Simulation of a transformer winding for partial discharge propagation studies

Hettiwatte, S.N.; Crossley, P.A.; Wang, Z.D.; Darwin, A.W.; Edwards, Gary

doi:10.1109/pesw.2002.985244

Cited by 48 publications

(34 citation statements)

References 3 publications

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“…By considering the above conditions, the transfer functions for the location of PD occurrence toward the winding phase (TF L ) and up to the neutral end of the winding (TF N ) is as follows [9]:…”

Section: Multi-conductor Transmission Line Model (Mtl)mentioning

confidence: 99%

Transformer Winding Modeling based on Multi-Conductor Transmission Line Model for Partial Discharge Study

Hosseini¹,

Baravati²

2014

Journal of Electrical Engineering and Technology

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-To study and locate partial discharge(PD) and analyze the transient state of power transformer, there is a need for a high frequency model of transformer winding and calculation of its parameters. Due to the high frequency nature of partial discharge phenomenon, there is a need for an accurate model for this frequency range. To attain this goal, a Multi-Conductor Transmission Line (MTL) model is used in this paper for modeling this transformer winding. In order that the MTL model can properly simulate the transformer behavior within a frequency range it is required that its parameters be accurately calculated. In this paper, all the basic parameters of this model are calculated by the use of Finite Element Method (FEM) for a 20kV winding of a distribution transformer. The comparison of the results obtained from this model with the obtained shape of the waves by the application of PD pulse to the winding in laboratory environment shows the validity and accuracy of this model.

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Section: Multi-conductor Transmission Line Model (Mtl)mentioning

confidence: 99%

Transformer Winding Modeling based on Multi-Conductor Transmission Line Model for Partial Discharge Study

Hosseini¹,

Baravati²

2014

Journal of Electrical Engineering and Technology

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“…For this reason it is helpful and necessary that the propagation of the acoustic wave created by the PD is known. Because there are found only a few publications, which consider analysis of acoustic waves in power transformers [3][4][5][6][7][8][9][10][11][12][13][14], it was recapitulated that the analysis of the acoustic wave propagation in power transformers seems to be lacking; therefore, this was investigated in this work.…”

Section: Introductionmentioning

confidence: 99%

Analysis of Acoustic Wave Propagation in a Power Transformer Model

2009

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Analyses of acoustic wave propagation in a model power transformer are presented in the paper. The acoustic wave is induced by partial discharges that are simulated at predefined coordinates in the core and winding. Propagation of the numerical calculated acoustic wave is analyzed within the transient state. Achieved results indicate that the space and time distributions of the acoustic pressure depend on the induction position. Furthermore, a greater pressure gradient is observed in domains with higher speed of sound while the largest amplitude occurs at the vicinity of the induction position.

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“…It is also employed to study the behaviour of transformer windings under very fast transient overvoltage such as in [61,62] and for studying the propagation of partial discharge pulses as in [63,64]. As mentioned in [65], the concept of MTL refers to a certain number of parallel conductors which transmit electrical signals.…”

Section: Multi-conductor Transmission Line (Mtl)mentioning

confidence: 99%

“…For the inductance matrix L, it is composed of two components which are the inductances due to the external flux linkage L e and internal flux linkage L i of each conductor. The inductance matrix L can be given as (3.6) [61,63]. Equation (3.7) is applied with the assumption that the surrounding medium of the winding is homogeneous and that the electromagnetic field is in transverse mode [65].…”

Section: Ijmentioning

confidence: 99%

Frequency response analysis for transformer winding condition monitoring

Yousof¹,

Fairouz²

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The large power transformer is one of the most expensive assets in a power system network.Special attention needs to be taken to monitor this expensive asset. Among the most critical aspect of a transformer that needs to be monitored is the mechanical condition of the windings and core.One of the best approaches to achieve this is by performing the Frequency Response Analysis (FRA) test on the transformer. The test measures the transfer function response of the transformer winding. If any physical changes occur, it will affect the original response, which can be used to detect any abnormality. However, the critical challenge in this technique is to correctly interpret the measured response in determining the transformer status. Although various investigations have focussed on this issue, the interpretation aspect of FRA is still not fully established.In order to contribute to the improvement of a FRA interpretation scheme, this thesis investigates the sensitivity of FRA measurement on several common winding deformations and explores a new potential diagnostic scheme of FRA. A wide range of power transformers have been used throughout this study ranging from a small sized prototype laboratory transformer to a 30 MVA power transformer installed at a substation.Initially, a mathematical model is established to simulate the frequency response of a power transformer. This is achieved by comparing three models, which are available in the literature.These models are compared in terms of their accuracies to simulate the response and their applicability to studying winding deformation. The comparison shows that the multi-conductor transmission line model is the best approach due to its ability to model each turn of a winding.With the developed model, the sensitivity of the winding response is investigated. This study shows that a minor change to the winding geometrical parameters could cause a considerable change on the response. On a different issue, it is found that a similar winding failure mode may cause a different response variation depending on the winding type. A study based on measurement is also conducted to investigate the influence of windings from other phases to the tested winding. It reveals that the end to end open circuit response is susceptible to the condition of an adjacent winding. Additionally, investigation on the winding response sensitivity due to the tap changer setting is also carried out.This thesis studies several winding deformations, which includes tilting and bending of conductors and inter-disc fault. These three faults are examined in terms of their severity of damage and location of the fault. Statistical analysis is applied to determine the overall condition of the winding. On the other hand, transfer function based analysis is proposed to extract further iii information if the winding is found to be faulty. This includes using the pole plot and Nyquist plot, in which the latter proved to be useful for all winding failure modes. The transfer function is achieved by applying vec...

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Simulation of a transformer winding for partial discharge propagation studies

Cited by 48 publications

References 3 publications

Transformer Winding Modeling based on Multi-Conductor Transmission Line Model for Partial Discharge Study

Transformer Winding Modeling based on Multi-Conductor Transmission Line Model for Partial Discharge Study

Analysis of Acoustic Wave Propagation in a Power Transformer Model

Frequency response analysis for transformer winding condition monitoring

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