What is high head and low head in turbine?
It is a vertical height measured in metres. The two diagrams below show how the head would be measured on a typical ‘low head’ and a typical ‘high head’ site. The more head you have the higher the water pressure across the hydro turbine and the more power it will generate.
Which turbine is used for high head?
Pelton turbines
Pelton Turbine Pelton turbines are generally used for very high heads and low flows.
What is the best turbine suitable for high head and low flow rate?
Pelton and Turgo turbines are suitable for high head, which is larger than 50 m, and medium head ranging between 10 and 50 m. Crossflow turbine is suitable for medium and low head, which is less than 10 m.
Which is low head turbine?
Generally speaking, low head turbines produce hydroelectric power where the head of the water is less than 20 meters although the precise definition varies. A hydraulic head is a vertical distance between the intake water level and the discharge water level.
Why Pelton turbine is used for high head?
Pelton turbines are used for electricity generation in hydraulic power plants. They are suitable for operation when water energy is available at high head and low flow rate. In a Pelton turbine, the energy extracted from the kinetic energy of the water is used for the rotation of the impeller.
Which turbine is used for low head power plant?
Since they can reach very high rotation speeds, propeller turbines are effective for low heads. Consequently, this type of turbine is suitable for run-of-river power stations.
What is medium head turbine?
The turbines that work under a head of 45m to 250m are called medium head turbines. It requires medium flow of water. Francis turbines are used for medium heads.
What is turbine head?
What is head? Head is the height difference between where the water enters into the hydro system and where it leaves it, measured in metres.
Why Pelton turbine is not suitable for low head?
Pelton turbines are not used at lower heads because their rotational speeds becomes very slow and the runner required is very large and unwieldy.