Electrodynamic Forces between Electrical Conductors and Cylindrical Magnetic Shields

Mišić, Milan; Bogićević, Zorica; Bjelić, Slobodan

doi:10.9734/bjast/2015/20541

Cited by 3 publications

(5 citation statements)

References 2 publications

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“…Transformation from equations of finite differences into equations with integraldifferential form is possible [23]. The influence of the ferromagnetic material of the magnetic circuit and the processes in it have not been the subject of attention here.…”

Section: State Of Electric Line Presented By Scheme With Distributed ...mentioning

confidence: 99%

Idling and Short-circuit Analysis of a Three-phase Power Transformer Represented by a Scheme with Distributed Parameters and П line Scheme in the Electrical Network

Marković¹,

Bjelić²,

Marković³

et al. 2023

CJAST

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Aims: The paper presents a simulation of a theoretical model of electromagnetic extreme regimes, idling and short circuit, in a three-phase power transformer. The main goal of this paper is to show in a quality way that the computer simulation of the obtained theoretical model using the software package MATLAB Simulink confirms the possibility of analyzing the extreme modes of transformers. Methodology: To solve the problem of the presence of a transformer as an element of power in the power system, the following are used: Analytical methods in which the transformer is presented as a network element - usually as a quadripole, numerical programming that includes dynamic programming and independent variables, and combined programming with integer values. In the process simulation on elements with given parameters and frequency, a comparison of the substitution schemes used so far in the theory of electric circuits is performed. The accuracy of these theoretical models can be confirmed by voltage and current diagrams in the adapted software package MATLAB Simulink. Conclusion: The presented theoretical model and the applied algorithm in the simulation are universal and can be used for different states in which a three-phase power transformer can be found. Problems that occur in the analysis of transient processes in electrical networks where the element is a transformer can be minimized using simulation methods. Changing any parameter in the electrical circuit requires a new calculation of the condition of the circuit from the very beginning due to the new initial conditions. Analytical methods combined with the simulation method were used in the research of extreme regimes, such as idling and short circuit. The verified simulation method realized using the adapted MATLAB Simulink program had a threefold purpose: to serve the calculation and simulation of quantities that can be obtained by testing or measuring, to establish the original algorithm and to verify the proposed method. Also, this type of simulation can replace the idle and short circuit test.

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Section: State Of Electric Line Presented By Scheme With Distributed ...mentioning

confidence: 99%

Idling and Short-circuit Analysis of a Three-phase Power Transformer Represented by a Scheme with Distributed Parameters and П line Scheme in the Electrical Network

Marković¹,

Bjelić²,

Marković³

et al. 2023

CJAST

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show abstract

“…Although the authors in references [1][2][3][4][5] and [6][7][8] proposed a procedure similar to the method used in this paper, the method has not been referenced and verified in detail. Due to the "small" number of references on this topicand based on insights into the mentioned references and other available literature to date, the authors have not found a suitable and sufficiently accurate, theoretical procedure that would adequately determine the unpredictable distribution and spreading of voltage and current waves.…”

Section: Literature Reviewmentioning

confidence: 99%

“…In transient processes of electric machines [2], in addition to the fundamental harmonics and higher voltage harmonics, there are also:  excessive values of currents and magnetic inertia and saturation of magnetic circuits,  large electrodynamic forces caused by excessive currents and influence of interaction of these currents with the shells and armor of ferromagnetic materials,  creation of conditions for ferroresonance, mechanical vibrations in core sheets [3][4]  accelerated aging of insulation material due to cyclic changes of induction,  increase in losses in copper (due to fundamental and higher harmonics),  increased losses in the core (due to hysteresis and vortical currents).…”

Section: Introductionmentioning

confidence: 99%

The Influence of Magnetic Hysteresis in Magnetic Circuit Sheets on Transient Processes in Electrical Machines

Marković¹,

Kosovo²,

Bjelić³

et al. 2021

IJIGSP

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The character of transient processes in electrical machines and transformers defines the shape of magnetization curve of the magnetic circuit, i.e. of its sheets. Approximate analytical or numerical methods are used to determine the influence of saturation and hysteresis on transient processes. This paper presents an analytical method for the calculation of transient process in a magnetic circuit with assumed magnetization characteristic, one part of which contains saturation. An operator calculus was used to solve Maxwell's equations that characterize the transient process.The applied method has been verified by the simulation results using the adapted part of psbxfosaturable.mdl of the MATLAB Simulink software package. It is also shown that due to saturation and influence of hysteresis, additional free components appear in the sheets of the magnetic circuit (recognized in obtained values of current, induction and flux). Analysis of the shape of time diagrams of quantities also shows that the time constants of these quantities increase. In the linear part of the magnetization curve, solutions with higher accuracy are obtained, and in the part of saturation in which the accuracy of the method was not in foreground, only a qualitative analysis of the transient process has been achieved. In comparison with other methods, two regimes of transient processes when given are analyzed: magnetic excitation forces and field strengths, and magnetic fluxes and inductions.

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“…The standards that must be followed and which are related to electrical installation are IEC IEC 60364- (4,5,6,7) and IEC 60529, IEC 61032 [3].…”

Section: Introductionmentioning

confidence: 99%

“…When selecting the material, apart from electromagnetic impact, it is necessary to take into account the chemical impact, primarily of corrosion. Technical, economic and environmental criteria require that in the design and selection of geometric dimensions of the grounding elements computers and special software are to be used [4,5].…”

Section: Introductionmentioning

confidence: 99%

Transient Processes on the Elements of Underground Installations

Jovanovic¹,

Bjelić²,

Marković³

2017

IJITCS

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Abstract-Transient processes on the elements of installation with electric conductive material may endanger the environment in urban areas and therefore action must be taken to mitigate possible consequences and protect the environment. Installation layers of lines of underground installation (electrical, gas, water…) that are used for the flow of energy/fluids do not provide a full protection and currents of static discharge discharged into the soil are particularly dangerous. At static discharges conductors receive high potentials and a strong electric field is created around them, which will be greater as the conductivity of the soil is weaker.If the value of the field is greater than the disruptive voltage of the soil around earth wire (probe) the breakthrough occurs and the majority of soil becomes conductive. Particular problem are components of high frequency currents or voltages. Disorders of frequency in the range of 50 Hz to 5 kHz that can affect the selection of installation parameters, in compliance with all environmental criteria, are simulated by adapted subprogram in the part of the package Sym Power MATLAB.

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Electrodynamic Forces between Electrical Conductors and Cylindrical Magnetic Shields

Cited by 3 publications

References 2 publications

Idling and Short-circuit Analysis of a Three-phase Power Transformer Represented by a Scheme with Distributed Parameters and П line Scheme in the Electrical Network

Idling and Short-circuit Analysis of a Three-phase Power Transformer Represented by a Scheme with Distributed Parameters and П line Scheme in the Electrical Network

The Influence of Magnetic Hysteresis in Magnetic Circuit Sheets on Transient Processes in Electrical Machines

Transient Processes on the Elements of Underground Installations

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