Salient Features

GENERAL INFORMATION

 

Project Type

Run-of-River

Installed Capacity

2.60 MW

Number of units

2

Gross head

124.50 m

Net energy

14.38 GWh

 

HYDROLOGY

 

Catchment area

81.00 km²

Average annual flow

5.77 m³/s

Design discharge

2.7 m³/s

Minimum monthly flow

1.10 m³/s

Compensation flow

90.00 l/s

Project design floods

 

20-years

130.00 m³/s

100-years

325.00 m³/s

500-years

460.00 m³/s

 

HEADWORKS

 

Weir

 

Weir length

36m

Weir crest level

952.50 m amsl

Weir height (Above river bed)

2.00 m

Weir discharge capacity

368.00 m³/s

Intake

 

Bottom orifice sill level

951.50 m amsl

Intake orifice size

1.50 m x 0.30 m (2 x 4 nos)

Design discharge including gravel flushing and sediment flushing

368.00 m³/s

Maximum intake capacity

8.00 m³/s

Intake culvert

 

Total length

60.00 m

Canal slope

1 in 50

Size

1.29 x 2.20 m with 0.25 m freeboard at 100 years flood

Gravel trap

 

Length (including transition)

18.40 m

Width

4.00 m

Settling length

20.00 m

Flushing discharge

0.80 m³/s

Flushing gate

1 no. size 0.60m x 0.75m

Particle size to be settled

5mm

Gravel flushing channel

 

Type

Rectangular with hard stone lining

Length

12.50 m

Width

1.00 m x 1.50 m

Slope

1:35

Pipe Crossing

 

Truss bridge length

30.00 m

Pipe crossing

40 m long 1300 dia 6 mm thick MS pipe

Approach canal

 

Length

220.00 m

Size

1.60 m x 1.50 m

Slope

1:530

Settling basin

 

Length (including transition)

77.00 m

Settling chambers

2 nos., 4.50 m wide each

Settling length

45.00 m

Flushing discharge

1.08 m³/s

Particle size to be settled

0.2 mm

Particle trapping efficiency

90%

Sediment flushing gate size

2 nos. 0.6m x 0.6m

Sediment flushing channel

 

Type

Rectangular

Length

23.00 m

Size

1.20 m x 1.00 m

Slope

1:30

Forebay

 

Size

10.00 m x 10.50 m x 5.60 m

Pressure Pipe

 

Type

Buried and exposed

Material

GRP and mild steel

Total length

25.50 m

Internal diameter

1200mm and 1300mm

 

POWERHOUSE

 

Type

Surface

Size

18.00 m wide and 24.00 long

Turbine axis level

825.50 m amsl

 

TAILRACE

 

Type

Open canal structure

Length

43.00 m

Tail water level

819.00 m amsl

 

ELECTRO-MECHANICAL EQUIPMENTS

 

Turbine

 

Turbine type

Turgo

Model

XJA – 60A/2 x14.5

Number of units

2 nos.

Rated capacity

1317 kW each

Efficiency

85%

Turbine inlet valve

Gate valve

Powerhouse crane

Overhead travelling crane

Capacity

10 tons

Generator

 

Model

SFW 1250-10/ 1430

Rated Output

1250 kW each

Rated frequency

50 hz

Rated Current

143.2 A

Rated Voltage

6300 V

Power factor

0.8

Rated speed

750 rpm

Insulation Degree

F/F

Main Transformer

 

Model

S93150-11/6.3

Rated Capacity

3150 kVA

Voltage

6.3 kV to 11 kV

Service Power Transformer

 

Model

S9-M-63/6kV

Rated Capacity

63 kVA

Excitation Transformer

 

Model

ZSJ-50/ 6 kVA

Rated capacity

50 kVA

Transmission line

 

Line length

6.3km long, 11kV, single circuit

Switchyard

17 m x 15 m (approx.)

 

POWER AND ENERGY

 

Design discharge

2.70 m³/s

Gross head

125.5 m

Net head at full flow

117.5 m

Installed capcity

2.6 MW

Total energy per year

14.38 GWh

Power evacuation

At 11 kV Sunkoshi Substation, Phurketar, Lamosanghu, NEA HT switchboard 11 kV, 25 kA with copper Bus bar rated 2000 A consisting of incomer panel


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