नेपालको पानी जनताको लगानी, हरेक नेपाली विद्युतको शेयरधनी

नेपाल सरकार

ऊर्जा, जलस्रोत तथा सिंचाइ मन्त्रालय

जनताको जलविद्युत कार्यक्रम

जनताको जलविद्युत कार्यक्रम

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