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| Our Technology |
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The process consists of conversion of the potential energy, embodied in the water flowing from a higher point to a lower point, into mechanical energy and then into electrical energy. The flowing water is guided through a head race tunnel and penstock gate and jetted on to a turbine. This action rotates the turbine, which is connected to a synchronous generator. The rotation of the turbine causes the rotation of the generator thereby producing electricity which after in-house auxiliary consumption, is exported to grid.
Our turbines, the key components of the project, were manufactured by Voith Siemens, the reputed German producer of turbine machinery. Voith Siemens is also the manufacturer and supplier of generators.
The plant is computerized; controlling the aspects of operation, regulation and the monitoring of its activities, through the processors of water intake through to power generation.
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| Technology |
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The most important technological component of the project activity is the turbine and the generator.
The project activity employs Pelton type turbines and brushless, synchronous generators. 2 turbines each coupled to a generator of 4.95 mW output are established in the project activity.
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| Specifications of turbine |
| No. of units |
2 |
| Type |
Horizontal shaft Pelton |
| Rated head |
426 metres |
| Operating speed |
750 rpm |
| Design flow of one unit |
1.35 m3/ sec |
| Installed capacity |
5.15 mW each |
| Runner |
Buckets are made of integrally cast stainless steel
directly coupled to the generator shaft
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| Deflectors |
Jet deflectors to avoid excessive pressure increase in the penstock and proper speed regulation of the unit |
| Other accessories |
Inlet valve
Distributor
Power nozzles and needles
Hydraulic governor with head level sensor
Hydraulic systems |
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| Specifications of generator |
| No. of units |
2 |
| Type |
Brushless, synchronous |
| Duty |
Continuous |
| Shaft |
Continuous |
| Installed capacity |
5.6 mW each |
Rated output of each
unit |
4.95 mW (The generators are designed for maximum output of 4.95 mW for each generator when the generators are in operation) |
| Generating voltage |
6.3 kV |
| Power factor |
0.9-1 |
| Rated speed |
750 rpm |
| Runaway speed |
1320 rpm |
| Generator efficiency |
97.6 % at rated output |
| Protection |
Over/under voltage protection
Over/under frequency protection
Over current protection
Loss of mains protection
Neutral voltage displacement protection
Inter tripping protection |
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| Specifications of other components of the project |
| Weir |
| Type |
Concrete gravity |
| Length |
20 m |
| Height |
1 m |
| Intake conduit |
| Length |
10 m |
| Section |
2m x 1 m |
| Head race channel |
| Length |
280 m |
| Section |
2 m x 1.0m |
| Sedimentation tank |
| Length |
27 m |
| Section |
6 m x 2.7m |
| Forebay tank |
| Capacity |
145 m3 |
| Penstock |
| Length |
2400 m |
| Thickness range |
8 to 16 mm |
| Diameter range |
620 mm to 1118 mm |
| Head loss at full flow |
36 m |
| Expansion joints |
sleeve |
| Power house |
| Type |
RCC and masonry |
| Size |
18 m x 30m |
| Transformer – Step up for grid connection |
| No. of units |
2 |
| Capacity |
6 mVA, 33 kV |
| Transformer – Step down for auxiliary consumption
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| No. of units |
1 |
| Capacity |
100 kVA, 400 V |
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