Pump - Turbine Specifications

Type:

Vertical shaft, single stage, single runner, Francis pump-turbine

Turbine:

Head: 213-227 m | | Rated head: 213 m

Discharge: 112-120 m3/s

Output: 115-250 MW | | Rated output: 250 MW

Speed: 300 rpm

Pump:

Head: 210-239

Discharge: 79-97 m3/s

Input: 202-217 MW

Speed: 300 rpm

Specific speed: 50 m- m3/s

Hydraulic Vibration and Stability Analyses

Hydraulic vibration and stability had been analyzed in frequency domain.

Self Excited Vibrations

Self excited vibrations had been analyzed. System designed to prevent them.

Auto-Oscillations of the Ball Valve

Auto-Oscillations of the Ball Valve's Sealing Ring was analyzed. System designed to prevent resonance.

Papers, Studies, Analyses, Troubleshooting, Simulations,…

Penstock Valve Resonance

 

In the pump storage power plant, shown schematically in Figure 4 and Error! Reference source not found. self-excited oscillations of the ball valve had occurred when both units were out of operation and the ball valves were closed.

 

The resonance was caused by an inoperative ball valve. Serious damage was prevented by prompt intervention of the staff. When the oscillations took place, an oscillography was installed on the spot and the amplitudes of pressure oscillations in the surge tank chamber, shown in Error! Reference source not found. were, measured.

 

The reason was insufficient-sealing pressure in the ball valve (a spool valve has been damaged by cavitation).

 

Long waterways are very sensitive to resonance as shown in Error! Reference source not found..

 


Text Box: Figure 1 Pump storage plant Capljina. Self-excited oscillations of the ball valve had occurred. Aeration valve in the surge tank chamber damaged.

 

Article:

1.     Karney B., Gajic A., Pejovic S., Case Studies – Our Experience in Hydraulic Transients and Vibrations, Proceedings of the International Conference on CSHS03,,Belgrade, 2003.

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