1. ČKD Blansko Engineering, a.s. IGHEM 2012 Changing the Start-up Procedure of Francis Reversible Pump-Turbine to Improve its Stability in Turbine Mode Zdenek Cepa CKD Blansko Engineering, a.s. 2357 Capkova, 67801 Blansko, Czech Republic

2. Content:  Introduction  Characteristic evaluation of the pump-turbines  Criterion of the S-shaped region  Analysis of S-shaped region  Asynchronous control of two wicket gates  Modified start up procedure of SPP Zarnowiec in Poland  Conclusions ČKD Blansko Engineering, a.s.

3. Local S-shaped regions in equal operating curves ČKD Blansko Engineering, a.s.

4. Four quadrants operation of a radial type pump turbine ČKD Blansko Engineering, a.s.

5. Analysis of the S-shaped region ČKD Blansko Engineering, a.s. Stability condition

6. Main parameters of SPP Zarnowiec in Poland – runner diameter 6000mm Turbine mode: Pumping mode: H max =119.95 m Penstock factor H max =127.1 m H min =101.00 m Discharge at total head 127.1 m Q max =178.5 m 3.s -1 Q max =128.2 m 3.s -1 P max =180 MW P max =178.9 MW ČKD Blansko Engineering, a.s.

7. Company profile ČKD Blansko Engineering, a.s. Turbine condition M 11 =0 Braking condition Pump condition

8. Offered services ČKD Blansko Engineering, a.s. Pump H-Q characteristics, scaled up to the prototype (IEC 60 193) guarantees model tests results Discharge Delivery head [m] c a

9. Automatic start up without modification of butterfly valve automatics ČKD Blansko Engineering, a.s.

10. Stabilizing effect of the butterfly with valve head losses ČKD Blansko Engineering, a.s.

11. Stabilizing effect of the butterfly with valve head losses ČKD Blansko Engineering, a.s.

12. Butterfly valve modified automatics ČKD Blansko Engineering, a.s.

13. Thank you for your attention