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Kunaban Khola Hydropower Project (24.78 MW)

Kunban Khola Bydropower Project

Kunaban Khola is one of the major perennial tributaries of Myagdi Khola which is a tributary of Kali Gandaki river . The intake of Kunaban Khola Hydropower Project Scheme is located at Kunaban Kharka of Mudi V.D.C. Similarly, the power house also lies about 2 km u/s of Kunaban-Myagdi confluence. The headworks of the project can be connected with the road by constructing about 40 km road. Geographically, the project area is located in between the longitudes 83 °21′ 00”E to 83° 24’ 00” E and latitudes 28° 40′ 00”N to 28° 38’ 00” N. Headworks, Waterways and Power house structures are proposed at the right bank of the river.

  • 1. Project Location

    Development Region : Dhaulagiri
    District : Myagdi
    Intake Site : Near Kunaban Lake
    Powerhouse Site : Dovankharka Village
    Geographical Co-ordinates
    Latitude : 28° 38' 00" N and 28° 40' 00" N
    Longitude : 83° 21' 25" E and 83° 23' 15 E

    2. General

    Name of River : Kunaban Khola
    Nearest Town : Beni
    Type of Scheme : RoR(Run Off River)
    Gross Head : 756 m
    Net rated Head : 728.369m
    Installed Capacity : 24.78 MW
    Average Annual Energy after Outage : 148.40 GWh

    3. Hydrology

    Catchment Area : 76.80 Km2
    Mean Annual Discharge : 8.37 m³/s
    Design Discharge (at 40%PoE) : 4.0 m³/s
    Riparian Release : 0.137 m³/s
    Design Flood Discharge : 238.49 m³/s
    Average Annual Precipitation : 2407.07 mm

    4. Diversion Weir

    Type of Weir : Broad Crested Weir
    Length of Weir : 20.00 m
    Crest Elevation : 3206.00 masl
    Spillway type : Ogee Shaped
    Undersluice Opening (W X H) : 4 x 11.23 m
    Undersluice Crest Level : 3202.30 masl

    5. Intake Structure cum Gravel Trap

    Type of Intake : side
    Nos of Opening : 2 nos
    Size of Intake (W x H) : 1.8 x 2.0 m
    Intake Sill Level : 3203.20m
    Length of Gravel Trap : 19.0 m
    Width of Gravel Trap (Avg.) : 5.5 m
    Overall depth : 10.0 m
    Particle size to be trapped : 5 mm
    Flushing Channel : 0.8 x 0.8 m

    6. Desanding Basin

    Type : Hopper Type, Intermittent Flushing
    Dimension (L x B x H) : 40.0 x 4.8 x 5.0m
    Inlet Transition Length : 10.0 x 8.0m
    Particle Size to be settled : <2mm
    Trapping Efficiency : 96%

    7. Headpond

    Type : Open Channel
    Overall Depth : 7.42m
    Diameter (Or size) : 10.0 x 10.0m
    Normal Operation Level : 3205.18m

    8. Headrace Tunnel

    Type : D – Shaped
    Size : 3.0 x 3.25m
    Length : 4490.0m
    NWL at inlet portal : 3200.76m

    9. Surge Shaft

    Type : Underground
    Overall Depth : 44m
    Diameter (Or size) : 8.0m
    Up surge Level : 3230.16 m
    Down surge Level : 3198.72 m
    Normal Operation Level : 3212.84m

    10. Adit Tunnel

    Size : 3.0 x 3.25 m
    Length : 90 m

    11. Steel Penstock Pipe

    Type : Steel surface type
    Internal Diameter : 1.3 m
    Length : 1780.0 m
    Steel Thickness : 10 – 40mm
    Nos. of Anchor Blocks : 28
    Nos. of Saddle Supports : 268

    12. Powerhouse

    Type : Surface
    Size (L x W) : 50 x 20m
    Height : 15m
    Turbine Axis Level : 2450.0 masl

    13. Tailrace

    Type : Open Channel
    Tailrace Length : 28.0 m
    Size (W x D) : 1.2 x 1.75 m
    Tailrace Water Level : 2447.5714 masl

    14. Turbine

    Type : Pelton, Horizontal Axis
    Number : 2 nos
    Rated Output Capacity per unit : 12.39 MW
    Turbine Axis Level : 2450.00 masl
    Net Head : 728.369m
    Discharge per unit : 2.0 m3/s
    Efficiency : 90%

    15. Governor

    Type : Electro-hydraulic
    Sensitivity : 0.01%
    Accuracy : 95-100%

    16. Generator

    Type : Salient pole, synchronous
    Capacity : 14730 KVA
    Capacity @ 10% intermittent. OL : 16203 KVA
    Power Factor : 0.85
    Generator Voltage : 11 kV
    Generator Current : 858.25 A
    Frequency : 50Hz
    Class of Insulation : F
    Protection : IP54
    Excitation System Type : Brushless
    Efficiency : ≥ 96%
    Heating class : B
    Number of Poles : 8
    Synchronous Speed : 750 rpm

    17. Transformer

    Number of Transformers : Two (2), Three Phase
    Type : Outdoor, oil immersed
    Cooling : ONAN
    Rating : 16.36 MVA
    Rated Voltage : Primary side – 11 kV and Secondary Side -132 kV
    Maximum Voltage (Line to Line) : Primary side – 12 kV and Secondary Side -145 kV
    Current on HV side and LV side : HV side 71.55 A and LV side 858.70 A
    Type of Tap changing : Off Load on High Voltage side
    Tap Changing Range : ±10% in Steps of 2.5
    Principal tapping : 132 kV
    Vector Group reference : YNd11
    Efficiency : ≥ 99 %