Calculation of frequency-dependent parameters of power cables: matrix partitioning techniques

Rivas, Richard A.; Martí, José

doi:10.1109/tpwrd.2002.803827

Cited by 26 publications

(7 citation statements)

References 12 publications

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“…But when the semiconducting screen is attached with both core and sheath conductor, it constitutes cable with multiple semiconductors as shown in Fig. 1 whose loop impedances can be obtained by replacing surface and mutual impedance of core and sheath each in (4.a) to (4.c) with that of the core and sheath semiconductor assembly given by (19) to (21). So the loop impedances of cable with multiple semiconducting screens are given as,…”

Section: A: Effective Outer Surface Impedance (Z 22 )mentioning

confidence: 99%

Effects of Multiple Semiconducting Screens on Line Parameters and Wave Properties of Underground Cable

Ghosh

Ghosh²,

Das

2019

IEEE Access

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Along with the geometric and electromagnetic properties, incorporation of multiple semiconducting screens in an underground (UG) power cable influences the primary line parameters as well as wave properties of the cable. The impacts of multiple semiconducting screens in UG cable structure compared to the cable with single and without semiconducting screen have been reported in this paper. The effective impedance of conductor-semiconductor assembly in cable structure is determined based on the electromagnetic theory of tubular conductor. Further, the complete impedance matrix of the UG cable with multiple semiconducting screens is determined in both mesh and phase domain and reported in this paper. The expressions of the impedances of UG cable with multiple semiconducting screens as obtained using the electromagnetic approach also have been reproduced using the conventional loop current method to justify the robustness and accuracy of the adopted approach. Comparative analyses of various line parameters and wave properties between UG cables with multiple, single and without semiconducting screens have been carried out by varying the frequency as well as semiconducting screen properties. Such analyses indicate that the inclusion of multiple semiconducting screens can lead to the improvement in wave properties of UG cable in high frequency zone. INDEX TERMS Attenuation, loop current, phase constant, phase domain, semiconductor, skin depth, double layered conductor.

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Section: A: Effective Outer Surface Impedance (Z 22 )mentioning

confidence: 99%

Effects of Multiple Semiconducting Screens on Line Parameters and Wave Properties of Underground Cable

Ghosh

Ghosh²,

Das

2019

IEEE Access

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“…Analytical formulas exist for a limited set of canonical cross-section geometries [77][78][79][80] or can be used in combination with cable cross-section partitioning for more general crosssection geometries [81,82]. Different numerical electromagnetic methods can also be used to extract the cable p.u.l.…”

Section: Determination Of Frequency-dependent Per Unit Length Parametersmentioning

confidence: 99%

EMC Component Modeling and System-Level Simulations of Power Converters: AC Motor Drives

et al. 2021

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EMC simulations are an indispensable tool to analyze EMC noise propagation in power converters and to assess the best filtering options. In this paper, we first show how to set up EMC simulations of power converters and then we demonstrate their use on the example of an industrial AC motor drive. Broadband models of key power converter components are reviewed and combined into a circuit model of the complete power converter setup enabling detailed EMC analysis. The approach is demonstrated by analyzing the conducted noise emissions of a 75 kW power converter driving a 45 kW motor. Based on the simulations, the critical impedances, the dominant noise propagation, and the most efficient filter component and location within the system are identified. For the analyzed system, maxima of EMC noise are caused by resonances of the long motor cable and can be accurately predicted as functions of type, length, and layout of the motor cable. The common-mode noise at the LISN is shown to have a dominant contribution caused by magnetic coupling between the noisy motor side and the AC input side of the drive. All the predictions are validated by measurements and highlight the benefit of simulation-based EMC analysis and filter design.

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“…Method of moments can be applied to integral equations for the current density, where the cross section is discretized, to improve the convergence, by a non-uniform grid that obeys the skin effect (Matsuki and Matsushima, 2012). Detailed discussion is presented for the current density distribution and its effect on the impedance, especially for a high frequency range (Rivas and Marti, 2002).…”

Section: Introductionmentioning

confidence: 99%

Enhanced method for pulse skin effect calculation of cylindrical conductors

Raicevic

Aleksić

Iatcheva

et al. 2020

COMPEL

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Purpose This paper aims to present a new approach to the numerical solution of skin effect integral equations in cylindrical conductors. An approximate, but very simple and accurate method for calculating the current density distribution, skin-effect resistance and inductance, in pulse regime of cylindrical conductor, having a circular or rectangular cross-section, is considered. The differential evolution method is applied for minimization of error functional. Because of its application in the practice, the lightning impulse is observed. Direct and inverse fast Fourier transform is applied. Design/methodology/approach This method contributes to increasing of correctness and much faster convergence. As the electromagnetic field components depend on the current density derivation, the proposed method gives a very accurate solution not only for current density distribution and resistance but also for field components and for internal inductance coefficients. Distribution of current and electromagnetic field in bus-bars can be successfully determined if the proximity effect is included together with the skin effect in calculations. Findings The study shows the strong influence of direct lightning strikes on the distribution of electrical current in cables used in lightning protection systems. The current impulse causes an increase in the current density at all points of the cross-section of the conductor, and in particular the skin effect on the external periphery. Based on the data calculated by using the proposed method, it is possible to calculate the minimum dimensions of the conductors to prevent system failures. Research limitations/implications There are a number of approximations of lightning strike impulse in the literature. This is a limiting factor that affects the reliability and agreement between measured data with calculated values. Originality/value In contrast with other methods, the current density function is approximated by finite functional series, which automatically satisfy wave equation and existing boundary conditions. It is necessary to minimize the functional. This approach leads to a very accurate solution, even in the case when only two terms in current approximation are adopted.

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Calculation of frequency-dependent parameters of power cables: matrix partitioning techniques

Cited by 26 publications

References 12 publications

Effects of Multiple Semiconducting Screens on Line Parameters and Wave Properties of Underground Cable

Effects of Multiple Semiconducting Screens on Line Parameters and Wave Properties of Underground Cable

EMC Component Modeling and System-Level Simulations of Power Converters: AC Motor Drives

Enhanced method for pulse skin effect calculation of cylindrical conductors

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