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Yasuj Chain Power Plants
History and background
Studies of the Yasuj Chain Project began in 1989 by Jihad Ministry and cooperation of Chinese Research Institute (ECHIDI). In basic studies construction of a reservoir dam had been predicted which was cancelled due to complex geological situation and technical difficulties. In further studies several other options were studied and finally the option of nine chain power plants with the capacity of 20 MW was approved by the client.
Construction activities of six of these nine power plants which had economical priority began. Karick1 and Polkolu1 were completed and put into operation in 1994 and 2004. Construction activities of Karick2 and Karick3 were also finished in 2006. Two power plants of Polkolu2 and Kohkdan were also tested in June 2007 and put into operation.
Power plants of Yasuj Chain Project are as follows:
  1. Polkolu1
  2. Polkolu2
  3. Kokhdan
  4. Karick1
  5. Karick2
  6. Karick3
Targets
  • Annual generation of 49.9 million kwh energy
Location
This project is located in 51°25¢ of geographical longitude and 30°55¢ of geographical latitude in Kohkiloyeh va Boyerahmad Province in 40 km distance of Yasuj City in Sisakht mountainous area.
Technical Information

Technical specifications of Polkolu1 Power Plant

  • Diversion dyke
    Type: Concrete
    Spillway length: 8 m
    Height: 4 m
  • Water transfer channel
    Type: Rectangular concrete
    Dimensions: 1.6*1.94 m
    Length: 1725 m
  • Reservoir
    Volume: 30000 m3
    Dimensions: 4.69*32*200 m
  • Penstock
    Type: Steel
    Numbers: 1
    Diameter: 100 cm
    Length: 257m
    Thickness: 12 mm
  • Powerhouse
    Type: Current On-the-ground
    Discharge of each unit: 3.1 m3/s
    Head: 147.5 m
    Building: Concrete structure with dimensions of 7.8*16.5*25
    Installation capacity: 4 MW
    Network type: Public
    Turbine type: Vertical Francis
    Numbers of units: 2
    Numbers of main transformer: 1
    Transformer power: 5 mva
    Alteration ratio: 33 to 6.3 kv
    Operation year: 2004
  • Outlet channel
    Type: concrete
    Dimensions: 3*13.5 m

Technical specifications of Polkolu2

  • Diversion dyke
    No diversion dyke, it feeds from outlet channel of Polkolu 1
  • Water transfer channel
    Type: Rectangular concrete
    Dimensions: 1.94*1.6 m
    Length: 2183 m
  • Forebay
    Volume: 192 m3
    Dimensions: Alternative
  • Penstock
    Type: steel
    Numbers: 1
    Diameter: 100 cm
    Length: 363 m
    Thickness: 12 mm
  • Powerhouse
    Type: Current On-the-ground
    Discharge of each unit: 3.1 m3/s
    Head: 147.5 m
    Building: Concrete structure with dimensions of 9*11*37
    Installation capacity: 4 MW
    Network type: Public
    Turbine type: Vertical Francis
    Numbers of units: 2
    Numbers of main transformer: 1
    Transformer power: 6.3 mva
    Alteration ratio: 33 to 6.3 kv
    Operation year: 2007
  • Outlet channel
    Type: Concrete
    Dimensions: 3*1.6 m

 

Technical specifications of Kokhdan

  • Diversion dyke
    Type: Concrete
    Spillway length: 8 m
    Height: 1.5 m
  • Water transfer channel
    Type: Rectangular concrete
    Dimensions: 1.2*1 m
    Length: 744 m
  • Forebay
    Volume: 60 m3
    Dimensions: 3.42*7*2.5 m
  • Penstock
    Type: Steel
    Numbers: 1
    Diameter: 66 cm
    Length: 194 m
    Thickness: 10 mm
  • Powerhouse
    Type: Current On-the-ground
    Discharge of each unit: 1.15 m3/s
    Head: 97.5 m
    Building: Concrete structure with dimensions of 9*11*37 m
    Installation capacity: 0.8 MW
    Network type: Public
    Turbine type: Vertical Francis
    Numbers of units: 1
    Numbers of main transformer: 1
    Transformer power: 6.3 mva
    Alteration ratio: 33 to 6.3 kv
    Operation year: 2007
  • Outlet channel
    Type: Concert
    Dimensions: 1.6*3 m


Technical specifications of Karick1

  • Diversion dyke
    Type: Concrete
    Spillway length: 3 m
    Height: 3 m
  • Water transfer channel
    Type: Concrete
    Dimensions: 1.5*2 m
    Length: 1900 m
  • Forebay
    Volume: 270 m3
    Dimensions: 5.4*10*5 m
  • Penstock
    Type: Steel
    Numbers: 2
    Diameter: 76 cm
    Length: 146 m
    Thickness: 10 mm
  • Powerhouse
    Type: Current On-the-ground
    Discharge of each unit: 3.3 m3/s
    Head: 93 m
    Building: Metal structure with dimensions of 57*15*30 m
    Installation capacity: 2.5 MW
    Network type: Public
    Turbine type: Vertical Francis
    Numbers of units: 2
    Numbers of main transformer: 1
    Transformer power:  4 mva
    Alteration ratio: 20 to 6.3 kv
    Operation year: 1994
  • Outlet channel
    Type: Concrete
    Dimensions: 13.5*5 m

Technical specifications of Karick2

  • Diversion dyke
    No diversion dyke, it feeds from outlet channel of Krick 1
  • Water transfer channel
    No water transfer channel
  • Penstock
    Type: Steel
    Numbers: 1
    Length: 1750 m
  • Powerhouse
    Type: Current On-the-ground
    Discharge of each unit: 3.3 m3/s
    Head: 97.5 m
    Building: Metal structure with dimensions of 7*10*27
    Installation capacity: 2.5 MW
    Network type: Public
    Turbine type: Vertical Francis
    Numbers of units: 2
    Numbers of main transformer: 1
    Transformer power:  4 mva
    Alteration ratio: 33 to 6.3 kv
    Operation year: 2006
  • Outlet channel
    Type: Concrete
    Dimensions: 6.2*5.6 m

Technical specifications of Karick 3

  • Diversion dyke
    Type: Concrete
    Spillway length: 16 m
    Height: 5.8 m
  • Water transfer channel
    Type: Concrete
    Dimensions: 1.65*1.94 m
    Length: 2977 m
  • Forebay
    Volume: 283 m3
  • Penstock
    Type: Steel
    Numbers: 1
    Diameter: 100 cm
    Length: 792 m
    Thickness: 12 mm
  • Powerhouse
    Type: Current On-the-ground
    Discharge of each unit: 3.3 m3/s
    Head: 103 m
    Building: metal structure with dimensions of 7*10*27
    Installation capacity: 3 MW
    Network type: Public
    Turbine type: Vertical Francis
    Numbers of units: 2
    Numbers of main transformer: 1
    Transformer power:  5 mva
    Alteration ratio: 33 to 6.3 kv
    Operation year: 2006
  • Outlet channel
    Type: Concrete


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