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SYNCHRONOUS GENERATORS (CHAP. 12)

By Philip Kiameh
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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