Details
| Original language | English |
|---|---|
| Title of host publication | ICHVE 2012 - 2012 International Conference on High Voltage Engineering and Application |
| Pages | 600-603 |
| Number of pages | 4 |
| Publication status | Published - 2012 |
| Event | 2012 International Conference on High Voltage Engineering and Application, ICHVE 2012 - Shanghai, China Duration: 17 Sept 2012 → 20 Sept 2012 |
Publication series
| Name | ICHVE 2012 - 2012 International Conference on High Voltage Engineering and Application |
|---|
Abstract
The lumped transformer equivalent circuit has been recently adapted based on duality principle and verified for the purposes of transient analysis with reasonable accuracy and frequency response analysis. However such circuit is developed and validated for balanced and unbalanced three-phase excitation. On the other hand, several diagnostic tests such as Frequency Response Analysis (FRA), ratio, short-circuit impedance measurements etc. are performed only under single-phase excitation in open- and short-circuit conditions. Therefore, there is a requirement to develop an equivalent circuit for power transformers under single-phase excitation to analyse relevant tests, which has not been completely investigated until now. The required equivalent circuit should in general include all windings of three phases as suggested by several recent publications since the influence from other non-tested windings to the tested phase winding was confirmed. The paper's main contribution is to introduce a duality-principle-based lumped equivalent circuit for a three-phase two-winding transformer under single-phase excitation at low frequencies for the purpose of impedance and frequency response analyses. More importantly, a method for determining internal, i.e. per-phase, parameters of the circuit based on impedance tests is also proposed. Results show that, thanks to frequency-dependent functions of the parameters and their connection in the circuit, inter-phase effect and quantitative interpretation of several first parallel- and series resonances in frequency response of winding impedances in transformer bulk are now possible. Furthermore, these physical parameters can be useful as input for machine-learning algorithms to diagnose transformer failures.
ASJC Scopus subject areas
- Engineering(all)
- Electrical and Electronic Engineering
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ICHVE 2012 - 2012 International Conference on High Voltage Engineering and Application. 2012. p. 600-603 6357097 (ICHVE 2012 - 2012 International Conference on High Voltage Engineering and Application).
Research output: Chapter in book/report/conference proceeding › Conference contribution › Research › peer review
}
TY - GEN
T1 - Duality-based lumped transformer equivalent circuit at low frequencies under single-phase excitation
AU - Pham, D. A.K.
AU - Pham, T. M.T.
AU - Ho, V. N.C.
AU - Borsi, H.
AU - Gockenbach, Ernst
N1 - Copyright: Copyright 2013 Elsevier B.V., All rights reserved.
PY - 2012
Y1 - 2012
N2 - The lumped transformer equivalent circuit has been recently adapted based on duality principle and verified for the purposes of transient analysis with reasonable accuracy and frequency response analysis. However such circuit is developed and validated for balanced and unbalanced three-phase excitation. On the other hand, several diagnostic tests such as Frequency Response Analysis (FRA), ratio, short-circuit impedance measurements etc. are performed only under single-phase excitation in open- and short-circuit conditions. Therefore, there is a requirement to develop an equivalent circuit for power transformers under single-phase excitation to analyse relevant tests, which has not been completely investigated until now. The required equivalent circuit should in general include all windings of three phases as suggested by several recent publications since the influence from other non-tested windings to the tested phase winding was confirmed. The paper's main contribution is to introduce a duality-principle-based lumped equivalent circuit for a three-phase two-winding transformer under single-phase excitation at low frequencies for the purpose of impedance and frequency response analyses. More importantly, a method for determining internal, i.e. per-phase, parameters of the circuit based on impedance tests is also proposed. Results show that, thanks to frequency-dependent functions of the parameters and their connection in the circuit, inter-phase effect and quantitative interpretation of several first parallel- and series resonances in frequency response of winding impedances in transformer bulk are now possible. Furthermore, these physical parameters can be useful as input for machine-learning algorithms to diagnose transformer failures.
AB - The lumped transformer equivalent circuit has been recently adapted based on duality principle and verified for the purposes of transient analysis with reasonable accuracy and frequency response analysis. However such circuit is developed and validated for balanced and unbalanced three-phase excitation. On the other hand, several diagnostic tests such as Frequency Response Analysis (FRA), ratio, short-circuit impedance measurements etc. are performed only under single-phase excitation in open- and short-circuit conditions. Therefore, there is a requirement to develop an equivalent circuit for power transformers under single-phase excitation to analyse relevant tests, which has not been completely investigated until now. The required equivalent circuit should in general include all windings of three phases as suggested by several recent publications since the influence from other non-tested windings to the tested phase winding was confirmed. The paper's main contribution is to introduce a duality-principle-based lumped equivalent circuit for a three-phase two-winding transformer under single-phase excitation at low frequencies for the purpose of impedance and frequency response analyses. More importantly, a method for determining internal, i.e. per-phase, parameters of the circuit based on impedance tests is also proposed. Results show that, thanks to frequency-dependent functions of the parameters and their connection in the circuit, inter-phase effect and quantitative interpretation of several first parallel- and series resonances in frequency response of winding impedances in transformer bulk are now possible. Furthermore, these physical parameters can be useful as input for machine-learning algorithms to diagnose transformer failures.
UR - http://www.scopus.com/inward/record.url?scp=84871576732&partnerID=8YFLogxK
U2 - 10.1109/ICHVE.2012.6357097
DO - 10.1109/ICHVE.2012.6357097
M3 - Conference contribution
AN - SCOPUS:84871576732
SN - 9781467347464
T3 - ICHVE 2012 - 2012 International Conference on High Voltage Engineering and Application
SP - 600
EP - 603
BT - ICHVE 2012 - 2012 International Conference on High Voltage Engineering and Application
T2 - 2012 International Conference on High Voltage Engineering and Application, ICHVE 2012
Y2 - 17 September 2012 through 20 September 2012
ER -