1. | General | ||
---|---|---|---|
Name of the Project | Tamor Mewa Hydroelectric Project | ||
Name of River | Tamor and Mewa | ||
Type of Scheme | Run-of-the-River (RoR) | ||
District | Taplejung | ||
Geographical Co-ordinates | |||
Latitude | 27°20’00’’N, 27°24’08’’N | ||
Longitude | 87°37’15’’E, 87°40’00’’E | ||
Nearest Town | Phungling | ||
Access Road Name | Mechi Highway | ||
2. | Organization | ||
Developer | Spark Hydroelectric Company Limited | ||
3. | Hydrology | ||
Catchment Area | Tamor- 2062 km2 | ||
Mewa- 574 km2 | |||
Discharge (at 40%PoE) | Tamor- 95.38 m3/s | ||
Mewa- 34.18 m3/s | |||
4. | Sediment Study | ||
Average annual Sediment load | 9.41 Million Tons/year | ||
5 | Geology | ||
Regional Geology | Lesser Himalaya, Taplejung window | ||
Major Rock Types in Headworks | Mewa: Augen Gneiss Tamor: schist, phyllite, quartzite, Granatic Gneiss | ||
Major Rock Type in Waterways | Mewa: Mica Schist, Tamor: schist, phyllite, and quartzite intercalation | ||
Major Rock Type in Powerhouse | Granitic Gneiss | ||
6. | Structures | ||
Dam/Weir | Tamor Scheme | Mewa Scheme | |
Type | Gated Barrage | Concrete Overflow | |
Length | 85 m | 45 m | |
Provision of stilling Basin | Simple rectangular | Simple rectangular | |
Diversion During Construction | |||
Construction flood | 665 m3/s | 390 m3/s | |
Diversion Type | Embankment | Embankment | |
Sluicing | |||
Number of bays | Spillway Gate: 4 Undersluice Gate: 2 | 2 |
|
Dimension (B x H) | Spillway: 10m x 7m Undersluice: 10m x 12m | 5m x 4m |
|
Gate type | Radial | Vertical Lift | |
Intake Structure | |||
Type of Intake | Submerged Concrete orifice | Submerged Concrete orifice |
|
Nos of Opening | 6 | 4 | |
Size of Intake (B x H) | 5m x 5m | 4m x 2.5m | |
Gate Type | Vertical Lift Gate | Vertical Lift Gate | |
Hoisting System | Rope Drum Hoist | Rope Drum Hoist | |
Trashrack size (B x H) | 5m x 5m | 4m x 2.5m | |
Clear opening of trash rack | 32 mm | 32 mm | |
Trash Cleaning Mechanism | TRCM | Manual | |
Gravel Trap | |||
Type | RCC Rectangular | ||
Number of Bays | 3 | ||
Gravel Trap Size (L x B x H, m) | 32 x 8 x 8 | ||
Size of Flushing Canal (B x H, m) | 2 x 2 | ||
Connecting Canal | |||
Size (L x B x H, m) | 62 x 4 x 8 | ||
Desander | |||
Type | Dufour | Dufour | |
Particle Size to be settled | 0.2 mm | 0.5 mm | |
Settling Efficiency | 90 % | 90 % | |
Number of Bays | 3 | 1 | |
Dimension (L x B x H, m) | 160 x 30 x 12 | 80 x 16 x 5 | |
Inlet Transition Length | 45 | 15 | |
Flushing system | Intermittent | Intermittent | |
Size of flushing channel ( B x H, m) | 1 x 1 | 1 x 1 | |
Headrace | |||
Type | Headrace Tunnel | Steel Headrace pipe and Headrace Tunnel | |
Material | Concrete and shotcrete lined | Steel Pipe and shotcrete lined | |
Length | 4.78 km | 306 m Pipe and 2616 m Tunnel | |
Dimension | 7m dia. Horseshoe | Pipe: 3m dia. circular | |
Tunnel: 4.05m dia. inverted D | |||
Surge Shaft | |||
Type | Restricted orifice | ||
Internal Diameter | 15 m | ||
Height | 58m | ||
Penstock /Pressure Shaft | |||
Type | Underground | Surface | |
Material | Steel lined | Steel pipe | |
Internal Diameter | 5.75m | 3.0m | |
Length | 155m | 120m | |
Steel Thickness | 20 - 36mm | 12mm | |
Powerhouse | |||
Type | Underground | ||
Size (L x B x H,m ) | 80 x 20 x 29 | ||
Overhead hoisting type | EOT Crane | ||
Overhead hoist capacity | 140 Ton | ||
Support type | Shotcrete and rockbolt | ||
Tailrace | |||
Type | Underground | ||
Number | 1 | ||
Dimension | 7.6m dia. Horseshoe | ||
Length | 270 m | ||
7. | Turbine | ||
Type | Vertical axis Francis | ||
Number | 3 | ||
Rated Output Capacity per unit | 44.00 MW | ||
Gross Head | 124.50 m | ||
Discharge per Unit | 42 m3/s | ||
Efficiency | 92% | ||
8. | Generator | ||
Type | Synchronous | ||
Synchronous Speed | 300 rpm | ||
Rated Output Capacity per Unit | 50.30 MVA | ||
Power Factor | 0.85 over-excited | ||
Generation Voltage | 11 kV | ||
Frequency | 50 Hz | ||
No of Units | 3 | ||
Excitation System | Static with microprocessor based digital AVR | ||
Efficiency | 97% | ||
9. | Transformer | ||
Type | Indoor type single phase | ||
Rated Capacity | 17 MVA each | ||
Voltage Ratio | 220/√3/11kV | ||
No of Units | 10 (including 1 spare) | ||
Vector Group | Ynd5 solidly earthed | ||
Frequency | 50 Hz | ||
Efficiency | 99% | ||
10. | Transmission Line | ||
Voltage Level | 220 kV double circuit | ||
Length | 6.3 km | ||
Conductor Type | 2*BISON | ||
From | PH switchyard | ||
To | Dhungesaghu Substation | ||
11. | Power and Energy | ||
Design Discharge | 129.56 m3/s | ||
Gross head | 124.5 m | ||
Installed Capacity | 128 MW | ||
Total Energy | 719.11 GWh |