Transformer Windings’ Parameters Calculation and Lightning Impulse Voltage Distribution Simulation

Župan, Tomislav; Trkulja, Bojan; Obrist, Roman; Franz, Thomas; Cranganu-Cretu, B.; Smajić, Jasmin

doi:10.1109/tmag.2015.2481004

Cited by 46 publications

(21 citation statements)

References 5 publications

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“…12a, or very fast switching of the new generation SiC semiconductors, parasitic capacitances of the transformer windings will affect the voltage and electric (E)-field distribution over the winding turns during these fast transients, as displayed in Figs. 12b and 13, and therefore cannot be neglected [15], [16].…”

Section: Modeling Of the Local Electric Field Withinmentioning

confidence: 99%

FEM-Based Statistical Data-Driven Modeling Approach for MFT Design Optimization

Mogorovic

Dujić

2020

IEEE Trans. Power Electron.

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Section: Modeling Of the Local Electric Field Withinmentioning

confidence: 99%

FEM-Based Statistical Data-Driven Modeling Approach for MFT Design Optimization

Mogorovic

Dujić

2020

IEEE Trans. Power Electron.

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“…where w is the width of the layer, d is the distance between two layers (length of the average electric flux line between two conductors), and r is the curvature radius of the winding. The C ll from layer 1 to layer 12 of the HV winding were determined based on Equation (13). The capacitance between end phase of the winding and the transformer tank, C gt was obtained based on Equation 14[34]:…”

Section: Calculation Of Capacitancementioning

confidence: 99%

“…where N L,i is the number of turns in the i-th layer of the winding and N L,i+1 is the number of turns in the (i+1)-th layer of the winding. The C ll , between outermost two layers of the HV winding was determined based on Equation (13). The equivalent layer-to-layer capacitance for the layers wound in opposite direction is 1/3rd of the static capacitance between two layers and was determined based on Equation 21:…”

Section: Calculation Of Capacitancementioning

confidence: 99%

“…Generally, a transformer's winding responses under impulses are mainly dependent on the design and system configuration. A number of studies have been carried out to examine the transient overvoltage surge propagations through simulations and experimental setups [8][9][10][11][12][13]. Under impulses, resonances in transformers could be initiated due to a frequency of the oscillating components that is similar to its frequency responses [14,15].…”

Section: Introductionmentioning

confidence: 99%

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Investigation on the Resonant Oscillations in an 11 kV Distribution Transformer under Standard and Chopped Lightning Impulse Overvoltages with Different Shield Placement Configurations

et al. 2019

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This paper presents an investigation on the resonant oscillations of an 11 kV layer-type winding transformer under standard and chopped lightning impulse overvoltage conditions based on calculated parameters. The resistances, inductances and capacitances were calculated in order to develop the transformer winding equivalent circuit. The impulse overvoltages were applied to the high voltage (HV) winding and the resonant oscillations were simulated for each of the layers based on different electrostatic shield placement configurations. It is found that the placement of grounded shields between layer 13 and layer 14 results in the highest resonant oscillation and non-linear initial voltage distribution. The oscillation and linear stress distributions are at the lowest for shield placement between the HV and low voltage (LV) windings.

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“…Transformer winding equivalent circuits are traditionally used to examine the voltage surge distribution in the transformer windings [7][8][9]. 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].…”

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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Transformer Windings’ Parameters Calculation and Lightning Impulse Voltage Distribution Simulation

Cited by 46 publications

References 5 publications

FEM-Based Statistical Data-Driven Modeling Approach for MFT Design Optimization

FEM-Based Statistical Data-Driven Modeling Approach for MFT Design Optimization

Investigation on the Resonant Oscillations in an 11 kV Distribution Transformer under Standard and Chopped Lightning Impulse Overvoltages with Different Shield Placement Configurations

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

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