माथिल्लो त्रिशुली - ३वि
Trishuli Jal Vidhyut Company Limited (TJVCL) is planning to develop Upper Trishuli 3B Hydropower Project (UT3BHEP) with installed capacity of 37 MW located in Nuwakot and Rashuwa District. UT3BHEP is a run-off-river (ROR) type cascade project of Upper Trishuli 3A HEP (60 MW) which lies in the Trishuli River.
Salient Features
Project Location | |||
Province | 3 | ||
Zone / District | Bagmati / Nuwakot and Rasuwa | ||
Intake Site | Kispang Rural Municipality (Nuwakot) and Uttargaya Rural Municipality (Rasuwa) | ||
Powerhouse Site | Kispang Rural Municipality (Nuwakot) | ||
General | |||
Name of River | Trishuli River | ||
Nearest Town | Trishuli Bazar | ||
Type of Scheme | Run-of-River | ||
Maximum Gross Head | 90.0 m | ||
Net Head | 85.37 m | ||
Installed Capacity | 37 MW | ||
Average Annual Energy | 304.78 GWh | ||
Average Annual Energy after Outage | 292.59 GWh | ||
Hydrology | |||
Catchment Area | 4577 km2 | ||
Mean Annual Discharge | 192 m3/sec | ||
Design Discharge (at Q70% PoE) | 51 m3/sec (Tailrace water of Upper Trishuli 3A) | ||
Riparian Release | 3.84 m3/sec | ||
1000 Yrs Flood Discharge | 2718 m3/sec | ||
Headpond (Connected to UT3A Tailrace Pond) | |||
Size | 29 m x 5.2 m to 11.2 m x 7.35 m to 16.8 m | ||
Lowest Bed Level | EL. 712.20 m | ||
Intake | |||
Type | Bellmouth | ||
Intake Invert Level | EL. 714.90 m | ||
Submergence Depth | 6 m | ||
Approach Pressure Conduit | |||
Type | Box Culvert and Steel Pipe embedded in concrete | ||
Box Culvert Length | 276 m | ||
Box Culvert Size | 5.1 m x 5.1 m | ||
Steel Pipe Length | 40 m | ||
Diameter of Pipe | 5.10 m | ||
Headrace Tunnel | |||
Shape | Circular for concrete lined and horseshoe for shotcrete lined section | ||
Length | 3666 m | ||
Diameter | 5.20 m for concrete lined and 6.0 m for shotcrete lined | ||
Portal Invert Level | EL. 714.90 m | ||
Adit Tunnel | |||
Shape | Inverted D | ||
No. of Adit Tunnels | 2 | ||
Length of Adit-1 Tunnel | 463.6 m | ||
Diameter of Adit-1 Tunnel | 4.0 m | ||
Length of Adit-2 Tunnel | 100 m (Indicative) | ||
Diameter of Adit-2 Tunnel | 5.0 m (Indicative) | ||
Surge Tank | |||
Type | Restricted Orifice | ||
Diameter of Tank | 15.0 m | ||
Height | 24.6 m | ||
Throttling Diameter | 2.0 m | ||
Level of Surge Tank Crown | EL. 736.3 m | ||
Bottom Elevation of Surge Tank | EL. 711.7m | ||
Pressure Tunnel After Penstock Stoplog | |||
Section | Circular | ||
Diameter | 4.20 m | ||
Length | 33 m (including transition from square to circular pressure tunnel) | ||
Concrete Lining Thickness | 300 mm | ||
Pipe Shell Thickness | 14 mm | ||
Inclined Shaft | |||
Type | Circular | ||
Diameter | 4.20 m | ||
Length | 100 m | ||
Lining Thickness | 300 mm (Concrete) & 100 mm (Shotcrete) | ||
Pipe Shell Thickness | 14 mm | ||
Pressure Tunnel After Inclined Shaft | |||
Type | Circular | ||
Diameter | 4.20 m | ||
Length | 24.0 m | ||
Lining Thickness | 300 mm | ||
Pipe Shell Thickness | 14 mm | ||
Penstock After Bifurcation (Penstock Manifold) | |||
Type | Circular | ||
Diameter | 3.0 m | ||
Length | 15.0 m (including transition) | ||
Steel Lining | 14.0 mm | ||
Powerhouse | |||
Type | Surface | ||
Size (L x B x H) | 37.60 m x 14 m x 28.2 m | ||
Center line of Turbine | EL. 634.5 m | ||
Tailrace Conduit | |||
Type | RCC, Conduit | ||
Length | 129.6 m | ||
Size (B x H) | 6.7 m x 5.0 m | ||
Tail Water Level | EL. 637.5 m | ||
Turbine | |||
Type | Vertical Axis, Francis | ||
No. of Units | Two (2) | ||
Rated Output Capacity per unit | 19.1 MW | ||
Efficiency | 92.5 % | ||
Governor | |||
Type | Electronic with PID Control | ||
Adjustment for Speed Drop | Between 0 to 5 % | ||
Generator | |||
Type | Synchronous, 3 Phase | ||
No. of Units | Two (2) | ||
Rated Output Capacity per Unit | 22 MVA | ||
Power Factor | 0.85 | ||
Rated Voltage | 11 kV | ||
Frequency | 50 Hz. | ||
Rated Speed | 375 rpm | ||
Excitation System | Static | ||
Efficiency | 97% | ||
Transformer | |||
Type | Outdoor, Oil Immersed, 3 Phase, ONAN | ||
No. of Units | Two (2) | ||
Rated Capacity per Unit | 23 MVA | ||
Frequency | 50 Hz. | ||
Vector Group | YNd 5 | ||
Voltage Ratio | 11 kV/ 132 kV | ||
Efficiency | 99% | ||
Transmission Line | |||
Voltage Level | 132 kV, Single Circuit | ||
Length | 3 km | ||
Conductor | ACSR "BEAR" | ||
From | Powerhouse | ||
To | Proposed Trishuli 3B Hub | ||
Construction Period | 36 months |