Table of Contents
- 1 Why is it important that the turbine turns at a constant speed?
- 2 How can we control speed of turbine?
- 3 What is constant speed constant frequency system?
- 4 What is the purpose of a steam turbine governing Mcq?
- 5 Why do we use constant speed?
- 6 How do steam turbines run at constant speed?
- 7 What is the working principle of mordern turbine?
Why is it important that the turbine turns at a constant speed?
When the electric power demand on the generator, or the load, changes, the turbine must respond immediately to keep the speed constant. Since efficient operation requires a careful match between all velocity directions and blade inlet shapes, part-load operation decreases the efficiency of the turbine.
How can we control speed of turbine?
You can control a turbine by controlling the generator speed, blade angle adjustment, and rotation of the entire wind turbine. Blade angle adjustment and turbine rotation are also known as pitch and yaw control, respectively.
What is constant speed constant frequency system?
CSCFS (Constant Speed Constant Frequency Scheme):- If the stator of an induction machine is connected to the power grid and if the rotor is driven above Synchronous speed, Ns, the machine delivers a constant line frequency (f=PNs/120) power to the grid. The slip of the generators is between 0 and 0.05.
Why monitoring and speed control is required in a turbine?
In atomic power station heat is generated through nuclear fusion and water is heated and steam is generated to run the turbine. It is essential to maintain constant speed N(1500 RPM) to maintain the frequency F. Increase/Decrease of frequency affect the domestic set up.
Why must steam turbines be warmed up gradually?
Steam turbines have to be warmed slowly to avoid excessive differential expansion of the various components, rotor stress, and potentially reduced service life.
What is the purpose of a steam turbine governing Mcq?
Explanation: The primary objective of steam turbine governing is to maintain a constant speed at varying loads. That means, irrespective of the load that is developed in the turbine, the speed remains a constant.
Why do we use constant speed?
In order for the velocity to be constant, the magnitude of the velocity (or speed) and the direction of the velocity must not change. Therefore, an object that travels with constant velocity covers the same distance during each time interval and moves in the same direction during the same time interval.
How do steam turbines run at constant speed?
Steam turbines are run at constant speed with the help of governing. The governing system in the turbine regulated the supply of steam for producing shaft work. The load on turbine gets increased by additional load on generator which is coupled to turbine.
How does torque affect power output in a steam turbine?
For rotational systems Power equals Torque times Rotational Speed. Since the speed is constant to increase the power output the torque is increased. In a steam turbine the torque on the rotor is increased by increasing the steam flow into the turbine via the control valves. Hiring CS majors for internships and entry-level roles.
What is meant by the term “governing” of steam turbine?
Governing of steam turbine is the procedure of controlling the flow rate of steam to a steam turbine so as to maintain the speed of the turbine fairly constant irrespective of load on the turbine.
What is the working principle of mordern turbine?
All mordern turbines are equiped with electro hydraulic governors which control the steam flow rates to maintain the constant speed of the machine. For rotational systems Power equals Torque times Rotational Speed. Since the speed is constant to increase the power output the torque is increased.