Podcast
Questions and Answers
What is the function of the governor in a steam turbine?
What is the function of the governor in a steam turbine?
- It monitors the overall efficiency of the turbine
- It regulates the temperature of the turbine
- It generates steam for the turbine
- It controls the speed and power output of the turbine at various load conditions (correct)
How does the governor respond when the turbine load increases?
How does the governor respond when the turbine load increases?
- By decreasing the steam flow to the turbine nozzles
- By shutting off steam supply to the turbine
- By admitting more steam to the turbine nozzles (correct)
- By increasing the turbine speed
What method do most turbine governors use to sense turbine shaft speed?
What method do most turbine governors use to sense turbine shaft speed?
- Magnetic means
- Mechanical means (correct)
- Electrical means
- Hydraulic means
In which type of governing system do flyweights move in accordance with changes in turbine speed?
In which type of governing system do flyweights move in accordance with changes in turbine speed?
What is the role of flyweights in a purely mechanical governing system?
What is the role of flyweights in a purely mechanical governing system?
How does the governor respond when the turbine load decreases?
How does the governor respond when the turbine load decreases?
What is the primary purpose of adjusting the steam control valve in a steam turbine?
What is the primary purpose of adjusting the steam control valve in a steam turbine?
What causes the flyweights of a mechanical hydraulic governor to move outwards?
What causes the flyweights of a mechanical hydraulic governor to move outwards?
How does the flyweight-operated oil relay governing system respond to an increase in turbine speed?
How does the flyweight-operated oil relay governing system respond to an increase in turbine speed?
In a hydraulic turbine governing system, what varies with turbine speed to supply hydraulic oil through two passages to the pressure relay?
In a hydraulic turbine governing system, what varies with turbine speed to supply hydraulic oil through two passages to the pressure relay?
What prevents the force on the operating cylinder bellows from varying in a hydraulic turbine governing system?
What prevents the force on the operating cylinder bellows from varying in a hydraulic turbine governing system?
How does an overspeed trip mechanism protect a turbine against excessive speed?
How does an overspeed trip mechanism protect a turbine against excessive speed?
What happens when a sudden loss of load occurs in a turbine without adequate protection?
What happens when a sudden loss of load occurs in a turbine without adequate protection?
What is the primary element that senses overspeed in a typical overspeed trip mechanism of a small mechanical drive steam turbine?
What is the primary element that senses overspeed in a typical overspeed trip mechanism of a small mechanical drive steam turbine?
What does an increase in turbine load cause in a hydraulic oil relay governing system?
What does an increase in turbine load cause in a hydraulic oil relay governing system?
Study Notes
Governor Function and Response
- The governor in a steam turbine controls the steam flow to maintain a constant speed, regardless of changes in turbine load.
- When the turbine load increases, the governor responds by reducing the steam flow to the turbine, decreasing its speed.
- Conversely, when the turbine load decreases, the governor increases the steam flow, increasing the turbine speed.
Turbine Speed Sensing
- Most turbine governors sense turbine shaft speed using a mechanical or hydraulic system.
Mechanical Governing System
- In a purely mechanical governing system, flyweights move in accordance with changes in turbine speed, regulating the steam flow.
- The flyweights play a crucial role in the mechanical governing system, as they directly control the steam flow valve.
Hydraulic Governing System
- In a hydraulic governing system, the flyweights move outwards due to an increase in turbine speed, causing hydraulic oil to flow through two passages to the pressure relay.
- The pressure relay then adjusts the steam control valve to maintain a constant turbine speed.
Overspeed Protection
- An overspeed trip mechanism protects the turbine against excessive speed by rapidly closing the steam valve and applying a braking mechanism.
- A sudden loss of load without adequate protection can cause the turbine to overspeed, leading to catastrophic failure.
Overspeed Trip Mechanism
- The primary element that senses overspeed in a typical overspeed trip mechanism is a flyweight, which triggers the trip mechanism when the turbine speed exceeds a set limit.
Load Changes and Response
- An increase in turbine load causes the hydraulic oil relay governing system to decrease the steam flow to the turbine, reducing its speed.
- The primary purpose of adjusting the steam control valve is to maintain a constant turbine speed, regardless of changes in load.
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Description
Test your knowledge about the governor, a crucial component of a steam turbine that automatically regulates its speed and power output at different load conditions by controlling the steam flow through the turbine. This quiz covers the principles and mechanisms of turbine governing.
