Automatic J–A Model Parameter Tuning Algorithm for High Accuracy Inrush Current Simulation

Wen, Xiaoru; Jing-zhuo, Zhang; Lu, Hailiang

doi:10.3390/en10040480

Cited by 6 publications

(5 citation statements)

References 25 publications

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“…The structural parameters and physical properties of each part of the CT are shown in Tables 1 and 2, Figure 1 representing the transformer elements. Before conducting the electro-thermal coupling simulation, in order to simplify the calculation, the following assumptions were made for the new current transformer electro-thermal coupling model [19,20].…”

Section: Electro-thermal Coupling Model Of New Current Transformermentioning

confidence: 99%

“…Firstly, the 3D geometry model of the new current transformer is established in the calculation environment, and the physical parameters of the electro-thermal coupling are determined according to the materials of each part of the transformer. The unit volume loss Before conducting the electro-thermal coupling simulation, in order to simplify the calculation, the following assumptions were made for the new current transformer electrothermal coupling model [19,20].…”

Section: The Coupling Calculation Flow Of the Electro-thermal Couplin...mentioning

confidence: 99%

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Three-Dimensional Electro-Thermal Analysis of a New Type Current Transformer Design for Power Distribution Networks

Dong

Gao

et al. 2021

Energies

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In recent years, the new type design of current transformer with bushing structure has been widely used in the distribution network system due to its advantages of miniaturization, high mechanical strength, maintenance-free, safety and environmental protection. The internal temperature field distribution is an important characteristic parameter to characterize the thermal insulation and aging performance of the transformer, and the internal temperature field distribution is mainly derived from the joule heat generated by the primary side guide rod after flowing through the current. Since the electric environment is a transient field and the thermal environment changes slowly with time as a steady field under the actual conditions, it is more complex and necessary to study the electrothermal coupling field of current transformer (CT). In this paper, a 3D simulation model of a new type design of current transformer for distribution network based on electric-thermal coupling is established by using finite element method (FEM) software. Considering that the actual thermal conduction process of CT is mainly by conduction, convection and radiation, three different kinds of boundary conditions such as solid heat transfer boundary condition, heat convection boundary condition and surface radiation boundary condition are applied to the CT. Through the model created above, the temperature rise process and the distribution characteristics of temperature gradient of the inner conductor under different current, different ambient temperatures and different core diameters conditions are studied. Meanwhile, the hottest temperature and the maximum temperature gradient difference are calculated. According to this, the position of weak insulation of the transformer is determined. The research results can provide a reference for the factory production of new type design of current transformer.

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Section: Electro-thermal Coupling Model Of New Current Transformermentioning

confidence: 99%

Section: The Coupling Calculation Flow Of the Electro-thermal Couplin...mentioning

confidence: 99%

Three-Dimensional Electro-Thermal Analysis of a New Type Current Transformer Design for Power Distribution Networks

Dong

Gao

et al. 2021

Energies

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“…This approach leads to the model of an anhysteretic magnetization curve expressed with the hyperbolic tangent function A convenient model of hysteresis should be simple to use in calculations, described with a small set of parameters, and provide a good fit to the experimental data. Various mathematical models have been developed to describe hysteresis loops, such as the wide-spread Jiles-Atherton (JA) [2][3][4] and Preisach formalisms [5][6][7][8]. However, parameter determination for the JA model can be complicated, whereas the Preisach model can be computationally demanding.…”

Section: Model Descriptionmentioning

confidence: 99%

The Use of Hypergeometric Functions in Hysteresis Modeling

Chwastek

Herceg

2020

Energies

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Accurate hysteresis models are necessary for modeling of magnetic components of devices such as transformers and motors. This study presents a hysteresis model with a convenient analytical form, based on hypergeometric functions with one free parameter, built upon a class of parameterized curves. The aim of this work is to explore suitability of the presented model for describing major and minor loops, as well as to demonstrate improved agreement between experimental and modeled hysteresis loops. The procedure for generating first order reversal curves is also discussed. The added parameter, introduced into the model, controls the shape of the model curve, especially near saturation. It can be adjusted to provide better agreement between measured and model curves. The model parameters are nonlinearly dependent; therefore, they are determined in a nonlinear curve fitting procedure. The choice of the initial approximation and a suitable set of constraints for the optimization procedure are discussed. The inverse of the model function, required to generate first order reversal curves, cannot be obtained in analytical form. The procedure to calculate the inverse numerically is presented. Performance of the model is demonstrated and verified on experimental data obtained from measurements on construction steel sheets and grain-oriented electrical steel samples.

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“…Description of magnetomechanical effect still remains its most important application target [14], yet it should be stated that the JA model is quite versatile. Some of the less common applications include modeling of transient states in electrical grids related to inrush phenomena [15] or calculations of shielding factors [16]. The Jiles-Atherton model including the magnetoelastic term is usually applied for the description of magnetization processes in steels [6][7][8][17][18][19][20][21][22][23].…”

Section: Ofmentioning

confidence: 99%

Modeling Hysteresis Loops of Self-Developed Soft Magnetic Composite Cores Using the Jiles-Atherton-Sablik Theory

Jakubas¹,

Chwastek²

2019

Preprint

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Magnetic properties of soft magnetic composites are highly sensitive to the processing conditions. In this paper we focus on the possibility to model this effect using the Jiles-Atherton-Sablik theory. It is assumed that the effect of varying compaction pressure may be described by direct introduction of stress-dependent term in the model equations. The values of model parameters are kept constant. Verification of the proposed approach is carried out using measurement data from self-developed iron-based composite cores.

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Automatic J–A Model Parameter Tuning Algorithm for High Accuracy Inrush Current Simulation

Cited by 6 publications

References 25 publications

Three-Dimensional Electro-Thermal Analysis of a New Type Current Transformer Design for Power Distribution Networks

Three-Dimensional Electro-Thermal Analysis of a New Type Current Transformer Design for Power Distribution Networks

The Use of Hypergeometric Functions in Hysteresis Modeling

Modeling Hysteresis Loops of Self-Developed Soft Magnetic Composite Cores Using the Jiles-Atherton-Sablik Theory

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