Novel method for analyzing dynamic behavior of grounding systems based on the finite-difference time-domain method

Tanabe, Kazuo

doi:10.1109/39.948615

Cited by 46 publications

(9 citation statements)

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“…The extended nature of counterpoises makes such grounding systems susceptible to induced effects of electromagnetic fields generated by nearby lightning return strokes. Studies of lightninginduced currents in horizontal grounding electrodes have been conducted previously by Tsumura et al [2], Yamaguchi et al [3], and Tanabe [4], and in buried cables by Petrache et al [5] and Paolone et al [6]. Significant currents in a vertically extended metallic conductor in response to nearby lightning can occur in two different ways: 1) via coupling of the lightning electromagnetic fields resulting in induced conduction current Manuscript received March 25, 2007.…”

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confidence: 99%

Experimental Study of Lightning-Induced Currents in a Buried Loop Conductor and a Grounded Vertical Conductor

Schoene

Uman

Rakov

et al. 2008

IEEE Trans. Electromagn. Compat.

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confidence: 99%

Experimental Study of Lightning-Induced Currents in a Buried Loop Conductor and a Grounded Vertical Conductor

Schoene

Uman

Rakov

et al. 2008

IEEE Trans. Electromagn. Compat.

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“…Furthermore, the above observation is related to wave propagation close to the earth's surface at a very high frequency (known as Sommerfeld propagation) [18], which is very hard to analyze and investigate. It is expected that a numerical electromagnetic approach such as a finite-difference time-domain method can provide a solution for the above [19].…”

Section: Measuring Methods and Accuraciesmentioning

confidence: 99%

Modeling of a buried conductor for an electromagnetic transient simulation

Ametani

Soyama

Ishibashi

et al. 2006

IEEJ Transactions Elec Engng

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The paper has proposed a distributed-line model of a buried bare conductor with horizontal and vertical configuration by assuming an artificial insulator outside of the bare conductor so that the characteristic impedance and the propagation velocity of the buried conductor is evaluated as an insulated conductor (cable) by the cable constants/parameters of the EMTP. A shunt admittance is added to the conductor at every short distance to represent currents flowing into the earth from the original bare conductor. The admittance circuit and the parameters are evaluated either by experimental results or by published references of grounding electrodes. The model circuit has been applied to simulate transient currents and voltages on horizontal and vertical buried conductors, and the simulation results are compared with the measured results. It has been observed that the simulation results of the currents agree satisfactorily with the measured results, but the results of the voltages do not seem satisfactory. The reason for this has been discussed based on the measured results. 

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“…In surge analysis, the FDTD or FI method is applied to elucidating the transient behavior of grounding electrodes [4–10] and vertical structures such as transmission towers [11] and buildings [12]. Besides NEA using the FDTD or FI method, there are theoretical methods, methods based on the circuit theory, and methods using NEA by the method of moment (MoM), and all such methods have been used to solve the surge problem.…”

Section: Introductionmentioning

confidence: 99%

Performance of proposed thin‐wire model in finite difference time domain method

Tanabe

2011

IEEJ Transactions Elec Engng

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Thin‐wire approximation in the finite difference time domain (FDTD) method is important in saving computer resources and truncating central processing unit (CPU) time. Previously, thin wires were mainly realized using the true thin wire (TTW) model, in which electric field components along the wire axis are set at zero, and three methods, in which electric field components along the wire axis are also set at zero and the medium around thin wires is replaced depending on wire radius, are hereafter called the RM model. The former is the most conventional and widely used method; however, its resultant radius is 0.23Δs, supposing that the space under consideration is divided by cubic cells with a Δs of the side length of FDTD cells. The first method of the RM model can realize thin wires having a radius of about 0.15Δs under the conditions we used, in which the time interval is set at a value which is slightly less than Δtc, e.g. 0.9999tc, where Δtc is defined by the Courant condition; in the case of a thin wire having a radius less than 0.15Δs, the FDTD computation suffers from numerical instability. The second method can realize a thin wire having a radius of about 10−4Δs. We need some changes in the numerical electromagnetic analysis program based on the FDTD method to employ these models. The third of the RM model, which has already been proposed by the author and in which the relative permittivity and relative permeability of four FDTD cells closest to a thin wire are replaced according to the radius of the thin wire and Δs, could realize thin wires having a radius of about 10−6Δs without changing the program and numerical instability. In this paper, the third model is extensively investigated and it is demonstrated that we can deal with a thin wire with a radius of about 10−9Δs without numerical instability. The maximum difference in the evaluation of the surge impedance of an open‐ended horizontal wire located 5 m above a perfectly conducting ground is less than 5%. We can easily use the third model even though the program, which is available, has no the specific function of thin‐wire approximation. © 2011 Institute of Electrical Engineers of Japan. Published by John Wiley & Sons, Inc.

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Novel method for analyzing dynamic behavior of grounding systems based on the finite-difference time-domain method

Cited by 46 publications

References 1 publication

Experimental Study of Lightning-Induced Currents in a Buried Loop Conductor and a Grounded Vertical Conductor

Experimental Study of Lightning-Induced Currents in a Buried Loop Conductor and a Grounded Vertical Conductor

Modeling of a buried conductor for an electromagnetic transient simulation

Performance of proposed thin‐wire model in finite difference time domain method

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