Podcast
Questions and Answers
What is the main function of the governor in a steam turbine?
What is the main function of the governor in a steam turbine?
- To regulate the speed and power output of the turbine (correct)
- To generate steam for the turbine
- To transfer mechanical energy to electrical energy
- To cool down the turbine during operation
How does the governor respond when the turbine load increases?
How does the governor respond when the turbine load increases?
- By decreasing the amount of steam admitted to the turbine nozzles
- By shutting off the steam supply completely
- By increasing the turbine speed
- By admitting more steam to the turbine nozzles (correct)
What type of system are flyweight governing systems?
What type of system are flyweight governing systems?
- Purely mechanical or mechanical-hydraulic (correct)
- Gas-powered system
- High-pressure steam system
- Electronic control system
How does a purely mechanical governor in a flyweight governing system apply force to the steam governor valve?
How does a purely mechanical governor in a flyweight governing system apply force to the steam governor valve?
What does the governor sense to regulate the turbine speed?
What does the governor sense to regulate the turbine speed?
What happens to the turbine speed when the turbine load increases?
What happens to the turbine speed when the turbine load increases?
What is the function of the trip-throttle valve?
What is the function of the trip-throttle valve?
What can happen if a turbine is not protected against rotating at excessive speed?
What can happen if a turbine is not protected against rotating at excessive speed?
What is the primary element that senses overspeed in the turbine?
What is the primary element that senses overspeed in the turbine?
What action does the trip pin take if the rotational speed of the turbine shaft increases to trip speed?
What action does the trip pin take if the rotational speed of the turbine shaft increases to trip speed?
What is the purpose of the flyweight assembly in a mechanical hydraulic governor?
What is the purpose of the flyweight assembly in a mechanical hydraulic governor?
How does an increase in turbine speed affect the governor sleeve in the flyweight-operated oil relay governing system?
How does an increase in turbine speed affect the governor sleeve in the flyweight-operated oil relay governing system?
In the hydraulic turbine governing system, what is the purpose of the hand speed changer?
In the hydraulic turbine governing system, what is the purpose of the hand speed changer?
What effect does lowering the pilot valve have in the flyweight-operated oil relay governing system?
What effect does lowering the pilot valve have in the flyweight-operated oil relay governing system?
What maintains a constant oil pressure downstream of the orifice in the hydraulic turbine governing system?
What maintains a constant oil pressure downstream of the orifice in the hydraulic turbine governing system?
Study Notes
Governor Function in Steam Turbine
- The main function of the governor is to regulate the turbine speed by controlling the steam flow.
Governor Response to Load Increase
- When the turbine load increases, the governor responds by reducing the steam flow to maintain a constant speed.
Flyweight Governing Systems
- Flyweight governing systems are mechanical-hydraulic systems.
Mechanical Governor in Flyweight System
- A purely mechanical governor in a flyweight governing system applies force to the steam governor valve through a linkage attached to a rotating flyweight, which is connected to the turbine shaft.
Speed Regulation
- The governor senses the turbine speed to regulate it.
Turbine Speed under Load Increase
- When the turbine load increases, the turbine speed decreases.
Trip-Throttle Valve Function
- The trip-throttle valve is a safety device that closes the steam valve to shut down the turbine in case of overspeed.
Consequences of Excessive Speed
- If a turbine is not protected against rotating at excessive speed, it can cause mechanical failure, vibration, and even break apart.
Overspeed Sensing
- The primary element that senses overspeed in the turbine is the flyweight assembly.
Trip Pin Action
- If the rotational speed of the turbine shaft increases to trip speed, the trip pin takes action by releasing the trip-throttle valve to shut down the turbine.
Flyweight Assembly Purpose
- The purpose of the flyweight assembly in a mechanical hydraulic governor is to sense the turbine speed and regulate the steam flow.
Governor Sleeve Response
- An increase in turbine speed causes the governor sleeve in the flyweight-operated oil relay governing system to move upwards.
Hand Speed Changer Purpose
- In the hydraulic turbine governing system, the purpose of the hand speed changer is to manually adjust the turbine speed.
Pilot Valve Effect
- Lowering the pilot valve in the flyweight-operated oil relay governing system increases the oil pressure, which in turn increases the steam flow.
Oil Pressure Regulation
- A constant oil pressure downstream of the orifice in the hydraulic turbine governing system is maintained by the orifice and the accumulator.
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Description
Test your knowledge about the governor, a crucial component of a steam turbine that automatically regulates speed and power output at varying load conditions by controlling steam flow. Learn about how the governor responds to changes in turbine load.
