A Technique for Representing Lossy Thin Wires and Coaxial Cables for FDTD-Based Surge Simulations

Tatematsu, Akiyoshi

doi:10.1109/temc.2017.2737002

Cited by 24 publications

(9 citation statements)

References 29 publications

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“…The algorithm may be started by assuming I m,0 = I m,1 = 0 and calculating I m,2 using equation (16). Once I m,2 is obtained, we can proceed to calculate I m, 3 .…”

Section: International Journal Of Antennas and Propagationmentioning

confidence: 99%

“…There are solutions based on approximations such as the reflection-coefficient method [11,12], which is computationally faster, but as it assumes that the waves incident on the ground are plane waves, it presents losses of accuracy when the approximation is not valid [13]. Meanwhile, these problems can be solved by the finite-difference time-domain (FDTD) method [14][15][16], time-domain integral equation (TDIE) method [17][18][19], and discontinuous Galerkin time-domain (DGTD) method [20,21]. Most of these studies are carried out in free space or isotropic half-space because the reflected field of multilayered and even-layered anisotropic half-space is difficult to obtain.…”

Section: Introductionmentioning

confidence: 99%

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A New Method to Calculate Induced Current of Thin Wire over Anisotropic Ground under HPM

Cao

2019

International Journal of Antennas and Propagation

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The time response analysis of wire structures is often carried out in free space or isotropic half-space, but the real ground is usually layered and has anisotropic properties. In this paper, the induced current of a thin wire over layered anisotropic half-space under a high-power microwave (HPM) is calculated by using the time-domain integral equation (TDIE) method. The reflection coefficient of a layered anisotropic medium is obtained by the general transmitting matrix (GTM) method combined with Fourier transform. The variation of the induced current on the thin wire under different incident conditions is analyzed.

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“…The algorithm may be started by assuming I m,0 = I m,1 = 0 and calculating I m,2 using equation (16). Once I m,2 is obtained, we can proceed to calculate I m, 3 .…”

Section: International Journal Of Antennas and Propagationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A New Method to Calculate Induced Current of Thin Wire over Anisotropic Ground under HPM

Cao

2019

International Journal of Antennas and Propagation

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“…This group of thin-wire techniques is straightforward, easily implemented and less time consuming. With these techniques, a series of extended thinwire models have been proposed for coaxial conductors considering frequency-dependent losses [21,25] and conductors with non-circular cross sections [24]. Note that thin-wire structures must attach to the FDTD edges.…”

Section: Introductionmentioning

confidence: 99%

Thin-Wire Models for Inclined Conductors With Frequency-Dependent Losses

Chen

2020

IEEE Trans. Power Delivery

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This paper presents the FDTD thin-wire models of lossy wire structures with arbitrary inclination for transient analysis, which is difficult to address using traditional FDTD methods. The frequency-dependent losses of the conductors are fully taken into account, and the vector fitting technique is applied to deal with frequency-dependent parameters for time-domain analysis. The bidirectional coupling within the lossy coaxial conductors is modelled. The currents in inner and outer conductors are not necessarily balanced. Three cases are presented for the investigation of wave propagation velocity, wave attenuation, and current distribution. These data are compared with analytical results and numerical results using other models. It is found that the proposed thin-wire models can depict the transient behaviors in the lossy inclined conductors with the velocity error of less than 1%, and the attenuation error of less than 1.5%. Keywords -finite-difference time-domain (FDTD), thin-wire model, inclination, frequency-dependent loss I.

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“…Recently, several advanced thin‐wire models have been proposed. In [14, 15], thin‐wire models for solid wires, hollow tubes, and coaxial conductors considering the frequency‐dependent loss were proposed. The lossy thin‐wire structures with non‐circular cross sections were simulated in [16].…”

Section: Introductionmentioning

confidence: 99%

Stable thin‐wire model of buried pipe‐type power distribution cables for 3D FDTD transient simulation

Ding

et al. 2020

IET Generation Trans & Dist

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Underground cables such as pipe‐type cables are widely used in urban power industry. In this study, an advanced thin‐wire model of the pipe‐type cables is 3D FDTD simulations. In this model, the multi‐conductor cables are represented with two‐level transmission line equations. A stabilising technique with a 1D spatial low‐pass filter is proposed to maintain computational stability. Frequency‐dependent losses are fully considered by using a vector‐fitting technique. The proposed thin‐wire model is validated with the multi‐conductor transmission line theory analytically and the traditional FDTD method numerically. Good agreements are observed. It is found that the simulation maintains stability for 360,000‐time steps. Compared to the traditional FDTD method, the memory space and computation time of the proposed model can be reduced by 73% and 98%, respectively. Induced lightning currents in a cable connection station are analysed. It is found that, without considering soil ionisation and soil stratification, the peak current in the metallic armour is 1.54 times as much as the one with considering these non‐linear effects. It can be reduced by 9.04% and 18.6% if the cable is buried at depths of 1 m and 1.5 m, compared with the case of a 0.5 m buried depth.

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A Technique for Representing Lossy Thin Wires and Coaxial Cables for FDTD-Based Surge Simulations

Cited by 24 publications

References 29 publications

A New Method to Calculate Induced Current of Thin Wire over Anisotropic Ground under HPM

A New Method to Calculate Induced Current of Thin Wire over Anisotropic Ground under HPM

Thin-Wire Models for Inclined Conductors With Frequency-Dependent Losses

Stable thin‐wire model of buried pipe‐type power distribution cables for 3D FDTD transient simulation

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