the foundation base . The 230, according to another source, 294 m long crest of the wall lies at a height of 701 m above sea level . The volume of the structure is 228,000 m³. The dam was designed by André Coyne .

The dam wall has both a bottom outlet and a flood relief with two gates. A maximum of 135 m³ / s can be discharged via the bottom outlet, and a maximum of 1100 m³ / s via the flood discharge. The design flood is 1500 m³ / s.

Reservoir

With a normal storage target of 700 m, the reservoir extends over an area of ​​around 4 km² and holds 94.5 (or 96.5) million m³ of water - of which 93 (or 92.1) million m³ can be used. The minimum congestion target is 645 m. With the usable 92.1 million m³ of water, 125.2 million kWh can be generated.

Vila Nova power plant

The Vila Nova power plant houses both the three machines that are supplied with water from the Venda Nova dam and the machine that is supplied by the Paradela dam .

Venda Nova I power plant

With an installed capacity of 90 (or 135 or 144) MW, the Venda Nova I power plant is one of the medium-sized hydropower plants in Portugal . The average annual generation is 383.9 (or 389 or 439) million kWh.

The three Pelton turbines with a horizontal shaft each have a maximum output of 29.094 MW and the associated generators 32  MVA . The rated speed of the turbines is 428.6 / min. The generators have a nominal voltage of 11  kV . In the switchgear , the generator voltage of 11 kV is increased using power transformers.

The three machines of the power plant are located in a machine house, which is connected to the dam by a 2650 m long tunnel and an 820 m long penstock .

The minimum height of fall is 354.8 m, the maximum 414.2 m. The maximum flow rate is 10.5 m³ / s per turbine.

Paradela power plant

With an installed capacity of 54 MW, the power plant is one of the smaller hydropower plants in Portugal. The average annual production is 254 million kWh.

Venda Nova II power plant

The Venda Nova II power plant is a pumped storage power plant with an installed capacity of 194.2 (or 191.6) MW. The average annual production is 220 million kWh. The reservoir of the Salamonde dam serves as a lower basin for the pumped storage power plant. Construction began in 1997 and was completed in 2004. Electricity was generated for the first time in August 2005.

The Francis turbines and the generators were supplied by Voith Siemens Hydro . You are in an underground machine house that is 350 m below the surface.

The 2 reversible Francis pump turbines together provide a maximum of 194.2 MW and the associated generators 212.8  MVA . The nominal speed of the turbines is 600 / min. The generators have a nominal voltage of 12 kV. In the switchgear , the generator voltage is increased from 12 kV to 150 kV using power transformers. In pumping operation, the machines have a maximum power consumption of 189.4 MW and convey a maximum of 42.6 m³ / s.

The maximum height of fall is 422 m. The maximum flow rate is 51 m³ / s per turbine.

The power plant is owned by the CPPE but operated by EDP .

Venda Nova III power plant

With an installed capacity of 746 MW, the Venda Nova III power plant is the largest pumped storage power plant in Portugal. The average annual production is 1.441 billion kWh.

Construction began in April 2010. The power plant is scheduled to go online in July 2015. Two reversible pump turbines with an output of 373 MW each will be installed in an underground machine house. The costs for Venda Nova III amount to € 322.5 (or 350) million.

The maximum flow rate is 200 m³ / s.

See also

Remarks

  1. The output of 135 MW given by REN expressly refers to the two dams Venda Nova and Paradela.
  2. The output of 144 MW given by APA is obviously the sum of 90 MW for the Venda Nova dam and 54 MW for the Paradela dam.

Individual evidence

  1. a b c d e f VENDA NOVA DAM. APA Barragens de Portugal, accessed February 1, 2015 .
  2. a b c d Venda Nova dam. Structurae International Database for Structures and Civil Engineers, accessed February 1, 2015 .
  3. a b c d e f Venda Nova Informação Técnica. EDP , accessed February 1, 2015 (Portuguese).
  4. a b c d DECLARAÇÃO AMBIENTAL 2012. (PDF 16.1 MB pp. 20–21 (18–19)) EDP, accessed on February 1, 2015 (Portuguese).
  5. a b c António Freitas da Costa, Maria Eugénia Resende, Manuel Alberto Oliveira, Vítor Ribeiro: Design and Construction Innovations. HydroWorld.com, accessed February 1, 2015 .
  6. ^ Hidroelectricidade em Portugal memória e desafio. (PDF 226 kB p. 29 (27)) Rede Eléctrica Nacional, SA (REN), accessed on November 10, 2014 (Portuguese).
  7. a b c Venda Nova II PS Hydroelectric Power Plant Portugal. Global Energy Observatory, accessed February 1, 2015 .
  8. a b Project Report Venda Nova II. (PDF 2.0 MB) (No longer available online.) Voith , archived from the original on August 8, 2014 ; accessed on February 1, 2015 .
  9. a b Venda Nova III Informação Técnica. EDP , accessed February 1, 2015 (Portuguese).
  10. a b Reforço de Potência da Venda Nova III. peri.pt, accessed February 1, 2015 .