Using the finite element method to calculate parameters for a detailed model of transformer winding for partial discharge research

Hosseini, Seyed Mohammad Hassan; Madar, Seyed Mohsen Enjavi; Vakilian, Mehdi

doi:10.3906/elk-1209-132

Cited by 15 publications

(10 citation statements)

References 12 publications

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“…Due to small core magnetic effect for frequency above 10 MHz, the losses due to the core were not considered in the current calculation [25]. The skin and proximity effects of the conductor were considered during the calculation of series resistance of the HV winding based on equations in [21,22,26]. The conductance, G was calculated based on equations in [21,24].…”

Section: Plos Onementioning

confidence: 99%

Extraction of winding parameters for 33/11 kV, 30 MVA transformer based on finite element method for frequency response modelling

et al. 2020

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This paper proposes an alternative approach to extract transformer's winding parameters of resistance (R), inductance (L), capacitance (C) and conductance (G) based on Finite Element Method (FEM). The capacitance and conductance were computed based on Fast Multiple Method (FMM) and Method of Moment (MoM) through quasi-electrostatics approach. The AC resistances and inductances were computed based on MoM through quasi-magnetostatics approach. Maxwell's equations were used to compute the DC resistances and inductances. Based on the FEM computed parameters, the frequency response of the winding was obtained through the Bode plot function. The simulated frequency response by FEM model was compared with the simulated frequency response based on the Multi-conductor Transmission Line (MTL) model and the measured frequency response of a 33/11 kV, 30 MVA transformer. The statistical indices such as Root Mean Square Error (RMSE) and Absolute Sum of Logarithmic Error (ASLE) were used to analyze the performance of the proposed FEM model. It is found that the simulated frequency response by FEM model is quite close to measured frequency response at low and mid frequency regions as compared to simulated frequency response by MTL model based on RMSE and ASLE analysis.

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Section: Plos Onementioning

confidence: 99%

Extraction of winding parameters for 33/11 kV, 30 MVA transformer based on finite element method for frequency response modelling

et al. 2020

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“…Figure represents a winding unit along and its equivalent circuit. In this figure, L i is equivalent inductance of the i th unit that represents leakage flux of turns of the i th unit, L i,j is the mutual inductance between i th and j th units, C i is length capacitance of the i th unit that represents capacitances between turns of the i th unit, C e represents the capacitance between the i th unit and ground potential, and R i is the dielectric losses in insulation of the i th unit . This equivalent circuit is considered as the interface between voltage source and finite element region for each coil turn in Figure .…”

Section: Developed Model For Transient Studiesmentioning

confidence: 99%

An improved model of cage induction machines for fast transients studies

Hosseinibafqi

Akbari

Saied

2019

Int Trans Electr Energ Syst

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Summary This paper investigates modeling improvement of cage induction machines (CIMs) in fast transients. In this method, RLC ladder network model associated with each turn of the coil is employed as the interface between voltage sources and finite element region. All circuit and field equations are rewritten to obtain final matrix of the system. The developed model opens a way to improve electrical machine simulators, on the basis of finite element method (FEM), to obtain a more accurate voltage distribution waveform at each turn of the coil in fast transients and to increase frequency validity of the modeled machine by RLC method using the FEM.

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“…There is a complicated relationship between the ohmic resistance of transformer winding and frequency [19]; embarking on it makes the model calculation unnecessarily complex [7,19]. To calculate the series resistance per unit length, it is wise to use the following equation, which is simpler [20]…”

Section: Insulation and Ohmic Resistancesmentioning

confidence: 99%

Modified transformer winding ladder network model to assess non‐dominant frequencies

Ahour¹,

Seyedtabaie²,

Gharehpetian

2017

IET Electric Power Applications

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In this study, the challenging problem of computing the frequency-dependent lumped parameter ladder network model for transformer winding based on impedance frequency response is investigated. It is shown that the existing conventional model is not capable of simulating the non-dominant resonances; rather, this phenomenon can be adequately modelled using extra intersection capacitors. As usual, this large-scale non-linear optimisation problem is addressed using properly lined-up genetic algorithm. To accelerate the success of the estimation, the dimension of the problem and the search space is reduced by using logical and real constraints and equations derived from the transformer geometry and its electromagnetic specifications; if this is not done, the optimisation fails. The test results on a 20/0.4 kV, 1600 kVA transformer indicates that the computed model, which is improved and detailed, is superior to the conventional one in terms of simulating the non-dominant resonances of the transformer winding. Therefore, it is more reliable for the transformer transient behaviour analysis.

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Using the finite element method to calculate parameters for a detailed model of transformer winding for partial discharge research

Cited by 15 publications

References 12 publications

Extraction of winding parameters for 33/11 kV, 30 MVA transformer based on finite element method for frequency response modelling

Extraction of winding parameters for 33/11 kV, 30 MVA transformer based on finite element method for frequency response modelling

An improved model of cage induction machines for fast transients studies

Modified transformer winding ladder network model to assess non‐dominant frequencies

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