Magnetic field of parallel and twisted wire pairs

Baltag, Octavian; Rosu, Georgiana; Rau, Miuta Carmina

doi:10.1109/atee.2017.7905020

Cited by 3 publications

(6 citation statements)

References 11 publications

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“…On the basis of (1) to ( 8) and taking into account ( 9) and ( 10) to (13), numerical modeling of the electric field was carried out and values of the working capacitance of the twisted pair were determined, taking into account the presence of ellipticity of structural elements.…”

Section: Methods For Determining the Working Capacitance Of Twisted Pairmentioning

confidence: 99%

“…It was experimentally proven in [11] that in the frequency range where the screen thickness is less than the depth of the skin layer, the inductance of the twisted shielded pair [12] increases. This leads to a decrease in the loss of electromagnetic energy in conductors [13,14] and, in general, in a twisted pair, provided the thickness of the electrical insulation is increased [10]. These works do not take into account the stochastic nature of the twisting step and its effect on the electric capacitance of the cable.…”

Section: Literature Review and Problem Statementmentioning

confidence: 99%

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Constructing a model of the influence of structural and technological inhomogeneities on electromagnetic energy losses in cables based on a twisted pair

Bezprozvannych

Pushkar

2023

EEJET

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The objects of research reported here were cables based on twisted pairs of various designs. The issue of the emergence of additional losses of electromagnetic energy is related to structural and technological inhomogeneities at the technological stage of cable production. The influence of the working capacitance of the twisted pair on the energy losses in the cables has been substantiated. A methodology was proposed for the numerical calculation of the electric field under the condition of ellipticity of the structural elements of the twisted pair. That has made it possible to determine the distortion of the electric field and the effect of inhomogeneities on the working capacitance of a twisted pair of different designs. Specifically, it was shown that for shielded structures with continuous polymer insulation, the distortion of the electric field and the growth of the working capacitance are observed to a greater extent. The need to find technological solutions to reduce the effect of screen ellipticity on cable capacitance has been emphasized. The effectiveness of capacitance regulation in the presence of inhomogeneities has been confirmed, by using foamed insulation to reduce the loss of electromagnetic energy in the cable. The effect of reducing the working capacitance and increasing additional losses under the simultaneous influence of the ellipticity of the electrical insulation and the protective polymer shell has been established, which necessitates the technological process adjustment in the manufacture of twisted pair. An applied aspect of using the results is the possibility of improving the typical technological process of manufacturing twisted pairs to reduce additional losses of electromagnetic energy at the final technological stage of cable production. The adequacy of the numerical studies was confirmed by experimental dependences of the attenuation coefficient and additional energy losses of the unshielded cable in the frequency range up to 100 MHz

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Section: Methods For Determining the Working Capacitance Of Twisted Pairmentioning

confidence: 99%

Section: Literature Review and Problem Statementmentioning

confidence: 99%

Constructing a model of the influence of structural and technological inhomogeneities on electromagnetic energy losses in cables based on a twisted pair

Bezprozvannych

Pushkar

2023

EEJET

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“…With Equations (10) and (11), the definite integrals in Equations (8) and (9) can be performed as follows [21,22]:…”

Section: Establishment Of a Mathematical Model And The Magnetic Vectomentioning

confidence: 99%

“…dv(r ≥ a). (13) Note that, when z' is integrated in Equations (8) and (9), ϕ' also participates in the integral as a function of z'. Equations (12) and (13) are the magnetic vector potential expressions of an arbitrary point (r, ϕ, z) in space, generated by I 1 of coil-1.…”

Section: Establishment Of a Mathematical Model And The Magnetic Vectomentioning

confidence: 99%

“…Helical coils are common wire structures, which are extensively used in a variety of electrical devices [1]. They include, for example, superconducting power transmission cables [2][3][4][5], twisted power cables [6][7][8], wireless power transmission coils [9,10], and the low-voltage windings of high-power transformers [11,12]. Among them, the low-voltage winding of a high-power transformer uses wide tape conductor to carry large currents; simultaneously, to facilitate heat dissipation, the conductor is wound into coaxial helical tape solenoids.…”

Section: Introductionmentioning

confidence: 99%

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Analytical Calculation of Mutual Inductance of Finite-Length Coaxial Helical Filaments and Tape Coils

et al. 2019

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Mutual inductance between finite-length coaxial helical filaments and tape coils are presented analytically. In this paper, a mathematical model for finite-length coaxial helical filaments is established, and subsequently, the mutual inductance of the filaments is derived in a series form, containing a one-dimensional integral. The mutual inductance expression of the filaments is then generalized for a tape conductor. When the tape conductor of each coil is closely wound, then the inverse Mellin transform is further utilized for transforming the generalized integral in the mutual inductance expression into a series involving hypergeometric functions, for increasing the calculation speed. Finally, the obtained expressions are compared numerically with the existing analytical solutions and finite-element simulation in order to verify the correctness and general applicability of the results. In this paper, as all the mutual-inductance analytical expressions are concise with fast convergence, it is easy to obtain the numerical results in software, such as Mathematica. The expressions presented in this paper are applicable to any corresponding geometric parameter, and are thereby more advantageous compared to the existing analytical methods. In addition, evaluation by these expressions is considerably more efficient, as compared to finite element simulation.

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Increasing Noise Immunity of Cables for Fire Protection Systems

Bezprozvannych¹,

Pushkar²

2020

Electrical Engineering &Amp; Electromechanics

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Introduction. Technical means of fire protection systems are capable of operating at data rates from tens to hundreds of Kbit/s with components of a digital signal in the frequency spectrum up to several tens of MHz. Appropriate cable infrastructure with a high level of noise immunity is required to transmit broadband digital signals. Purpose. Substantiation of ways to increase noise immunity of cables based on twisted pairs for modern fire protection systems with the ability to transmit digital signals in the frequency spectrum up to 100 MHz. Methodology. A comparison is made of the influence of the twisting step of pairs in unshielded 4-pair and multi-pair shielded balanced cables on the parameters of electromagnetic effects. It has been experimentally shown that twisting each pair with different steps provides a higher level of noise immunity of cables based on twisted pairs. Practical value. The frequency dependencies of the near end crosstalk in 10-, 30-and 4-pair balanced cables are shown. The influence of the common shield on the attenuation coefficient of the shielded 4-pair cable is established. References 12, figures 8.

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Magnetic field of parallel and twisted wire pairs

Cited by 3 publications

References 11 publications

Constructing a model of the influence of structural and technological inhomogeneities on electromagnetic energy losses in cables based on a twisted pair

Constructing a model of the influence of structural and technological inhomogeneities on electromagnetic energy losses in cables based on a twisted pair

Analytical Calculation of Mutual Inductance of Finite-Length Coaxial Helical Filaments and Tape Coils

Increasing Noise Immunity of Cables for Fire Protection Systems

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