Chaira, Bulgaria - 01
Chaira, Bulgaria - 02
Project: Pumped storage hydropower plant Chaira, Bulgaria
Year: 2019 – 2022
Scope of work: Modernization of the 4 reversible Francis turbines
The modernization of the units involves:
- Improving the efficiency by modifying the hydraulic contour of the runner
- Stopping water leakage by modifying the wicket gates system
- Renewing the corrosion protection
- Replacing the cooling water system
- Replacing the high-pressure oil unit
| No. of units | 4 |
| Nominal output (pump/turbine) [MW] | 197 / 216 |
| Maximum discharge (turbine mode) [m³/s] | 36,1 |
| Nominal net head [m] | 676,8 |
| Nominal speed [rpm] | 600 |
| Runner diameter [mm] | 3600 |
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