Runner with bucket: – runner of Pelton wheel consists of a circular disc on Governing mechanism: – speed of turbine runner is required to be. This speed should also conforms to the power supply frequency. So this mechanism acts as a speed governing mechanism of Pelton wheel. Presentation on:Governing of Pelton WheelTurbine pump with oil sump Relay or control valve Servomotor with spear rod and spear Deflector mechanism.
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It constructed if rainfall occurs only for few months in a year and the remainder periods are dry. The behaviour of the units are represented by curves called turbine characteristics. Download ppt “Presentation on: To make this website work, we log user data and share it with processors. Usually, hydraulic turbines are coupled to electronic generators. The outlet is a specially shaped draft tube that helps decelerate the water and recover kinetic energy.
Pelton wheel, Cross Flow e. These type of plants are suitable as peak load plants at locations where there is a storage of water since these plants mechanisj designed such that it pumps back portion of its water supply from tail race to head race during non- peak periods.
Governing of Pelton Turbine.doc
Fly ball of the governor moves upward, 2. The forward motion of the spear reduces mecyanism opening of the nozzle. Guide vanes direct the water tangentially to the runner. Capital cost required is low. If you wish to download it, please recommend it to your friends in any social system. It gives relation between flows and lengths of time during which they are available. Transmission Hydraulic Systems Chapter 4 Introduction How the transmission develops hydraulic pressure How transmission generates, regulates and modifies.
In this case, the head is turbkne constant and the speed is varied by varying the load on the turbine.
We are a non-profit group that run this website to share documents. Please copy and paste this embed governin to where you want to embed Embed Script. It consists of l turbime servomotor, 2 relay valve or control valve, mchanism actuator centrifugal governor4 oil sump, turgine oil pump and 6 oil supply pipes. Proportional or directional mwchanism controlled by the governor operate cylinders that open and close wicket gates or needle valves to adjust the flow of water to the turbine in order to maintain a constant turbine speed.
The governing achieved by changing the guide vane angles. 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 govegning on the balls. It connects the regulating ring to relay cylinder through the various linkages as shown in fig. Oil under pressure is forced from the control valve to the right side of the piston in the servomotor, 6. If governor proportional or directional valves do not respond instantly and accurately to fluctuating generator loads, there is a lagging behind of the wicket or needle valve position.
The physical parameters controlling the performance of a turbine are speed N, power output P, head H, discharge Q, the position of gate opening nozzle opening or guide blade opening G, and the efficiency of the turbine. Home Governing of Pelton Turbine. It store water when load is light and supplied same water during peak period. Please help us to share our service with your friends.
Registration Forgot your password? It will Simultaneously more the spear valve to the left and increase the area of flow through the nozzle.
Runaway speed is the speed at which the turbine exceeds its designed maximum rotational speed. Since H is constant, the peripheral jechanism of the turbine is constant and therefore, the discharge is independent of speed. Runner placed directly in the water stream flowing over the blades rather than striking each individually.
Bell crank lever moves down and simultaneously the piston of the control valve moves down in the cylinder. Hydrograph provides following information: These generators are required to run at constant speed irrespective of variations in the head and power output. The discharge at any time during the period under consideration. It ot the graphical representation between discharge and flow with time.
High head, low pdlton applications. The water stream hits each bucket on the runner. Furthermore, if this oscillation exceeds the maximum allowable frequency, then the turbine must be shut down, resulting in temporary loss of generating production.
We think you have liked this presentation. Working The centrifugal governor actuator is driven by the turbine shaft through a belt or gear.
Presentation on:Governing of Pelton WheelTurbine – ppt video online download
It receives oil from relay valve say through pipe A. Report “Governing of Pelton Turbine. It receives the pressurised oil from the oil pump which is diverted towards the ports to pipe A or pipe B.