Lightning-induced overvoltages in power lines: validity of various approximations made in overvoltage calculations

Cooray, Vernon; Scuka, V.

doi:10.1109/15.736222

Cited by 87 publications

(32 citation statements)

References 21 publications

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“…The line parameters include the longitudinal ground impedance and the transverse ground admittance, which are both frequency-dependent. The latter can generally be neglected for typical overhead lines, due to its small contribution to the overall transverse admittance of the line [6]. Rachidi et al [7] showed that for lines whose length does not exceed a certain "critical" value (typically 2 km) and for the strike point equidistant from the line terminations, the surge propagation along the line is not appreciably affected by the ground finite conductivity, and therefore, the ground impedance can also be neglected.…”

mentioning

confidence: 99%

Analysis of Lightning-Induced Voltages on Overhead Lines Using a 2-D FDTD Method and Agrawal Coupling Model

Heming

Zhou

Rakov

et al. 2008

IEEE Trans. Electromagn. Compat.

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mentioning

confidence: 99%

Analysis of Lightning-Induced Voltages on Overhead Lines Using a 2-D FDTD Method and Agrawal Coupling Model

Heming

Zhou

Rakov

et al. 2008

IEEE Trans. Electromagn. Compat.

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“…This paper reports on the exact numerical evaluation of the electromagnetic fields over a lossy ground for a realistic lightning current source (transmission line model) by improving the computational methods and we present the numerical results as a function of different parameters. Then we compare our numerical computational results with previous approximations (Zenneck, and Cooray-Rubinstein (Cooray, 1992;Rubinstein, 1996;Cooray and Scuka, 1998) approximations) and we discuss their validity limit. Finally we recommend you to use the present numerical computaions for this problem because we have reduced computer time by means of newly developed computation algorithms described in this paper.…”

Section: Introductionmentioning

confidence: 99%

“…Then Cooray (1992) and Cooray and Scuka (1998) and Rubinstein (1996) (The Cooray-Rubinstein expression has been discussed by Wait (1997).) have proposed their approximations for short and intermediate distances (200m ≤ r ≤ 1.5km), and so this Cooray and Rubinstein approximation is compared with our computations in order to find out the usefulness of our computational method where the observing point P is located at (r, ϕ, h) as in Fig.1, and the quantities with the superscript ∞ are those for the perfectly conducting ground.…”

Section: Formulation and Numerical Computations Ofmentioning

confidence: 99%

“…Zeddam and Degauque (1990) have discussed some sophisticated approximations to the rigorous theory, in particular the Norton's and the Bannsister's approaches and have defined their validity limits in terms of frequency and distance of the observation point to the lightning channel. Recently, Cooray (1992) and Cooray and Scuka (1998) have made the extensive study on the comparison of different approximations. However it is highly desirable for us to estimate the numerical integrations for any combinations of arbitrary parameters (frequency, distance, ground conductivity etc.)…”

Section: Introductionmentioning

confidence: 99%

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Numerical Aspects in the Calculation of the Transient Lightning Electromagnetic Radiation Over Lossy Ground

Tsuji

Hayakawa

2004

IEEJ Trans. FM

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The propagation of lightning electromagnetic radiation over a lossy ground has been investigated numerically with the combined use of a newly developed computer algorithm for Sommerfeld integrals and the fast numerical inverse Laplace transform. The transmission line model has been adopted as the lightning current model and we have dealt with lightning discharges with sharp initial peak. The dependences of the radiation fields (especially horizontal electric field) on ground conductivity, distance etc. have been extensively studied, with a special reference to its comparison with previous approximations by Zenneck and Cooray and Rubinstein. Based on these comparisons, we have found that our numerical methods are effective when calculating the radiation field from the lightning for any combinations of the parameters including ground conductivity, distance etc.

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“…When frequency domain method is involved, the lightning channel above the ground is always regarded as a vertical electric dipole. The Sommerfeld convolution integral is introduced, but it is difficult to carry out the integral numerically [11][12][13][14][15][16].…”

Section: Introductionmentioning

confidence: 99%

Induced Voltage on the Overhead Line at Oil Exploiting Port Under Lightning Strike

Meng¹,

Zhou²,

Yang³

2014

PIER

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Abstract-In this paper, a computational model is established for the finite-difference time-domain analyses of induced voltage on the overhead line at oil exploiting port under lightning strike. The MTLL approximate formulation is used to simulate the lightning strike, and convolutional perfectly matched layers are used to truncate the computational domain. A two-step method is established to calculate the coupling to the overhead lines to reduce the huge computational domain of the conventional 3-D FDTD simulation. Parallel implementation is introduced for the second-step calculation to overcome the memory storage limit of a single computer. With this model, the electromagnetic field at the adjacent areas and the induced voltage on the overhead line are studied when lightning strikes an oil derrick. It is demonstrated that the electromagnetic field decreases as the distance from the oil derrick increases, but the vertical field decrease much slower than the horizontal field. It is also shown that the transversely located overhead line will introduce lower voltage than the radially located line. As the length of the overhead line increases, the induced voltage increases and the low-frequency induction is strengthened. The overhead line should be set as low as possible to reduce the induced voltage.

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Lightning-induced overvoltages in power lines: validity of various approximations made in overvoltage calculations

Cited by 87 publications

References 21 publications

Analysis of Lightning-Induced Voltages on Overhead Lines Using a 2-D FDTD Method and Agrawal Coupling Model

Analysis of Lightning-Induced Voltages on Overhead Lines Using a 2-D FDTD Method and Agrawal Coupling Model

Numerical Aspects in the Calculation of the Transient Lightning Electromagnetic Radiation Over Lossy Ground

Induced Voltage on the Overhead Line at Oil Exploiting Port Under Lightning Strike

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