The Salient Features

1. PLANT
  Type Run-of-River
  Capacity 21.0 MW
  Gross Head 87.50 m
  Design Discharge 29.50 m3/s
  Discharge at 15% Over Load on Rated Capacity 34.74 m3/s
2. LOCATION
  Longitude 76° 34' 06" to 76° 32' 26"
  Latitude 32° 27' 08" to 32° 27' 11"
  State Himachal Pradesh
  District Chamba
  Stream Budhil, a tributary of Ravi river
  Vicinity Near Village Nangli
3. HYDROLOGY
  10-Dily Average Discharge with 90% Dependability 7.02 m3/s
  10-Daily Average Discharge with 75% Dependability 9.08 m3/s
  10-Daily Average Discharge with 50% Dependability 14.58 m3/s
  Discharge for Ecological & Environmental Release 0.64 m3/s
4. TAIL POOL INTAKE
  Type Bell Mouth
  FSL at Tail pool Intake El. 1735.50 m
  MDDL at Tail pool Intake El. 1733.80 m
5. HEAD RACE TUNNEL
  Type and Size Concrete Lined, D - Shaped, 3.6 m Dia Finished.
  Velocity 2.52 m/s
  Length 2687 m
  Design discharge 29.50 cumec.
  Average Slope of Tunnel 1 in 206
6. ADITS
  Adit-I (HRT Portion) D-Shaped, 4.0 m dia Finished & 85 m long
  Adit-II (To Surge Shaft Bottom) D-Shaped, 4.0 m dia Finished & 38 m long
  Adit-III (To Power House Crown) D-Shaped, 4.0 m dia Finished & 43 m long
  Adit-IV (To Pressure Shaft bottom) D-Shaped, 5.6 m dia Finished & 113 m long
  Main Access Tunnel to Power House D-Shaped, 5.6 m dia Finished &150 m long
7. SURGE SHAFT
  Type Restricted Orifice
  Size of Surge Tank 10.0 m Ø Circular & 45.0 m Height
  Size of Orifice 1.8 m Ø Circular Orifice at Bottom
  Invert Level of Surge Tank El. 1711.00 m
  Top Level of Surge Tank El. 1756.00 m
  Max. Upsurge Level El. 1749.50 m
  Min. Down Surge Level El. 1719.10 m
  Type & Surge Shaft Gate Vertical Lift Gate & 3.6 m (W) X 3.6 m (H)
  Size of Air Vent Pipe 300 mmØ, 41.40 m long
8. PRESSURE SHAFT
  Type Underground
  Size Main 1 No. 2.8 m dia, 26.00 m long Horizontal, 85.00 m long vertical pressure shaft & 8.0 m long horizontal at bottom
  Branches 3 nos., 1.65 m dia, 23.5 m each (average length)
  Velocity in Main 4.79 m/s
  Velocity in Branch 4.60 m/s
  Type & thickness of steel liner SAILMA 350, 12 mm to 24 mm thk.
9. POWER HOUSE
  Type Underground
  Installed Capacity 21.0 MW (3 x 7.0 MW)
  Size of Power House including service bay & switch gear room 71.0 m (L) x 15.0 m (W) x 29.65 m (H)
  Service bay Level El. 1653.00 m
  Gross Head 87.50 m (1735.50 - 1648.00)
  Total Head loss (on rated discharge = 29.5 m3/s) 6.20 m
  Rated Net Head 81.30 m (87.50 - 6.20)
  Maximum Net Head 89.01 m (1735.5 - 1646.19 - 0.30)
  Minimum Net Head 78.68 m (1735.50 - 1648.32 - 8.50)
  C/L of Turbine 1645.19 m
  Crane beam level 1661.00 m
  Normal TWL 1648.00 m
10. DRAFT TUBE GATE CHAMBER
  Size of gate chamber 47.0 m (L) X 14.6 m (H) X 6.0 m (W)
  Nos. & Size of Draft tube gate 3 nos. & vertical lift gate 2.4 m x 2.1 m
11. DRAFT TUBE & TAIL RACE TUNNEL
  Draft Tube & Tailrace Tunnelr 3 nos, 2.4 m wide draft tubes merges into one common tail race tunnel of Size 4.0 mØ D-shaped
12. TURBINES
  No. & Type 3, Horizontal Francis
  Rated Power 7.0 MW of each unit
  Overload capacity 15%
  Rated Net Head 81.30 m
  Design Discharge 9.83 cumec of each unit
  Speed 428.6 RPM
13. MAIN INLET VALVE
  Type Butterfly Valve
  Diameter 1500mm
  Design Head 132 m
  Location Power House Cavern
14. GENERATOR
  Type Horizontal Shaft, Salient pole synchronous generator
  Number 3
  Rated Capacity 3 X 7.0 MW
  Overload Capacity 15% COL
  Synchronize Speed 428.6 rpm
15. SWITCH YARD
  Type Surface Switch Yard
  Area 75.0 m X 35 .0 m
  Surface Elevation of Switch Yard El. 1790.00 m
16. TRANSMISSION LINE
  132 kV D/C Harsar I - Bharmour Pooling Station Transmission Line (Ring Main Scheme) 10.80 km
  220 kV S/C from Bharmour Pooling substation near Budhil dam (on left bank D/s of Budhil dam) to interconnecting point with existing 220 kV line near Budhil PH 8.00 km
  220 kV S/C Stringing on Connecting Point- Chamera III Transmission Line 20 km