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Dong Nai 3 Hydropower Dam.
Generating electricity with installed capacity of 180MW, electricity output of 607.1 mil. kWh/year...

Dong Nai 3 Hydropower Dam


Dong Nai 3 Hydropower Project is located in Dac Nong and Lam Dong provinces.
 1.
      Duties:

-         Generating electricity with installed capacity of 180MW, electricity output of 607.1 mil. kWh per year.  

-         Generating water source for requirements of downstream area, making contribution to increase electricity output for Dong Nai 4 Hydropower Plant and others plants in downstream of Dong Nai river.

-         Making contribution to reduce flood for downstream area, stabilizing lives of people in the area, creating landscape and conditions for navigation and aquaculture, etc.

2.      Salient parameters:

No.

Parameters

Units

Values

A

CATCHMENT AREA

 

 

1

Catchment area

km2

2,441

2

Annual average rainfall

mm

1.95

3

Annual average evaporation

mm

511

4

Runoff

 

 

 

   




 

- Design flood P = 0.1%

m3/s

7,140

 

- Check flood P = 0.02%

m3/s

14,300

 

- Check flood P = 0.1%

m3/s

10,400

 

- Diversion flood P = 0.1%

m3/s

3,500

 

- Annual average discharge

m3/s

79.6

B

RESERVOIR

 

 

1

Reservoir grade

 

I

2

Normal water level (NWL)

m

+590

3

Dead water level (DWL)

m

+570

4

Surcharged water level (SWL) P=0.02%

m

+593,24

5

Storage capacity at NWL

106m3

1,423.6

6

Effective storage capacity

106m3

863.3

7

Reservoir area at NWL

Km2

56

C

MAIN DAM

 

 

1

Structure grade

 

I

2

Dam type

 

RCC

3

Crest elevation

m

595

4

Crest length

m

586.4

5

Crest width

m

10

6

Maximum height

m

108.0

7

Upstream slope

 

0; 0.25

8

Downstream slope

 

0.8

D

SPILLWAY

 

 

1

- Design flood P = 0.1%

m3/s

10,400

2

- Check flood P = 0.02%

m3/s

14,300

3

Spillway type

Gravity concrete

4

Sill elevation

m

574.0

5

Number of span

 

5

6

Opening

m

5x(15x16)

7

Gate dimension

m

15x16

8

Type of energy dissipater

 

Bucket

9

Gate of repairing stoplog

 

 

 

- Quantity

set

1 (divided into 5 sections)

 

- Dimension

m

15x17

 

- Type

 

Slide plane

10

Crane

 

 

 

- Type

 

Loader Crane

 

- Hoisting capacity

T

2x30

 

- Opening

m

5.0

 

- Quantity

set

1

E

POWER LINE

 

 

I

Intake

 

 

1

Design discharge

m3/s

215.0

2

Sill elevation

m

553.0

3

Number of span

 

2

4

Crane

T

125

5

Repairing gate

m

8x8

6

Emergency gate

m

8x8

7

Trashrack

m

8x14

II

Intake tunnel

 

 

1

Type

 

concrete coated

2

Quantity

 

1

3

Diameter

m

8.0

4

Length

m

962

III

Penstock

 

 

1

Type

steel coated tunnel

2

Quantity

 

1

3

Diameter

m

7.0

IV

Hydropower Plant

 

 

1

Structure grade

 

II

2

Type

 

open

3

Maximum discharge

m3/s

215.0

4

Floor elevation of turbine room

m

494.5

5

Elevation of rotor wheel

m

471

6

Dimension

m

25x57

7

Maximum head Hmax

m

116

8

Minimum head Hmin

m

89

9

Design head

m

95.0

10

Mean head

m

98.6

11

Installed capacity

MW

180

12

Assured capacity

MW

56.3

13

Annual average electricity output

106kWh

594.9

14

Assured electricity output

106kWh

502.4

15

Operating hour

h

3,272

16

Turbine

 

 

17

Turbine type

Francis vertical axis

18

Number of unit

 

2x90=180 MW

19

Rated speed

rpm

214.3

20

Crane in turbine room

 

1x250

 

- Hoisting capacity

T

250

 

- Span length

m

21.5

 

- Rail length

m

52

21

Generator

 

 

 

- Type

Synchronous vertical axis

 

- Installed capacity

MW/MVA

90/105,88

 

- Voltage

kV

15.75

 

- Capacity ratio

 

0.85

 

- Speed

rpm

214.3

 

- Number of unit

 

2

22

Main transformer

 

 

 

- Type

Open-air 3-phase

 

- Rated capacity

MVA

106

 

- Voltage

 

220/15.75

 

- Number of unit

 

2

23

Downstream drainage canal

 

 

 

- Length

m

46

 

- Bottom elevation

m

474.3

 

- Bottom width

m

27.36

V

Delivery station

 

 

1

Type

 

Open-air

2

Voltage

kV

220

3

Number of 220kV section

 

4

4

Station dimension

m

88x85+28x10

VI

Synchronous power network

 

 

 

220kV line

Sm x km

2x20 (AC400)

F

COST

 

3,657.758

 

Civil work cost

109VND

1,822.586

 

Equipment cost

109VND

642.486

 

Other costs

109VND

427.501

 

Contingency

109VND

289.257

 

Total cost

109VND

3,181.830

 

Construction capital interest

109VND

475.928

 

3.      Progress:

+ Construction commencement:                                              26/12/2004

 + River closure stage 1, diversion through intake:                      01/2006

 + Construction of main dam of RCC:        from 01/ 04/2007 to 31/03/2009.

 + Completion of main dam construction:                                   31/03/2009

 + Placement of suction pipe:                                                           01/2008

 + Completion of crane installation in turbine room:                       11/2008

 + Completion of installation of mechanical and electrical equipment: 04/2009

 + Reservoir filling:                                                                     30/04/2009

 + Commission of unit No.1:                                                       30/08/2009

 + Commission of unit No.2:                                                       20/10/2009

 + Completion of the project:                                                     end of 2009




(Thu Huyen - www.vncold.vn)

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