Further studies on wave propagation in overhead lines with earth return: impedance of stratified earth

Nakagawa, Masami; Ametani, Akihiro; Iwamoto, K.

doi:10.1049/piee.1973.0312

Cited by 61 publications

(59 citation statements)

References 6 publications

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“…The error is corrected by replacing ε e in (18) by ε 0 (ε r − 1) as in (19). Now, it appears that modified Pollaczek's, Carson's, and Sunde's formulas are identical to each other and are given by (9) and (19). …”

Section: Carson's Pollaczek's and Sunde's Formulasmentioning

confidence: 92%

“…Manuscript In this paper, impedance formulas by Pollaczek and Carson are investigated in comparison with that derived for a stratified earth [9], [10], and a modified Pollaczek's and Carson's formula is described based on the stratified earth-return impedance. By applying the modified impedance formula and Wise's earthreturn admittance [8], the attenuation constant on an overhead conductor is evaluated.…”

mentioning

confidence: 99%

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Wave Propagation on an Overhead Multiconductor in a High-Frequency Region

Ametani

Miyamoto

Baba

et al. 2014

IEEE Trans. Electromagn. Compat.

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Carson's, Pollaczek's, Wise's, and Sunde's earthreturn impedances of an overhead line have been examined, and errors involved in the formulas are explained. Modified Pollaczek's and Carson's/Sunde's formulas are described. Wave propagation characteristics on a multiconductor in a high-frequency region are evaluated by adopting the modified earth-return impedance and Wise's earth-return admittance. Sommerfeld-Goubau propagation in a high-frequency region, which shows transition between transverse electromagnetic and transverse magnetic propagation, has been confirmed in the calculated results which agree with those predicted by Kikuchi for a single conductor. On a multiconductor system, it is found that the aerial mode also shows SommerfeldGoubau propagation when the separation between conductors is large and the earth resistivity is high.

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Section: Carson's Pollaczek's and Sunde's Formulasmentioning

confidence: 92%

mentioning

confidence: 99%

Wave Propagation on an Overhead Multiconductor in a High-Frequency Region

Ametani

Miyamoto

Baba

et al. 2014

IEEE Trans. Electromagn. Compat.

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“…Z and Y are square matrices of the per-unit (pu) length impedance and admittance. The admittance matrix is related to the potential coefficient matrix P [5,7], by the relation:…”

Section: Impedance and Admittance Of Overhead Lines Above A Stratifiementioning

confidence: 99%

“…Later Nakagawa et al [5] have developed an accurate and general solution for the earth-return impedance of an overhead line. They considered the soil consisting of three layers with arbitrary resistivity, permittivity and permeability.…”

Section: Introductionmentioning

confidence: 99%

Equivalent Model From Two Layers Stratified Media to Homogeneous Media for Overhead Lines

Belganche¹,

Maaouni²,

Mzerd³

et al. 2015

PIER M

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Abstract-Overhead power transmission line is influenced by the resistivity of earth return path. The topic is developed in literature by considering a homogeneous and isotropic earth, or verily the soil is more represented by several layers. The scope of this paper is to provide an equivalent homogeneous soil to the two layers stratified soil. The equivalent electromagnetic properties of the soil are calculated using an accurate minimization method. Numerical results presented in this paper, show the efficiency of the proposed model.

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“…Next, the self impedance of each conductor, the inductive and capacitive mutual impedances between every pair of conductors, and the shunt impedance of each conductor to ground are computed. Interested readers may refer to [3,4] for information on line parameter computations. Finally, the circuit model can be analyzed using the double-sided elimination method described in [5] for any network where mutual capacitances between conductors can be neglected.…”

Section: Description Of the Computation Methodsmentioning

confidence: 99%

A study of interference from AC electrified railway systems to nearby earth return circuits

Pleym

Ma²

1999 IEEE International Symposium on Electromagnetic Compatability. Symposium Record (Cat. No.99CH36261)

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Inductive and conductive coupling from a railway system containing booster transformers to a parallel telephone cable is studied. An electromagnetic field approach and a circuit theory approach combined with a grounding analysis have been used for the study. The two methods give results that are in good agreement with each other for currents and potentials in both the disturbing and the disturbed c h i t s

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Further studies on wave propagation in overhead lines with earth return: impedance of stratified earth

Cited by 61 publications

References 6 publications

Wave Propagation on an Overhead Multiconductor in a High-Frequency Region

Wave Propagation on an Overhead Multiconductor in a High-Frequency Region

Equivalent Model From Two Layers Stratified Media to Homogeneous Media for Overhead Lines

A study of interference from AC electrified railway systems to nearby earth return circuits

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