Modelling of foil‐type transformer windings for computation of terminal impedance and internal voltage propagation

Theocharis, Andreas; Popov, Marjan

doi:10.1049/iet-epa.2014.0135

Cited by 15 publications

(6 citation statements)

References 43 publications

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“…Each block represents a division of the winding that could be one turn or a group of turns of the winding. The values of the lumped parameters of the blocks are computed by suitable methods as those given in [36]. For the equivalent circuit in Fig.…”

Section: A Equivalent Circuit Of the Winding Non-linear Modelmentioning

confidence: 99%

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A Piece-wise Linearized Transformer Winding Model for the Analysis of Internal Voltage Propagation

Theocharis

Popov

2019

2019 IEEE Milan PowerTech

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In this paper, a piece-wise linearized transformer winding model is proposed for transient internal voltage distribution computations. In particular, the model is based on the linearization of the primitive non-linear, frequency dependent and invariant matrix of voltage distribution factors. This primitive matrix is utilized as a pattern from which, for any specific switching event and its frequency spectrum, the piecewise linearized matrix of voltage distribution factors can be computed. In this manner, a unified black-box to lumpedparameters combined transformer model successfully bypasses the need of geometrical data. The computations are also significantly reduced. The model is verified by measurements on a three-phase distribution transformer.

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Section: A Equivalent Circuit Of the Winding Non-linear Modelmentioning

confidence: 99%

“…1. In [36], an extensive investigation about the role of lumped parameters shown in Fig. 1 is presented.…”

Section: Computation Of the Matrix Of Voltage Distribution Factorsmentioning

confidence: 99%

A Piece-wise Linearized Transformer Winding Model for the Analysis of Internal Voltage Propagation

Theocharis

Popov

2019

2019 IEEE Milan PowerTech

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“…Several studies have been carried out to examine the transient voltage surge propagations through simulations and experimental setups [10][11][12][13][14][15][16]. Lumped equivalent circuit model have been widely used to analyze the resonant responses of windings subjected to switching surges [6,[17][18][19][20]. Various methods have been used to examine the transient voltage of transformer windings such as travelling wave theory, winding terminal characteristics and modal analysis [6,21,22].…”

Section: Introductionmentioning

confidence: 99%

Effect of shield placement for transient voltage mitigation due to switching surges in a 33/11 kV transformer windings

et al. 2020

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This study presents an investigation on the effect of shield placement for mitigation of transient voltage in a 33/11 kV, 30 MVA transformer due to Standard Switching Impulse (SSI) and Oscillating Switching Impulse (OSI) surges. Generally, the winding and insulation in transformers could experience severe voltage stress due to the external impulses i.e. switching events. Hence, it is important to examine the voltage stress and identify the mitigation action i.e. shield placements in order to reduce the adverse effect to the transformer windings. First, the resistances, inductances, and capacitances (RLC) were calculated for disc type transformer in order to develop the winding RLC equivalent circuit. The SSI and OSI transient voltage waveforms were applied to the High Voltage (HV) winding whereby the transient voltages were simulated for each disc. The resulting voltage stresses were mitigated through different configurations of electrostatic shield placements. The resonant oscillations generated due to switching surges were analysed through initial voltage distribution. The analyses on the transient voltages of the transformer winding and standard error of the slope (SEb) reveal that the location of shield placement has a significant effect on the resonant switching voltages. The increment of the shield number in the windings does not guarantee optimize mitigation of the resonant switching transient voltages. It is found that the voltage stress along the windings is linear once a floating shield is placed between the HV and Low Voltage (LV) windings of the disc-type transformer under the SSI and OSI waveforms. These findings could assist the manufacturers with appropriate technical basis for mitigation of the transformer winding against the external transient switching overvoltage surges.

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“…The winding frequency response is, therefore, a characteristic of each transformer winding [2]. However, the mechanical structure of windings of electrical machines may be subjected to faults currents which may cause mechanical deformations or defects in their windings [3][4][5][6]. Hence, the parameter calculations of the transformer winding are an important tool to study its frequency behaviour.…”

Section: Introductionmentioning

confidence: 99%

“…For this reason, the transfer function method was used in [5] for the purpose of detecting the winding damages in power transformer. The development of the high-frequency lumped model to a transformer has been also accomplished [6] to support the FRA interpretation. Azizian and Bigdeli of [7] have developed an efficient approach for dynamic thermal modelling of cast resin dry-type transformer and an experimental validation of the model parameters have been performed using particle swarm optimisation (PSO) algorithm.…”

Section: Introductionmentioning

confidence: 99%

BA to construction of equivalent circuit of a transformer winding from frequency response analysis measurement

Chaouche¹,

Houassine²,

Moulahoum³

et al. 2018

IET Electric Power Applications

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The calculation of high-frequency model parameters of a winding is crucial for the integrity assessment of transformer winding damages and its severity. Bat algorithm (BA) is one of the modern and efficient methods used in computational intelligence due to its efficiency to obtain better results for complicated non-linear problems. In this study, an iterative method to ensure the mutually coupled equivalent model synthesis of an actual isolated transformer winding is proposed via bat search algorithm based on frequency response analysis data measurement (resonance frequencies, equivalent inductance and effective capacitance). The equivalent ladder network synthesis of transformer winding using the BA is based on the construction of the search space of the model parameters, thus each model element to be identified must be limited between two bounds (the upper and lower bounds) based on constraints and inequalities defining the model parameters. The effectiveness of the BA was tested by simulation and experimentally on two case studies of two isolated transformer windings with an air core. Furthermore, a comparative study of BA, particle swarm optimisation and the magnitude vector fitting was made in terms of accuracy and convergence speed.

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Modelling of foil‐type transformer windings for computation of terminal impedance and internal voltage propagation

Cited by 15 publications

References 43 publications

A Piece-wise Linearized Transformer Winding Model for the Analysis of Internal Voltage Propagation

A Piece-wise Linearized Transformer Winding Model for the Analysis of Internal Voltage Propagation

Effect of shield placement for transient voltage mitigation due to switching surges in a 33/11 kV transformer windings

BA to construction of equivalent circuit of a transformer winding from frequency response analysis measurement

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