1. Project Location
Development Region : Eastern
Zone : Mechi
District : Panchthar
Headworks Site : Auletar,Yangnam -1
Powerhouse Site : Bharapa VDC
Geographical Co-ordinates
Latitude : 87° 47′ 42” E to 87° 50′ 58” E
Longitude : 27° 10′ 09″ N to 27° 11′ 33” N
2. General
Name of river : Hewa Khola
Nearest town : Phidim
Type of Scheme : Run-of-River
Gross Head : 192.5m
Installed Capacity : 1,2000 kW
Average Annual Energy after Outage : 68.418 GWh
3. Hydrology
Catchment Area : 205 Km2
Mean Annual Discharge : 11.89 m3/s
Design Discharge : 8.12 m3/s (40 % PoE)
Riparian Release : 0.233 m3/sec
Design Flood Discharge : 852 m3/s (50 Yr. flood)
4.Headworks
Type of Diversion Weir : Ogee shaped
Length of Weir : 31.50 m
Height of Weir : 2.75 m (From River Bed)
Crest Elevation : 867.50
Intake Type : Side Intake
Size of Orifice : (2.00 m x 1.75 m) x 2 Nos.
Sill Level of Intake : 866.00 m
5.Approach Canal
Type of Approach Canal : RCC Rectangular
Length : 18.28 m
Size : 5.00 m x 3.00 m
Longitudinal Slope : 1 in 1000
6. Desanding Basin
Type : RCC, Gravity flushing type
No of Basin : 3 (Three)
Dimension (L x B x H) m : 65.00 m x 6.50 m x 4.63 m each
Transition Length ( Inlet) : 30 m
Particle Size to be settled : > 0.20 mm
7. Headrace Tunnel
Type : Inverted D shaped
Length : 3233.00 m
Size : 3.50 m x 3.50 m (Width x Depth)
Slope : 1:1000
8. Forebay
Type : Circular RCC lined
Size ( D x H) : 8.11 m x 12.82 m
Normal Water Level : 862.523 m amsl
9. Penstock Pipe
Type : Steel Pipe (Surface)
Length : 485.00 m
Internal Diameter : 1750 mm
Thickness : 8mm ~ 16 mm
10. Powerhouse
Type : Surface
Size ( L x B) : 30.00 m x 20.00 m
Turbine Centre Level : 675.00 m amsl
11. Tailrace Canal
Type : Rectangular, Stone Masonry
Length : 50 m
Size : 1.5 m x 2.0 m (Width x Depth)
12.Turbine
Type : Horizontal Axis, Pelton
Number : Two (2)
Rated Output Capacity per Unit : 6500 kW
Efficiency : 91%
13. Governor
Type : Server motor actuated PID electronic flow governor
Adjustment for speed Droop : Between 0 to 5%
14. Generator
Type : Synchronous, Three phase
Rated output capacity per unit : 7650 kVA
Power factor : 0.85
Generating Voltage : 11 kV
Frequency : 50 Hz.
No of units : Two
Excitation system : Brushless
Efficiency : 96%
15. Transformer
Type : 3 Phase, Oil Immersed
Cooling Type : ONAN
No. of Units : Two (2)
Rated Capacity : 7500 kVA each
Voltage ratio : 132/11 kV
Efficiency : 99%
Tap Changer : off load, ± 5% steps of ± 2.50 %
16. Transmission Line to be Constructed by Company
Voltage Level : 132 kV
Length (approx.) : 5.0 Km
From : Powerhouse (HKHEP)
To : Phidim Sub- station
Conductor : ACSR “WOLF”
17. Total Cost of the Project : NRs. 176.012 Million
18. Project Construction Period : : 36 months
19. Other
Facilities for Black Start, Off Grid Mode Operation or Local Grid Mode Operation shall be incorporated in the project.
Note: Dimensions given above are approximate values. Dimensions and other minor details given above which do not adversely effect the performance of the Project as required by or envisaged in this PPA, may change during detail engineering and construction phase, provided that such deviations/changes are approved by Coordinating Commitee.