Salient features of Purulia pumped storage project
|
Installed capacity |
4 x 225MW |
Peak operation duration |
Six hours |
Maximum power discharge |
600m3/sec |
Effective head |
177m |
Upstream reservoir |
|
Catchment area |
9.5km2 |
Full reservoir level (FRL) |
516m |
Minimum draw down level |
494m |
Dam height from rock foundation |
71m |
Dam crest length |
1505m |
Reservoir area at FRL |
1.04km2 |
Total storage capacity |
16.5Mm3 |
(a) Live storage |
13Mm3 |
(b) Dead storage |
3.5Mm3 |
Downstream reservoir |
|
Catchment area |
9.5km2 |
Full reservoir level |
337m |
Minimum draw down level |
300m |
Dam height from rock foundation |
95m |
Dam crest length |
310m |
Reservoir area at FRL |
0.53km2 |
Total storage capacity |
16Mm3 |
(a) Live storage |
13Mm3 |
(b) Dead storage |
3Mm3 |
Headrace intake tunnel |
7.7m diameter x 2 |
Penstock |
7.7-7.3m diameter x 2 |
|
4.3m x 4 |
Tailrace |
8.7m diameter x 2 |
|
5.6m diameter x 4 |
Sedimentation rate |
950m3 per ha/year |
Powerhouse |
|
Pump/turbine |
230MW/250MW x 4, Francis type |
Reversible pump turbine, |
250rpm |
Generator/motor |
250MVA/255MW x 4, |
|
Synchronous, 3 phase, |
|
50Hz, pf. 0.9/1.0, 24 poles |
Unit space |
25.5m |
Transformer capacity |
280MVA, 16.5kV/400kV |
Generation voltage |
16.5kV |
Transmission voltage |
400kV |
Construction cost (latest approved cost) |
Approx. US$665M |
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