Technical Features of San Roque Hydroelectric Power Plant
(Click the image for the item details.)
Hydrology
| Drainage area |
1,250 km2 |
| Average flow |
83.6 cms |
| Design flood (Probable maximum flood) |
12,800 cms (10,000 year return period) |
Reservoir
| Capacity (El. 280.0) |
835 million cubic meters |
| Capacity (El. 290.0) |
955 million cubic meters |
| Active storage |
525 million cubic meters |
| Dead storage |
310 million cubic meters |
| Flood surcharge (El. 280-290) |
120 million cubic meters |
| Surface area at maximum normal water level |
12.8 km2 |
| Maximum normal water level |
El. 280 masl |
| Maximum exceptional water level |
El. 290 masl |
| Minimum normal water level |
El. 225 masl |
Dam
| Type |
Central clay core rockfill dam |
| Maximum height |
200 m |
| Crest level |
El. 295 masl (plus 2 m camber) |
| Fill volume (including cofferdams) |
40 million cubic meters (approximate) |
| Dam length |
1.13 km |
| Slope |
2h:1v (upstream & downstream) |
| Crest width |
12 m |
Spillway
| Type |
Concrete chute |
| Number of gates, type |
6, Hydraulically operated radial gates |
| Crest elevation |
El. 270 masl |
| Capacity |
12,800 cms with reservoir @ El. 289.3 |
Power Tunnel
| Size, lining, length |
8.5 m diameter (concrete-lined) |
|
8.2 m to 3.5 m diameter (steel-lined) |
|
1.3 km long |
| Number of gates, type |
2 wheel gates with 2 slide-type guard gates |
Turbines
| Turbine type |
Vertical Shaft Francis |
| Units |
3 |
| Maximum normal gross head |
180 m |
| Minimum gross head |
125 m |
| Rated head |
150.4 m |
| Installed capacity |
435 MW |
| Flow range (1 to 3 Units) |
40 to >270 cms |
Generators
| Generator Type |
3 vertical shaft, semi-umbrella synchronous generator |
| Rated output |
150,000 kVA |
| Rated voltage |
13,800 V |
| Frequency |
60 Hz |
| Synchronous speed |
225 rev/min |
| Number of poles |
32 |
Power Transmission
| Switchyard type |
Step-up 13.8 to 230 kV |
| Line Type |
Double circuit |
| Length |
9 km |
Low Level Outlet
| Size, lining, length |
5.5 m diameter, concrete lined, 1.3 km long |
| Number of gates, type |
3 slide gates with 3 guard gates |
| Flow range |
90 to >480 cms |
