|THE USE OF A RUBBER DAM IN THE SYSTEM OF THE HYDROELECTRIC POWER PLANT FUNCTION|
A rubber dam is a rubber membrane filled with water or air, attached to the concrete sill. In the upright – full position it serves as a barrier which impounds water.
A rubber dam functions as a barrier in the river where we want to use running water as a drive for a hydroelectric power plant or we want to use the river for field irrigation.
While constructing a hydroelectric power plant the height of the fall of the water down to the turbine is of great significance, as the power of a hydroelectric power plant is calculated in the following way:
P = Q x h x ε
P = power of hydroelectric power plant
h = height of fall to turbine
ε = turbine performance
Generally, it is true that the power of a hydroelectric power plant depends also on the speed of the river and that the power expressed in percentage increases more at the rivers where the fall is smaller. The percentage of the increase of the power is calculated in the following way:
%P = the percentage of the increase of power in a hydroelectric power plant
h2 = the height of the increase of the fall in a hydroelectric power plant
h1 = the initial height of the fall in a hydroelectric power plant
The advantages of use of a rubber dam:
The increase of power of a hydroelectric power plant
A rubber dam restrains very fine sand and deposits which could damage the turbine.
If water gets to high, the rubber weir reacts quickly by lowering and enabling high water to pass. In this way it prevents damage and possible flooding to the engine room of the plant.
The rubber weir at the hydroelectric power plant Soteska (the river Sava Bohinjka) during the storm of September 2007 and afterwards.
- No rusting, no maintenance necessary (painting, lubrication etc.).
- Relatively easy – low-priced adjustment of the height of the weir.
- Functions reliably.
- The possibility of automated functioning without electric power.
- Due to its flexibility it withstands also very high waters.
- High life expectancy. A rubber dam can be used for 20 years and more.
Rubber weirs (five segments, 50 m in length and 1.1 m in height) at the river Sava in Kranj in front of the hydroelectric power plant Majdičev log.