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Chapter 16: Problem 2

State the main differences between steamturbine generators and salient-pole generators. For a given power output, which of these machines is the larger?

Short Answer

Expert verified
The main differences between steam turbine generators and salient-pole generators are: 1. Rotor structure: Steam turbine generators have a smooth cylindrical rotor, while salient-pole generators have protruding poles on their rotor. 2. Applications: Steam turbine generators are commonly used in large power plants, whereas salient-pole generators are used in hydroelectric power plants or small-scale applications. 3. Operating speed: Steam turbine generators usually have a higher operating speed (1500-3600 RPM) compared to salient-pole generators (usually below 1500 RPM). 4. Efficiency: Steam turbine generators tend to have higher efficiency due to their smooth rotor surface and reduced air resistance and eddy current losses. For a given power output, steam turbine generators are generally smaller than salient-pole generators due to their smooth rotor design and higher operating speeds, allowing them to generate more power in a smaller package.

Step by step solution

01

Steam turbine generator

Steam turbine generators are a type of generator that uses steam from a boiler to power a turbine, which then turns an alternator to generate electricity. Steam turbine generators are typically used in large power plants for electricity generation like nuclear, coal, or natural gas power plants. The steam turbine generators usually have a shaft speed ranging between 1500 and 3600 RPM. They generally have a cylindrical rotor construction with slots for the windings, which results in a smooth rotor surface. This smooth surface improves the machine's efficiency by reducing air resistance and losses due to eddy currents.
02

Salient-pole generator

Salient-pole generators are synchronous generators with protruding magnetic poles on their rotor. These protruding poles (salient poles) contain field windings that generate a magnetic field when a current flows through them. Salient-pole generators are commonly used in applications like hydroelectric power plants, where they can operate at lower speeds (usually below 1500 RPM). Due to their construction and salient poles, these generators experience higher air resistance and losses due to eddy currents.
03

Differences between steam turbine generators and salient-pole generators

1. Rotor structure: Steam turbine generators have a smooth cylindrical rotor, while salient-pole generators have protruding poles on their rotor. 2. Applications: Steam turbine generators are commonly used in large power plants, whereas salient-pole generators are used in hydroelectric power plants or small-scale applications. 3. Operating speed: Steam turbine generators usually have a higher operating speed (1500-3600 RPM) compared to salient-pole generators (usually below 1500 RPM). 4. Efficiency: Steam turbine generators tend to have higher efficiency due to their smooth rotor surface and reduced air resistance and eddy current losses.
04

Size comparison for a given power output

For a given power output, steam turbine generators are generally smaller than salient-pole generators. The smooth rotor design and higher operating speeds of steam turbine generators allow them to generate more power in a smaller package, whereas salient-pole generators require larger windings and pole structures to achieve the same power output.

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Key Concepts

These are the key concepts you need to understand to accurately answer the question.

Steam Turbine Generators
Steam turbine generators are an integral component of large power plants. They function by utilizing steam produced in a boiler which is then used to spin a turbine. This spinning turbine turns an alternator to produce electricity. These generators are typically found in power plants using nuclear, coal, or natural gas as their energy source.

Some characteristics of steam turbine generators include:
  • Shaft speeds that vary from 1500 to 3600 revolutions per minute (RPM)
  • They possess a smooth cylindrical rotor that minimizes air resistance
  • The design reduces losses incurred by eddy currents, thus increasing efficiency
This combination of features makes them highly efficient and suitable for large-scale electricity generation in power stations.
Salient-Pole Generators
Salient-pole generators, a type of synchronous generator, are distinct due to the protruding magnetic poles on their rotor. These poles have field windings that create a magnetic field necessary for electricity production when they carry electrical current.

These generators are often used in environments:
  • Like hydroelectric power plants
  • Where lower operational speeds (typically below 1500 RPM) are required
The design features of salient-pole generators contribute to higher air resistance and eddy current losses, affecting their efficiency compared to their steam turbine counterparts. However, they are well-suited to certain applications because of their specific characteristics.
Synchronous Generators
Synchronous generators, which include both steam turbine and salient-pole generators, operate based on the principles of synchrony between the rotor and the electrical grid. This means their rotor's rotational speed is synchronized with the grid's frequency.

Here are some key aspects of synchronous generators:
  • They can provide stable power output, making them preferable for grid applications
  • They are capable of adjusting power factor through excitation control
  • This adaptability helps in efficient electricity distribution and transmission
Despite operational differences, both generator types follow these synchronous principles to fulfill their roles within power systems.
Power Plants
Power plants, the heart of electricity production, employ various types of generators depending on the energy source and needs. They can range from large-scale operations like nuclear and fossil fuel plants, using steam turbine generators, to smaller-scale hydroelectric stations utilizing salient-pole generators.

Key points to understand about power plants:
  • They are designed to meet specific electricity demands using available resources
  • The choice of generator type impacts the efficiency and output capacity of the plant
  • Operational goals determine whether high-speed steam turbines or low-speed salient-poles are best suited for a particular application
Power plants systematically harness energy resources to generate electricity, fueling various sectors, from residential to industrial.

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Most popular questions from this chapter

Referring to Fig. 4 , each coil on the rotor has \(21.5\) turns, and carries a dc current of \(500 \mathrm{~A}\). Knowing that the air gap length is \(1.3\) inches, calculate the flux density in the air gap at no-load. Neglect the mmf required for the iron portion of the magnetic circuit.

In analyzing a hydropower site, it is found that the turbines should turn at close to \(350 \mathrm{r} / \mathrm{min}\). If the directly coupled generators must generate a frequency of \(60 \mathrm{~Hz}\), calculate the following: a. The number of poles on the rotor b. The exact turbine speed

What are the advantages of using a stationary armature in large synchronous generators? Why is the stator always connected in wye?

A \(33.8 \mathrm{kVA}, 480 \mathrm{~V}, 3\)-phase, \(60 \mathrm{~Hz}\), diesel- driven emergency alternator is designed to operate at a power factor of 80 percent. The following additional information is given: Efficiency: \(83.4 \%\) Weight: \(730 \mathrm{lb}\) \(\mathrm{Wk}^{2}\) (moment of inertia): \(15.7 \mathrm{lb} \cdot \mathrm{ft}^{2}\) Insulation: class B Calculate a. The minimum horsepower rating of the diesel engine to drive the generator b. The maximum allowable temperature of the windings, using the resistance method

What conditions must be met before a generator can be connected to a 3 -phase system?
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