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A 15.088 km long, 10.50 m dia circular
concrete lined Head Race Tunnel. ( The
Intake structure has already been constructed at the outfall of Rail Race
Tunnel from Power House of NJHEP at Jhakri).
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A 155.75 m high, 38 m dia,
restricted orifice type, open to sky Surge Shaft.
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A Butterfly Valve House – 69 m long, 10.50 m wide and 23 m high,
housing three Butterfly Valves each of 5.4 m dia.
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3 Nos circular steel lined partly underground Penstocks
of lengths 440 m middle penstock, 472 m right penstock
and 454 m left penstock each Penstock bifurcating into two
branch tunnels of 3.80 m dia each to feed Six Generating Units.
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A surface type Power House of size
158 m (L) x 34.50 m (W) x 48 m (H) to house
6 vertical axis francis turbines generating units of
68.67 mw each, to utilize a net head of 119.10 m and design
discharge of 383.88 cumecs.
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A 67.94 m long, 10.50 m dia standard horse shoe type, concrete lined,
Tail Race Tunnel with open channel.
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Energy generation of 1770 Gwh
during a 90 % dependable year, with 95 %
machine availability.
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The power generated from the project would be evacuated by LILO of
400 KV Jhakri – Nalagarh D/C line at village Duttnagar near Rampur
Bushahr.
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1. Location
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State
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Himachal Pradesh
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District
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Shimla/Kullu
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River
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Satluj
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Village
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Near Village Bael
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2. Hydrology
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Catchment Area at Nathpa
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49820km˛
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Catchment Area at Rampur (G&D Side)
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50880 km˛
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Average Annual run off in 50% Average year
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10181.22 Mm3
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3. Intake Structure
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Normal Pond Level
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1005m
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Minimum Pond level
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1002m
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Number of Intake Gates
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2(6m wide x 7m high)
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4. Intake Tunnel
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Type
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Circular, concrete lined
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Size
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10.15m/10.50m dia
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Length
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484m
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5. Intake Conduit/(cut & cover)
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Type
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Circular, concrete lined
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Length
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43.2m
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6. Head Race Tunnel
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Type
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Circular, Concrete Lined
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Size
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10.50m finished diameter
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Length
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15.088 km
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Velocity
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4.43m/sec
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7. Adits
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Nos.
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5
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Size
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Dia of each 7.5m,
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Lengths
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Left Bank adit 328m, Kajo adit 795m, Kunni adit 604m, Goshai adit 1090m and
Bayal adit 483m
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8. Surge Shaft
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Type
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Restricted Orifice type Open to sky
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Height
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155.75m
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Diameter
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38m
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9. Penstocks
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Numbers
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Three number bifurcating X6
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Size
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5.40/3.80m circular, steel lined
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Type
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Partly
Underground
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Length
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Middle 440m, Right 472m and left 454m
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10. Butterfly Valve House
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Nos., Size of Valve
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3 Nos. , 5.4m internal dia
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11. Salient Features of Gates |
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a. Surge Shaft Gates
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Size of the gate |
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4.4m x 6.6m |
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Size of the gate shaft
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5.4m x 1.15m |
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Nos.
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3 Nos. |
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Type of Hoist
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Rope Drum Hoist |
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Sealing
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u/s skinplate and d/s sealing |
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Operation |
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Raising under balance water head condition and
lowering under differential water head of 5m. |
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Purpose of Gate |
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To facilitate repair and maintenance of d/s valves
and pressure shafts/penstocks |
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b. Draft Tube Gates
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Size of the gate |
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7.81m x 3.591m |
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Nos.
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6 Nos. |
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Type of Hoist
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Rope Drum Hoist |
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Sealing
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d/s skinplate and d/s sealing |
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Operation |
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Raising under balance water head condition and
lowering under unbalanced water head conditions. |
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Purpose of Gate |
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To facilitate repair and maintenance of generating
units and Draft Tubes by isolating respective Draft Tubes from
tailrace tunnel waters. |
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c. TRT Gates
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Size of the gate |
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7.5m x 4.33m |
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Nos.
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3 Nos. |
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Type of Hoist
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Rope Drum Hoist |
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Sealing
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u/s skinplate and u/s sealing |
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Operation |
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Raising and lowering under unbalanced water head
conditions. |
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Purpose of Gate |
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To isolate the flow from river side into the
Tailrace Tunnel during high flood. |
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d. ADIT Gate at Goshai
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Size of the gate |
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2.5m x 2.5m |
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Nos.
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1 No. |
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Type of Gate |
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Hinged Type (hoist not required) |
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Sealing
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u/s skinplate and d/s sealing |
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Purpose of Gate |
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To facilitate future inspection , repair and
maintenance of Rampur Headrace Tunnel. |
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e. Spill Tunnel Gate
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Size of the gate |
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10.15m x 10.15m |
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Nos.
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1 No. |
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Type of Hoist
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Rope Drum Hoist |
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Sealing
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u/s skinplate and u/s sealing |
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Purpose of Gate |
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To isolate the flow from river side into the Spill
Tunnel during high flood. |
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12. Powerhouse Complex
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Type
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Surface
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Installed Capacity
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412 MW
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Size
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158m L x 34.5m W
x 48m High
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Nos. of Units
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6
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Type of turbines
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Francis,
vertical axis
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Speed of turbines
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214.3 RPM
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Generators
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6x68.67 MW, 0.9 pf, 11 Kv
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Gross head
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138.7m
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Net head
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119.10m
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Design Discharge
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383.88 cumecs
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13. Tail Race Tunnel/Channel
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Type
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Horse Shoe Concrete lined /
Trapezoidal
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Size
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10.5m dia
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Length
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67.945m
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Max.TWL
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866.70m
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Min.TWL
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862.90m
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14. Outfall Arrangement
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No. of gates
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3
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Size of gates
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7.5m widex4.33m
high
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15. Switchyard
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Size & type
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Surface, 400 KV
GIS Switch Gear
Double bus bars arrangement
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16. Power Generation
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Annual Energy generation in a 90% dependable year with 95% machine availability
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1770 Gwh
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Annual Plant Load Factor
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49.04 %
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17. Construction Programme (from the date of sanction)
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Unit-1
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55 months
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Unit-2
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56 months
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Unit-3
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57 months
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Unit-4
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58 months
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Unit-5
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59 months
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Unit-6
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60 months
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