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Chapter 2 Francis Hydro Turbine

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CHAPTER 2 TURBINE UNIT 2.1 Turbine A hydro turbine converts the energy of flowing water into mechanical energy. A hydroelectric generator converts this mechanical energy into electricity. The turbine is designed for direct coupling with three phase 50 Hz suspended type generator as shown in the Fig. 2.1. Fig. 2.1 Turbine. 2.2 Francis hydro turbine The Francis turbine is a type of water turbine that was developed by James B. Francis. It is an inward flow reaction turbine that combines radial flow and axial flow concepts. Francis turbines are the most common water turbine in use today. They operate in a head …show more content…

A pressure gauge is provided for measuring the pressure of clean water supply. Just below the base plate of the turbine sealing a rubber ring is fixed on the shaft flange. This ring presses against taper surface specially provided in the turbine cover when rotor of the unit is lifted upon the jacks. 2.4.0 Water pipe lines The system of water pipelines serves for supplying technical water to guide bearing cooler and oil cooler unit for governor oil system and clean water to turbine sealing. The flow of water to the oil cooler of governor oil system is maintained automatically by an electromagnetic valve and globe valve which facilitates repairs and servicing. A pressure gauge located after the electromagnetic valve indicates the pressure of the cooling water being fed to the oil cooler. Another pipe carries technical water to the guide bearing oil cooler, on the outlet pipe from the guide bearing cooler, a flow failure relay has been provided to give a signal in case of flow-failure through the pipe. The outlet pipe discharges water from the cooler into the drainage channel. 2.4.1 Oil pipe lines of the governing

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