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INDEX

CONTENTS Page No:

ABSTRACT i

LIST OF FIGURES ii

LIST OF TABLES iii

CHAPTER-1: NTPC: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2

CHAPTER-2: GENERATOR: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-4

2.1 working principle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

2.2 construction details and design . . . . . . . . . . . . . . . . . . . . . . . . 3

CHAPTER-3: GENERATOR PROTECTION: . . . . . . . . . . . . . . . . . . . . . . . . .5-13

3.1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

3.2. General requirements for the protection of relays . . . . . . . . . . 5

3.3. Generator protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

3.4. Inadvertent Energization of generator . . . . . . . . . . . . . . . . . . . . 12

CHAPTER-4: EXCITATION:. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14-31

4.1Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

4.2 Components of brushless excitation system . . . . . . . . . . . . . . . . 18

4.3 Brushless excitation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

4.4 Digital voltage regulator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

CONCLUSION: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32

REFERENCES: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33

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ABSTRACT

This project is about generator protection and excitation

system which is carried out in thermal power station. There are

different protective systems available to the generator for

protecting the generator under abnormal conditions. It also

improves the life of the generator.

Excitation is used in generator for obtaining the voltage

across the terminals. This excitation is varied in order to acquire

required output voltage across the terminals. There are various

techniques in providing an excitation to the generator which is

given in this project.

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LIST OF FIGURES: Pg.No

1. Main parts of Turbo Generator. 04

2. Stator earth fault protection. 09

3. Stator earth fault protection. 13

4. Basic arrangement of Brushless Excitation system. 20

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LIST OF TABLES: PG.NO:

1. NTPC 2

2. Generator stator faults 6

3. Generator rotor faults 7

4. Unit Aux. Transformers faults: 7

5. Generator Transformers faults: 7

6. Types of generator: 10

7. Specifications of 200MW alternator in stage1: 15

8. Static excitation systems: 16

a) Rectifier transformer 16

b) Rectifier assembly: 16

C) Automatic Voltage Regulator: 16