Digital Protection Of Power Transformer Using Microcontroller-Based Relay
In this thesis the fault types m the power transformer as well as their protection scheme have been studied, and the factors which lead to mal operation of differential protection such as : magnetizing inrush, over excitation, ratio mismatch and current transformer saturation have been investigat...
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| Format: | Thesis |
| Language: | English English |
| Published: |
2002
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| Subjects: | |
| Online Access: | http://psasir.upm.edu.my/id/eprint/12111/1/FK_2002_74.pdf |
| Summary: | In this thesis the fault types m the power transformer as well as their protection scheme
have been studied, and the factors which lead to mal operation of differential protection
such as : magnetizing inrush, over excitation, ratio mismatch and current transformer
saturation have been investigated. The existing methods of discriminating internal faults
from inrush magnetizing condition have been reviewed.
A method to discriminate internal fault from inrush current depended on the rate of
change of primary current with respect to time at the first quarter cycle has been used in
this work.
The percentage differential protection, over current protection, over voltage protection
and under voltage protection are implemented m a microcontroller-based system. The
design implementation and testing of the system are also presented. The performance of the system was checked in the laboratory. The experimental results gave a good
agreement with the theoretical ones. |
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