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Lavarak Power Plant
History and background
Basic studies of the Lavarak project, with the capacity of 47 MW in form of taking advantage from Lar dam equipments and its diversion tunnels, was carried out by Alexander Gip and Organic Consulting Engineers. This project was approved in 1975.
In 1977 access tunnel to powerhouse cavern was completed with the length of 1000 m for geotechnical tests.
In 1980 Lar dam water transition through pipe lines and tunnels with the length of 3 kilometer to Latian dam lake and finally to Tehran became necessary.
In 1981 the project was handed over to Lar Consulting Engineers.
In 1984 the geotechnical complementary tests (excavation of trenches, sampling and in-the-field tests) was carried out by Japanese Komogaigomo Co.
In 1997 Australian Smec Co. started cooperating with Lar Consulting Engineers.
1n 2000 the project was handed over to Iran Water and Power Resources Development Co. and the studies were followed more rapidly.
In 2001 the documents were reviewed and tender documents were prepared in form of three main contract
In 2002 construction activities began by Hara Institute including excavation of access tunnel to cavern crest, penstock and ventilation shafts...
Targets
  • Construction of Lavarak underground power station with the capacity of 47 MW
  • Annual power generation of 151 million kwh
  • Completing part of Lar dam water transfer facilities to Tehran fifth water filtering plant
Location
This project is located in 35°48¢ and 16°37² of geographical latitude and 51°44¢ and 51°44² of geographical longitude and is situated adjacent to Niknamdeh village in the area of Lavasanat.
Technical Information

  • Forebay pond
    Forebay pond for regulating and reserving water in Lavarak power plant
    Structure type: concrete
    Dimensions: 45*45 m
    Volume of old pond: 10000 m3
    Volume of new pond: 8000 m3
    Total volume of pond: 18000 m3


  • Penstock
    Type: steel (ST 52)
    Diameter: 1.2 m
    Length of powerhouse penstock: 970 m
    Thickness of penstock plate: 10 to 25 mm
    Height of penstock shaft: 218 m
    Diameter penstock shaft excavation: 3.1 m
    Length of penstock from the pond to shaft area: 740 m
    Amount of used steel: 800 tons


  • Post, switchyard and powerhouse
    Numbers of main transformers: 2
    Apparent power of transformer: 27 MVA
    Alteration ratio: 230 to 11 kv
    Post type: Out-Door
    Voltage of generator: 11 kv
    Rotation speed: 750 rounds/minute
    Installation capacity: 47 MW
    Turbine type: Francis with vertical axis
    Head: 280 m
    Discharge of each unit: 9.25 m3/s


  • Transformer cavern
    Turbine, generator and other equipments are embedded underground
    Cross section: U shape
    Excavation diameter: 15.1 m
    Finished diameter: 13.8 m
    Length of cavern: 78 m
    Numbers of silos: 2
    Diameter of silos: 12.2 m
    Height of silos: 13 m
    Excavation volume: 14500 m3
    Volume of silos: 3000 m3
    Concrete placement volume of cavern structure: 4600 m3


  • Outlet tunnel
    Length of tunnel: 1983 m
    Cross section: U shape
    Finished diameter of tunnel: 3.3 m
    Tunnel slope: 1:450
    Hydraulic current type: free


  • Control and operation building
    Type of structure: concrete
    Total area: 1800 m2


  • Project special features
    The project has the deepest powerhouse shafts made by local contractors


  • Ventilation and elevator shaft
    They are made for fast and easy access to powerhouse cavern and relevant equipments at time of operation, transferring outlet cables from powerhouse generator and ventilation of the underground space
    Excavation diameter: 5.1 m
    Lining type: reinforced concrete with the thickness of 40 cm
    Shaft height: 210 m
 
 
 
 
 
 
 
 
 
 


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