BOOK_CONTENT
From Electrical Equipment Handbook: Troubleshooting and Maintenance

SYNCHRONOUS GENERATORS (CHAP. 12)

1.

Are the cores in the stator and rotor of all generators laminated?

2.

What are the advantages and disadvantages of each excitation method?

3.

What is the mechanical speed of rotation of a synchronous generator?

4.

What are the applications of low-speed generators?

5.

What are the parameters that affect the magnitude of the generator voltage?

6.

Does the mechanical power delivered by the turbine (torque speed) generate the reactive power in the generator?

7.

What are stray losses?

8.

What is the efficiency of a typical large generator?

9.

Why are large generators cooled by hydrogen?

10.

What are the modes of operation of a generator?

11.

What is the effect of a load increase on a synchronous generator operating alone (islanding mode)?

12.

What is the automatic voltage regulator of a synchronous generator?

13.

What are the conditions required to synchronize a generator to a grid?

14.

What is the speed drooping of a turbine-generator governing system?

15.

What is the voltage-reactive power drooping characteristic of a synchronous generator?

16.

What are the consequences of synchronizing a generator to a grid when the frequency of the generator is slightly less than the grid frequency?

17.

What is the capability diagram of a synchronous generator?

Answers

1.

The cores in the stator and rotor of small generators are laminated. However, the rotor of large generators is not. It is made of a single forging. The reason for this is that large rotors are...

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Electrical Power Generators
Electrical power generators, also known as alternators, transform mechanical energy into electrical energy.  They can be used for backup or emergency power or as an alternator on board a vehicle. Generators can produce either AC or DC power and are typically powered by a fuel engine.
Electrical Winding Services
Companies that specialize in the fabrication of custom wound assemblies for a wide range of electrical applications and industries. Electrical winding services also includes the repair and refurbishing of individual wound components.
Flywheel Power Systems
Flywheel power systems are flywheel rotors with integrated motor / generators contained inside a housing. They store energy mechanically in the form of kinetic energy.
Comb Generators
Comb generators create harmonic frequencies from which one frequency can be selected with a narrow filter and filtered out.
Power Frequency Converters
Power frequency converters take electrical input power at one frequency and voltage and provide electrical output power at a different frequency and at a different or equal voltage.

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