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1 Chilime Hydropower Plant on 17th June 2015, 3:37 pm

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Chilime Hydropower Plant


Salient Features

River:Chilime Khola.
Type of scheme:Run of river with peaking pondages
Turbine discharge:7.5m^3/s
Gross head:351.5 m
Net head:337.46 m
Installed capacity:22.1 M W(2*11.05 M W)
Average annual energy:137.9 GWh (137 million units)
Deemed energy:132.9 GWh(132 million units)
Intake size:2*5.50 m*1.2 m
Diversion Weir( L*H):13 m*3.25 m
Sluiceway Width:3.0m
Desanding Basin Type:Dufour (Double Chamber)
Desanding Basin Dimension (L*B*H):60 m* 7.5 m*3.75 m
Syphon (L*D):58 m*2.2 m (Steel Pipe)
Power Canal (L*B*H):606 m* 2.2 m* 2.2 m
Feeder canal with Bemdang khola (L):82.15 m
Peaking pondage Storage Capacity:53032 m^3
Pressure Conduit (L):414 m
Headrace Tunnel (L):2826.5 m
Underground Surge tank (D* H):6.5 m*33 m
Underground Penstock (L*D):635.5 m*1.64 m to 2.17 m
Transformer Cavern (L*W*H):67 m*10 m* 7.5 m
Switchgear Room (L*W*H):14 m* 12 m*8.5 m
Powerhouse Cavern (L*W*H):40 m to 50 m *16 m* 16.5 m
Tailrace tunnel (L*W*H):243 m* 3 m* 3 m
Turbine (Type & output):Horizontal, Pelton (2*11.28 MW) Digital Governor
Generators (Type, Capacity & Voltage):Brushless Excitation, 13 MVA, 11 KV
Transformers (Type, Capacity & Voltage):Single Phase, 4.25 MVA * 7 Nos.
Switch gear Type:Gas Insulatyed Metal Clad (GIS System)
Transmission Line (L*V & Circuit):38 KM * 66 KV Single Circuit (Wolf Conductor)

Performance of Plant

The power plant has very efficient and robust electromechanical equipments, as a result, the plant is able to generate 13.8% excess energy in addition to the deemed energy as per the Power Purchase Agreement with Nepal Electricity Authority. In fiscal year 2067/068, the plant has been successful in delivering chargeable deemed energy 132.79 Gwh, chargeable excess energy of 10.07 Gwh and free excess energy 8.26 Gwh. Insurance of the plant has been made with Rastriya Beema Sansthan.
 
Summary of Plant Status
The hydraulic structures of the plant are in good condition and major repair works have not been required so far. The main equipments have proven to be robust and the whole electromechanical system design has proven to be effective and as per the conditions and practices of the Nepalese system. It is seen from the data that the generation from the plant, for last seven years, has been fairly higher than the deemed generation.

Improvement in the system such as cooling water system, intake trash rack, desander flushing, reservoir flushing, etc., has contributed to the high availability of the plant. As a result the plant has been able to generate excess energy besides deemed energy from the 2nd year of its generation.


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