New Methods for Computation of the Inductance Matrix of Transformer Windings for Very Fast Transients Studies

Eslamian, Morteza; Vahidi, B.

doi:10.1109/tpwrd.2012.2204905

Cited by 19 publications

(14 citation statements)

References 21 publications

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“…The challenge here is that at high frequencies (MHz), the slot walls behave like a magnetic insulating wall due to eddy currents. Methods such as a multilayer method of images [89,90] or analytical solutions [91,92] are needed to calculate the inductance matrix. However, all these models are for up to a few MHz and, to the best of our knowledge, no study has been conducted for very high frequencies in the few hundred MHz or GHz ranges.…”

Section: High-frequency Emt Models For Machine Stator Windingmentioning

confidence: 99%

Accelerated insulation aging due to fast, repetitive voltages: A review identifying challenges and future research needs

Ghassemi

2019

IEEE Trans. Dielect. Electr. Insul.

101

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Although the adverse effects of using power electronic conversion on the insulation systems used in different apparatuses have been investigated, they are limited to low slew rates and repetitions. These results cannot be used for next-generation wide bandgap (WBG)-based conversion systems targeted to be fast (with a ⁄ up to 100 kV/μs) and operate at a high switching frequency up to 500 kHz. Frequency and slew rate are two of the most important factors of a voltage pulse, influencing the level of degradation of the insulation systems that are exposed to such voltage pulses. The paper reviews challenges concerning insulation degradation when benefitting from WBG-based conversion systems with the mentioned ⁄ and switching frequency values and identifies technical gaps and future research needs. The paper provides a framework for future research in dielectrics and electrical insulation design for systems under fast, repetitive voltage pluses originated by WBG-based conversion systems.

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Section: High-frequency Emt Models For Machine Stator Windingmentioning

confidence: 99%

Accelerated insulation aging due to fast, repetitive voltages: A review identifying challenges and future research needs

Ghassemi

2019

IEEE Trans. Dielect. Electr. Insul.

101

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“…Such approach allows more detailed calculations of field penetration into conducting wires by high frequency, than 3D modeling, because the number of finite elements may be much higher. Application of finite element method for the computation of lumped parameters seems still to be competitive versus analytical methods proposed in [6], which do not consider skin effect and proximity effect in the wires.…”

Section: Rlc Modelmentioning

confidence: 99%

Modeling of frequency response of transformer winding with axial deformations

Gawrylczyk¹,

Banaszak²

2014

Archives of Electrical Engineering

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One of important methods used for diagnostics of a transformer's active part is Frequency Response Analysis (FRA). It allows to determine the mechanical condition of windings, their displacements, deformations and electric faults, as well as some problems with internal leads and connections, core and bushings. Still pending problem is interpretation of measurements results. One of approaches is application of computer modeling to simulate various failure modes and connected with them changes in FRA response. The paper presents two types of models, one based on lumped parameters with RLC elements, and one based on distributed parameters with TLM method. Both methods give similar results, comparable to real measurements of simulated coil.

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“…The lumped parameters may be calculated on the base of analytic formulae, as in [3], which still do not include skin eect and proximity eect. Another problem is reference to environment.…”

Section: Model Construction and Computation Of Lumped Parametersmentioning

confidence: 99%

Wave Phenomena in High-Voltage Windings of Transformers

Banaszak

2014

Acta Phys. Pol. A

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Determination of mechanical condition of transformer active part can be performed utilizing frequency response of the windings. Many computing models were developed to evaluate behavior of the winding in wide frequency range using dierent numerical methods. Most of them utilizes nite elements, assuming axial symmetry, if possible.In other cases we need to use a three-dimensional model, which results in a signicant reduction in the accuracy of modeling the geometry of the system, as well as the penetration of electromagnetic eld into conductors. From a practical point of view, using computer of average performance, the windings can be modeled with at most 10 turns.From this reason mixed models are proposed, where the electric parameters of the winding are concentrated in the substitute RLC elements. Such models are known as lumped parameter models. Since the parameters of real winding are distributed, the question arises concerning the necessity of taking into account wave phenomena in them. The method allowing this is known as transmission line method. Measurements of frequency response are used in industry. There are still many problems with interpretation of test results. Computer modeling may be a helpful tool allowing to understand relation between the geometry of a winding and its frequency response. To fulll this, models should give similar response as a real measurement. The paper describes a modied transmission line method used for modeling of a transformer winding's frequency response. There is described the model, its parameters, and exemplary solution compared to test data.

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New Methods for Computation of the Inductance Matrix of Transformer Windings for Very Fast Transients Studies

Cited by 19 publications

References 21 publications

Accelerated insulation aging due to fast, repetitive voltages: A review identifying challenges and future research needs

Accelerated insulation aging due to fast, repetitive voltages: A review identifying challenges and future research needs

Modeling of frequency response of transformer winding with axial deformations

Wave Phenomena in High-Voltage Windings of Transformers

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