1. Location

(i)   State

:

Bihar

(ii)  District

:

Supaul

(iii) Block

:

Nirmali

(iv) Village

:

Nirmali

(v)  River

:

Tiljuga Dhar

1.1 Project Area

(i)   Latitude

:

N 26⁰ 21’

(ii)  Longitude

:

E 86⁰ 36’

(iii) Access to the project

:

Nirmali Road on Kosi Embankment

(iv) Nearest village near power house

:

Nirmali

(v)  Nearest Rail Head

:

Nirmali

(vi) Port

:

Kolkata

(vii)Airport

:

Patna

2.  Scheme Type

:

Run of the River

3.  Hydrology

(i) Maximum Annual Rain Fall

:

2191 mm

(ii) Minimum Annual Rail Fall

:

1291 mm

(iii) Maximum Intensity (one day) at Birpur

:

318.5 mm

(iv) High Floor Discharge

:

1700 cumecs

4.  Power Potential

(i) Gross Head

:

4.50 m

(ii) Net Head

:

3.50 m

(iii) Discharge available for power generation

:

450 m³/sec (During Monsoon)

225 m³/sec (During Non-Monsoon)

112.50 m³/sec (During Lean Season)

(iv) Installed Capacity

:

4x1.75 MW

5.  Diversion Structure

(i) Type

:

Gated Weir

(ii) Size

:

132 m(W)x 34 m(L) x 9.2m (H)

(iii) No. of Gates

:

17 Nos.

(iv) Size of Gates

:

6.25 m (W) x 5 m(H)

(v) Type

:

Vertical lift

(vi) Thickness of each pier

:

1.50 m

6.  Power House

(i) Type

:

Surface

(ii) Size

:

50 m (L) x 25 m (W) x 22.50 m (H) above generator Floor of 48.00m

(iii) Service Bay Level

:

EL 59.00 m

(iv) Machine Hall Floor Level

:

EL 48.0 m

(v)  Installed Capacity

:

4 x 1.75 = 7.0 MW

7.  Turbine

(i) Type

:

Horizontal Axis S-Type Tubular Turbine

(ii) Rated Discharge

:

56.25 m³/s per machine

(iii) Number of Turbines

:

4

(iv) Installed Capacity

:

4x 1.75 = 7 MW

(v) Rotational Speed

:

120 rpm

8. Generator

(i) Type

:

Horizontal Axis Synchronous Coupled to the turbine through a speed increasing gearbox

(ii) Capacity

:

2.06 MVA

(iii) Number of machines

:

4

(iv) Power Factor

:

0.85

(v) Frequency

:

50 Hz

(vi) Number of Phases

:

3

(vii) Voltage

:

3.3 kV

9. Step Up Transformer

:

(i) Type

:

Outdoor type self cooled

(ii) Quantity

:

2

(iii) Capacity

:

4.80 MVA

(iv) Voltage Ratio

:

3.3/ 33 kV

10. Speed Increasing Gearbox

(i) Speed on Turbine Side

:

120 rpm

(ii) Speed on Generator Side

:

750 rpm