Verifying the Computational Method of Transient Performance with Respect to Grounding Systems based on the FD-TD Method.

Tanabe, Kazuo; Asakawa, Akira; Sakae, Maki; Wada, M.; Sugimoto, Hitoshi

doi:10.1541/ieejpes.123.358

Cited by 13 publications

(8 citation statements)

References 4 publications

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“…The FDTD waveforms in Fig. agree well with the FDTD waveforms calculated by Tanabe and colleagues (not shown in the diagram). The required computing time and memory size (on a PC with a 3.2 GHz CPU) were about 360 min and 1500 MB in the case of TLM, and about 10 min and 520 MB in the case of FDTD.…”

Section: Application To the Analysis Of Grounding Electrode Surgessupporting

confidence: 84%

“…In this paper, we explain how to handle thin-wire conductors and an imperfectly conducting ground in the TLM method. In addition, we report simulations by the TLM and FDTD methods of the experiments of Tanabe and colleagues on surge location in parallelepiped grounding electrodes and square-loop grounding electrodes [11,12]. By comparison between the experiments and the TLM and FDTD results, we show that the TLM method offers sufficient accuracy in the surge analysis of grounding electrodes.…”

Section: Introductionmentioning

confidence: 88%

“…The voltage line was insulated from the grounding electrode and current line, and only an induced current flowed in it; hence we may assume that a difference in the voltage line radius has no substantial effect on the results of the current and voltage calculations. The length of grounding electrodes at the ends of the current and voltage lines was 1.5 m. The parallelepiped grounding electrode subject to analysis had a cross section of 0.5 m × 0.5 m and a length of 3 m. With an 800‐Ω resistance connected in series, a pulse generator was set to output a square voltage as follows :

\begin{matrix} true \\ right (}, \begin{matrix} V = V_{trueprefixmax} (e^{- a_{1} t} - e^{- a_{2} t}) / A_{0} \times {prefixsin}^{2} (ω_{0} t) (t \geq 1.5 T_{f}) \\ V = V_{trueprefixmax} (e^{- a_{1} t} - e^{- a_{2} t}) / A_{0} (1.5 T_{f} \geq t) \\ α_{1} = 0.693147180 / T_{t}, a_{2} = 2.558427881 / T_{f} \\ t_{0} - ln [a_{1} / a_{2}] / (a_{1} - a_{2}), A_{0} = e^{- a_{1} t_{0}} - e^{- a_{2} t_{2}}, \\ ω_{0} = π / 3 T_{f} \end{matrix}) . \end{matrix}

…”

Section: Application To the Analysis Of Grounding Electrode Surgesmentioning

confidence: 99%

“…TLM‐ and FDTD‐calculated waveforms of injected current and voltage generated at each corner of square loop grounding electrode and corresponding waveforms measured by Tanabe and colleagues .…”

Section: Application To the Analysis Of Grounding Electrode Surgesmentioning

confidence: 99%

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A TLM‐Based Surge Analysis of Grounding Electrodes

Yuda

Baba

Nagaoka

et al. 2014

Electrical Engineering Japan

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SUMMARYIn this paper, representations of a perfectly conducting thin wire and an imperfectly conducting medium in the transmission line modeling (TLM) calculation are briefly explained. Then, the method is applied to analyzing surge responses of a vertical parallelepiped grounding electrode and a square-loop grounding electrode. Surge responses calculated using the TLM method agree reasonably well with the corresponding responses measured and calculated using the finite-difference time-domain method. It is probably the first time that surge responses of grounding electrodes have been analyzed reasonably accurately using the TLM method. C⃝

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Section: Application To the Analysis Of Grounding Electrode Surgessupporting

confidence: 84%

Section: Introductionmentioning

confidence: 88%

\begin{matrix} true \\ right (}, \begin{matrix} V = V_{trueprefixmax} (e^{- a_{1} t} - e^{- a_{2} t}) / A_{0} \times {prefixsin}^{2} (ω_{0} t) (t \geq 1.5 T_{f}) \\ V = V_{trueprefixmax} (e^{- a_{1} t} - e^{- a_{2} t}) / A_{0} (1.5 T_{f} \geq t) \\ α_{1} = 0.693147180 / T_{t}, a_{2} = 2.558427881 / T_{f} \\ t_{0} - ln [a_{1} / a_{2}] / (a_{1} - a_{2}), A_{0} = e^{- a_{1} t_{0}} - e^{- a_{2} t_{2}}, \\ ω_{0} = π / 3 T_{f} \end{matrix}) . \end{matrix}

…”

Section: Application To the Analysis Of Grounding Electrode Surgesmentioning

confidence: 99%

Section: Application To the Analysis Of Grounding Electrode Surgesmentioning

confidence: 99%

See 2 more Smart Citations

A TLM‐Based Surge Analysis of Grounding Electrodes

Yuda

Baba

Nagaoka

et al. 2014

Electrical Engineering Japan

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“…Recently, a method for directly solving Maxwell's equations has often been used for calculations in which it is difficult to apply the conventional methods based on circuit theory, such as surge analysis of three-dimensional structures. Among them, the finite difference time domain (FDTD) method [2] can easily deal with conductors and dielectrics, and is applied to surge analysis in many fields such as voltage calculation across arcing horns of transmission line towers [3,4], transient response analysis of a ground electrode [5], and calculation of induced voltages on a control line by current flowing through a grounding grid [6]. This report shows the results of studying the branch aspect of a lightning surge current in an actual microwave relay station and the applicability of the FDTD method for studying lightning protection measures.…”

Section: Introductionmentioning

confidence: 99%

Applying FDTD Simulation to Lightning Surge Route Analysis in Microwave Relay Stations

Kono¹,

Fujino²,

Yokoyama³

et al. 2011

Journal of International Council on Electrical Engineering

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-Microwave multiple radio relay stations are often built on mountains, and the stations are susceptible to damage from lightning. Therefore, it is important to take adequate lightning protection measures to ensure that communication devices are not damaged by any lightning surge current that penetrates from a lightning rod fitted on such stations. In most cases, the penetration route of the lightning surge current is uncertain, and it is difficult to specifically evaluate the effectiveness of measures against lightning. We calculated the branch aspect of lightning surge current in actual microwave relay stations using the finite difference time domain (FDTD) method, which is one way to numerically analyze electromagnetic fields, to directly solve Maxwell's equations. By comparing the calculated results with measured results obtained by injecting a pulse current into a microwave relay station, we verified that the current peak value of the calculated results corresponded with the measured results well, both when a steel tower was located on the ground and when it was located on the roof of a microwave relay station. We confirmed that the FDTD method can be used to understand the branch current of lightning surges and to study lightning protection measures at microwave relay stations.

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Impedance with respect to vertical and rotational symmetric grounding electrodes and its computational results from full-wave analysis using FD-TD method

Tanabe

Kawamoto

2005 International Symposium on Electromagnetic Compatibility, 2005. EMC 2005.

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Verifying the Computational Method of Transient Performance with Respect to Grounding Systems based on the FD-TD Method.

Cited by 13 publications

References 4 publications

A TLM‐Based Surge Analysis of Grounding Electrodes

A TLM‐Based Surge Analysis of Grounding Electrodes

Applying FDTD Simulation to Lightning Surge Route Analysis in Microwave Relay Stations

Impedance with respect to vertical and rotational symmetric grounding electrodes and its computational results from full-wave analysis using FD-TD method

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