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Examoogle • User • info@examoogle.com • EE-2024-8821
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Turbine speed governing system consists of
Flyball speed governor
Hydraulic amplifier and Linkage mechanism
Speed changer
All of above
All of above
Quick Summary: A turbine speed governing system is an automatic control mechanism used to maintain constant turbine speed under varying load conditions. It integrates sensing, amplification, and adjustment components to modulate steam or water flow, ensuring frequency stability in power systems.
A turbine speed governing system is an automatic control mechanism used to maintain constant turbine speed under varying load conditions. It integrates sensing, amplification, and adjustment components to modulate steam or water flow, ensuring frequency stability in power systems.
Δf=−R⋅ΔPg — Primary frequency response equation relating frequency deviation to power generation change
Pm=Kg⋅Δω — Mechanical power output adjustment based on angular speed deviation
The flyball governor acts as the speed sensor, detecting deviations from the setpoint. A linkage mechanism transmits this movement to a hydraulic amplifier (servomotor), which provides the necessary force to actuate the control valves. The speed changer allows manual or automated adjustment of the steady-state speed reference point.
The governor provides primary frequency control in electrical grids.
Hydraulic amplifiers are required because the flyball governor lacks the force to move high-pressure steam valves directly.
The speed changer is used to shift the speed-load characteristic for synchronizing the generator.
Maintains constant frequency
Ensures stable load sharing between parallel generators
Subject to mechanical wear
Time constant delays in hydraulic response
Hydroelectric power plants
Thermal steam turbine stations
The governing system acts on the prime mover to adjust the energy input based on the difference between actual speed and reference speed.
Option A, B, and C are essential parts of the same integrated control loop, making D the correct choice.
D is correct — The turbine speed governing system comprises the speed sensor (flyball governor), the signal/power amplification unit (hydraulic amplifier/linkage), and the reference setpoint adjuster (speed changer).
Remember that the speed changer shifts the droop curve parallel to itself, allowing for load distribution changes without altering the speed regulation (slope).