CONTENTS
Page
Description
Chapter_1
No.
Declaration
ii
Certificate
iii
Dedication
iv
Acknowledgement
v
Contents
vii
List of Tables
ix
List of Figure
x
Nomenclature
xviii
: Introduction
1
1.1
General Introduction
1
1.2
Scope of Work
3
1.3
Thesis Outline
5
Chapter_2
: Review of literature
7
2.1
General
7
2.2
What Causes a Power Transformer Fail?
7
2.3
Transformer Diagnostics and Transformer
15
Maintenance
2.4
Condition Monitoring of Transformers
18
2.5
Comparison of Diagnostic Techniques
21
2.6
Conclusion
22
Chapter_3
: SFRA Basics
23
3.1
Introduction
23
3.2
SFRA Theory
25
3.3
SFRA History
27
3.4
SFRA Today
28
3.5
Purpose of FRA Measurements
29
3.6
Definitions
30
3.7
Development and Variations in FRA Practices
31
3.8
Measurements on Different Winding Types
34
vii
3.9
Conclusion
38
Chapter_4
: SFRA Testing
39
4.1
Introduction
39
4.2
SFRA Test Procedure
39
4.3
Test Circuit and Connections
47
4.4
Test Types
50
4.5
Measurement connection and checks
51
4.6
Conclusion
52
Chapter_5
: Interpretation of SFRA
5.1
Introduction
5.2
Modeling
53
53
of
Transformer
Winding
for
53
Interpretation of SFRA
5.3
Basics of FRA Interpretation
62
5.4
Interpretation Methodology
76
5.5
Examples of FRA Interpretation
83
5.6
Conclusion
87
Chapter_6
: Experimental Work
89
6.1
Design of a Power Transformer
89
6.2
Experimental Set-up
91
6.3
SFRA Testing on Healthy Condition of a
97
Transformer
6.4
Comparison of SFRA Traces at different Tap
105
(Extreme Tap, Normal Tap & Lowest Tap) on the
Healthy Condition of Transformer
6.5
Practical Simulation of Fault Damages
111
6.6
Conclusion
175
Chapter_7
Conclusion
176
7.1
General
176
7.2
Summary of Important Findings
178
7.3
Future Scope of Research Work
185
References
187
List of Publications
192
viii