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 is driven by the turbine shaft through bevel gears. Oil pump is a positive displacement type of pump like gear pump or axial piston pump. Based mfchanism quantity of water available Run-off river plants without pondage. Space between guide vanes will increase in one direction of rotation of regulating ring and space will decrease in its opposite direction of rotation.
C engine Cylinder Piston Connecting rod. It receives the pressurized oil from pump which is diverted towards the ports connected to pipe A or pipe B. 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. The piston of the cylinder will be displaced towards left, thus forcing gpverning oil through the pipe B into the relay valve and finally to oil sump.
The load on turbine is not constant through out the day or govedning, hence speed of turbine varies with respect to load at constant head and discharge. Download ppt “Presentation on: Excess govrening above the full reservoir level flows over gurbine crest in the form of rolling sheet of water.
It discharge the overflow water to downstream goevrning when the reservoir is full. The governing mechanism is disconnected from the system so that the experiments are performed at constant gate openings.
It is a circular ring having guide vanes pivoted at a tjrbine through the levers and links. Useful on parts of load curve. Power is proportional to angular speed. Total volume of discharge upto any time, given by the area under the curve upto the time. It prevents debris from water. The behaviour of the units are represented by curves called turbine characteristics.
Consequently, the rate of flow is decreased and normal speed is o.
Proportional or directional valves controlled by the governor govefning 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. Since H is constant, the peripheral speed of the turbine is constant and therefore, the discharge is independent of speed. When N is zero, the angular speed is zero and when N equals runaway speed, the output power is again zero.
Glverning speed regulation is known as governing and it is usually done automatically by a governor.
The rapid closing of the nozzle increases the pressure of water which may result in water hammer problems. A flow duration curve can be improved upon by storing water on the upstream side and using it during off peak period.
Governing of Pelton Turbine.doc
It is directly connected to the piston of relay cylinder Governor and linkages: Penstock Valves and Gates. It receives oil from relay valve say through pipe A. Auth with social network: A centrifugal governor is used as the measuring element of the closed loop control system. Simultaneously, the oil will be returned from the servomotor from the opposite pipe to the sump. It can be seen by this mechanism, the linear motion of servomotor piston is converted into rotary motion of regulating ring.
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It also trapezoidal in shape with wide base. Home Governing of Pelton Turbine. A flow-duration curve may be used for determination of minimum and maximum condition of flow. Thus, it is essential that the exact behavior of the unit under varying working conditions is predetermined. The movement of bell crank lever brings the deflector in front of the jet. No suction downside, water flows out through turbine housing after hitting.
Its lower end is turned at right angle and horizontally taken out of dam.
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My presentations Profile Feedback Log out. The characteristics of turbines are obtained under three different categories-‘ a Main characteristics Head constant b Operating characteristics Speed constant c Governkng curves Efficiency constant A. We are a non-profit group that run this website to share documents. These curves are used in determination of the capacity of storage reservoir.
Once the normal turbine speed is restored, the main lever returns to its initial position. Governing of Pelton WheelTurbine.