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Transformer modelling for transient studies Neves, Washington L. A.
Abstract
Transformer modelling is a concern for the utility industry. The object of this work is to develop and investigate dynamic core models suitable for transient studies. A major advantage of the core models developed here is that they use readily available transformer test data as supplied by the manufacturer. For ferroresonance and inrush current studies, core saturation needs to be represented reasonably well. A direct approach to producing nonlinear peak flux-current and voltage-current characteristic of the iron core, taking iron losses into account, is presented. The algorithm is simple in concept, easy to implement, and may be useful for electromagnetic transient programs. A crude estimation of the transformer open circuit capacitance is also made from rated frequency data. It is useful for situations in which the transformer exciting current experiences strong capacitive effects. An iterative algorithm for more correctly representing the flux-linkage curve of a delta-connected transformer, suitable for situations in which the tests are performed with a closed delta, is developed. It uses positive sequence excitation test data as input and takes into consideration the removal of triplen harmonics from the line current. An approach to model frequency-dependent effects in the transformer core from transformer no-load loss data, is presented. Hysteresis and eddy current effects in the core are treated simultaneously. The flux-current trajectories are generated by circuit models with no need to pre-define them. Simulations using the developed models are compared to laboratory measurement of inrush current and to a ferroresonance field test.
Item Metadata
Title |
Transformer modelling for transient studies
|
Creator | |
Publisher |
University of British Columbia
|
Date Issued |
1994
|
Description |
Transformer modelling is a concern for the utility industry. The object of this work
is to develop and investigate dynamic core models suitable for transient studies. A major
advantage of the core models developed here is that they use readily available transformer
test data as supplied by the manufacturer.
For ferroresonance and inrush current studies, core saturation needs to be
represented reasonably well. A direct approach to producing nonlinear peak flux-current
and voltage-current characteristic of the iron core, taking iron losses into account, is
presented. The algorithm is simple in concept, easy to implement, and may be useful for
electromagnetic transient programs. A crude estimation of the transformer open circuit
capacitance is also made from rated frequency data. It is useful for situations in which the
transformer exciting current experiences strong capacitive effects.
An iterative algorithm for more correctly representing the flux-linkage curve of a
delta-connected transformer, suitable for situations in which the tests are performed with a
closed delta, is developed. It uses positive sequence excitation test data as input and takes
into consideration the removal of triplen harmonics from the line current.
An approach to model frequency-dependent effects in the transformer core from
transformer no-load loss data, is presented. Hysteresis and eddy current effects in the core
are treated simultaneously. The flux-current trajectories are generated by circuit models
with no need to pre-define them.
Simulations using the developed models are compared to laboratory measurement
of inrush current and to a ferroresonance field test.
|
Extent |
3075138 bytes
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Genre | |
Type | |
File Format |
application/pdf
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Language |
eng
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Date Available |
2009-06-11
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Provider |
Vancouver : University of British Columbia Library
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Rights |
For non-commercial purposes only, such as research, private study and education. Additional conditions apply, see Terms of Use https://open.library.ubc.ca/terms_of_use.
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DOI |
10.14288/1.0065027
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URI | |
Degree | |
Program | |
Affiliation | |
Degree Grantor |
University of British Columbia
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Graduation Date |
1995-05
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Campus | |
Scholarly Level |
Graduate
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Aggregated Source Repository |
DSpace
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Item Media
Item Citations and Data
Rights
For non-commercial purposes only, such as research, private study and education. Additional conditions apply, see Terms of Use https://open.library.ubc.ca/terms_of_use.