On the Choice Between Transmission Line Equations and Full-Wave Maxwell's Equations for Transient Analysis of Buried Wires

Theethayi, Nelson; Baba, Yoshihiro; Rachidi, Farhad; Thottappillil, Rajeev

doi:10.1109/temc.2008.919040

Cited by 68 publications

(28 citation statements)

References 29 publications

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“…Equation (8) has been analyzed in [19,38,39,44,45,55,56,59,77]. Z inn is the N ×N per-unitlength impedance matrix of the N + 1-conductor TL [22,24,27,40]; Z S−M is the N × 1 per-unit-length shield-mutual matrix impedance; Z (N +1)(N +1) is the sum of: the per-unit-length shield-out impedance, the insulation between per-unit-length shield-armor impedance, and the per-unit-length armor-in impedance; Z A−M is the per-unit-length armor-mutual impedance; and Z (N +2)(N +2) is the sum of: the per-unit-length armor-out impedance, the insulation between perunit-length armor-earth impedance, and the per-unit-length ground impedance [38,39,47,[78][79][80].…”

Section: The Physical Bpl Layermentioning

confidence: 99%

Towards Broadband Over Power Lines Systems Integration: Transmission Characteristics of Underground Low-Voltage Distribution Power Lines

Lazaropoulos¹

2012

PIER B

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Abstract-A complete methodology is employed to determine the transmission characteristics of low-voltage/broadband over power lines (LV/BPL) channels associated with underground power distribution networks, in the light of the multiconductor transmission line (MTL) theory. The established bottom-up approach, already used to treat overhead and underground MV/BPL transmission, is extended to analyze BPL transmission in three-phase N -conductor underground lines with common shield and armor. This analysis shows that these cables may support N + 2 modes, giving rise to N + 2 separate transmission channels which reduce to N +1 if the armor either does not exist or is grounded and to N if the shield is also grounded. In addition to the generalized analysis, a simplified approximation concerning three-phase N -conductor underground cables is also presented. Taking the generalized analysis and the simplified approximation into account, their numerical results concerning attenuation in various underground LV/BPL channels in the frequency range 1-100 MHz are validated against relevant sets of simulations and measurements with satisfactory accuracy and compared to corresponding results of overhead and underground MV/BPL channels. It has been verified that the attenuation in overhead and underground BPL channels depends drastically on power distribution grid type, MTL configuration, and cables used. Moreover, the attenuation in underground LV/BPL channels exhibits a lowpass behavior, is significantly higher than that of overhead MV/BPL ones, and is comparable to that of underground MV/BPL ones. A consequence of the proposed methodology is that it

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Section: The Physical Bpl Layermentioning

confidence: 99%

Towards Broadband Over Power Lines Systems Integration: Transmission Characteristics of Underground Low-Voltage Distribution Power Lines

Lazaropoulos¹

2012

PIER B

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“…The proposed model is based on the TL approximation, thus it can be used for signal transmission calculations up to a specific frequency limit, which depends on the configuration geometry and earth properties. The TL limit is almost 3 MHz for typical overhead configurations [15], while for cable arrangements ranges from 4 MHz to some tens of megahertz [16]. Therefore, in any case the TL frequency range covers the necessary spectrum required for NB PLC applications.…”

Section: Stepmentioning

confidence: 99%

Narrowband power line communication: Medium voltage cable modeling and laboratory experimental results

Papadopoulos

Chrysochos

Papagiannis

2013

Electric Power Systems Research

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“…Details on forming these impedance matrixes are not presented here; instead, related textbooks are referenced [4,5]. For high frequencies, elements of the external impedance matrix become dominant and internal impedance elements become negligible [6,7]. Therefore, only the external impedance matrix will be analyzed in this study.…”

Section: Cable Modeling: Basic Theorymentioning

confidence: 99%

Analysis of ground return impedance calculation methods for modeling of underground cables for lightning studies

Guneri¹,

Alboyacı²

2018

Turk J Elec Eng & Comp Sci

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Analysis of lightning transients in cable systems necessitates accurate calculation of ground return impedances (GRIs) in high-frequency regions. EMT-type programs used for transient analyses incorporate various methods for calculation of GRI. Most of these methods include assumptions and approximations, the validity of which needs to be questioned at high frequencies. In particular, the common approximation of the neglecting effect of displacement currents should be reviewed. The purpose of this paper is to evaluate commonly used GRI calculation methods in terms of their accuracy and validity in high-frequency regions. In this study, GRI calculation methods are analyzed and compared, the effect of displacement currents is evaluated, and validity ranges of the basic calculation formula (Pollaczek formula) are discussed. It is shown that for high-resistivity and high-permittivity soil cases, the effect of displacement currents must be taken into account in high-frequency regions. Most default calculation routines in EMT-type programs neglect this effect. Therefore, it is very important to review and understand the calculation methods used in EMT-type programs before employing them in high-frequency transient analyses. Moreover, it is shown that in most of the practical cases the basic calculation formula (Pollaczek formula) is valid for the frequency range of interest for lightning studies.

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On the Choice Between Transmission Line Equations and Full-Wave Maxwell's Equations for Transient Analysis of Buried Wires

Cited by 68 publications

References 29 publications

Towards Broadband Over Power Lines Systems Integration: Transmission Characteristics of Underground Low-Voltage Distribution Power Lines

Towards Broadband Over Power Lines Systems Integration: Transmission Characteristics of Underground Low-Voltage Distribution Power Lines

Narrowband power line communication: Medium voltage cable modeling and laboratory experimental results

Analysis of ground return impedance calculation methods for modeling of underground cables for lightning studies

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