Presentation on:Governing of Pelton WheelTurbine GTU GOVERNMENT ENGINEERING COLLEGE DAHOD Presentation on:Governing of Pelton WheelTurbine

PREPARED BY: chaudhari naranbhai k. 130180119022 Joshi manojkumar k 130180119043 Khaped mohit r. 130180119044 Makawana vijaykumar r 130180119046 Patel kalpeshkumar h. 130180119066 Patel sandip kumar c. 130180119074 Rathwa vikeshbhai k. 130180119089 Rathwa vikeshbhai r. 130180119118 Yadav awdhesh r. 130180119120 Mavi prakash a. 140183119011 Guided by prof.M.B.bariya

Define governing of turbine? The process of providing any arrangement which will keep the speed constant and will regulate the rate of flow( as per variation in load)

Why governing of hydraulic turbines is required????? As turbine is directly coupled to the electric generator which is required to run at constant sped. The load on turbine is not constant through out the day or hour, hence speed of turbine varies with respect to load at constant head and discharge . Therefore in order to have constant speed of generator ,governing of turbine is required to maintain the constant speed of turbine with respect to load.

Key Parts of Pelton Turbine

Multi Jet Distributors for Pelton Wheels

Main part for governing of pelton wheel…. Centrifugal governor Oil pump-gear pump with oil sump Relay or control valve Servomotor with spear rod and spear Deflector mechanism.

Oil pump and oil sump : System uses oil in servomotor or relay cylinder since the force required to actuate the spear valve would be enormous. For this reason, the system requires an oil sump to store the oil and an oil pump to regulate the oil supply in the mechanism. Oil pump is a positive displacement type of pump like gear pump or axial piston pump. lt's function is to pressurize the oil.

Relay or control valve : Relay valve is a spool valve having 5 ports. It is also called as control valve or distributor valve. It receives the pressurised oil from the oil pump which is diverted towards the ports to pipe A or pipe B. Through these pipes the oil is transferred to corresponding sides of double` acting servomotor cylinder. Simultaneously, the oil will be returned from the servomotor from the opposite pipe to the sump.

Servomotor or relay cylinder : It is a double acting cylinder which acts as hydraulic actuator. It receives oil from relay valve say through pipe A. The piston of the cylinder will be displaced towards left, thus forcing the oil through the pipe B into the relay valve and finally to oil sump. It will simultaneously more the spear valve to the left and increase the area of flow through the nozzle.

Governor and linkages : A centrifugal governor is used as the measuring element of the closed loop control system. It is driven by the turbine shaft through bevel gears. The sleeve of the governor is connected through linkages to relay valve. The movement of is transferred through the lever to move the piston rod of relay valve.

Working Consider the case when the load on the generator increases, the speed of the generator and turbine will decreases. Since the governor is driven by the turbine shaft, its speed will also As a consequence, the flyballs of the governor will move inwards due to reduced centrifugal force on the balls. As a result the sleeve of the governor will move downwards.

Working model

Video on governing of pelton wheel

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