The effect of wide band modeling of tower-footing grounding system on the lightning performance of transmission lines: A probabilistic evaluation

Shariatinasab, Reza; Gholinezhad, Javad; Sheshyekani, Keyhan; Alemi, Mohamad Reza

doi:10.1016/j.epsr.2016.06.040

Cited by 29 publications

(11 citation statements)

References 29 publications

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Section: Pgfrpc Cross-arm: Current Issues and Problemsmentioning

confidence: 99%

“…By using experimental and simulation works, Rawi et al [1] showed that PGFRPC cross-arms have a higher dielectric strength compared to wooden cross-arms in terms of performance against lightning strikes, as shown in Figure 4. Other researchers tried to overcome the lightning performance of transmission lines by developing grounding systems for transmission line towers [119,120]. As the main objective of cross-arm design must counter the weight of the transmission conductor at a certain height from the ground, most researchers have struggled to come up with improvements of the cross-arm design [121][122][123].…”

Section: Pgfrpc Cross-arm: Current Issues and Problemsmentioning

confidence: 99%

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Potential of Honeycomb-Filled Composite Structure in Composite Cross-Arm Component: A Review on Recent Progress and Its Mechanical Properties

et al. 2021

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Nowadays, pultruded glass fiber-reinforced polymer composite (PGFRPC) structures have been used widely for cross-arms in high transmission towers. These composite structures have replaced cross-arms of conventional materials like wood due to several factors, such as better strength, superior resistance to environmental degradation, reduced weight, and comparatively cheaper maintenance. However, lately, several performance failures have been found on existing cross-arm members, caused by moisture, temperature changes in the atmosphere, and other environmental factors, which may lead to a complete failure or reduced service life. As a potential solution for this problem, enhancing PGFRPC with honeycomb-filled composite structures will become a possible alternative that can sustain a longer service life compared to that of existing cross-arms. This is due to the new composite structures’ superior performance under mechanical duress in providing better stiffness, excellence in flexural characteristics, good energy absorption, and increased load-carrying capacity. Although there has been a lack of previous research done on the enhancement of existing composite cross-arms in applications for high transmission towers, several studies on the enhancement of hollow beams and tubes have been done. This paper provides a state-of-the-art review study on the mechanical efficiency of both PGFRPC structures and honeycomb-filled composite sandwich structures in experimental and analytical terms.

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Section: Pgfrpc Cross-arm: Current Issues and Problemsmentioning

confidence: 99%

Section: Pgfrpc Cross-arm: Current Issues and Problemsmentioning

confidence: 99%

Potential of Honeycomb-Filled Composite Structure in Composite Cross-Arm Component: A Review on Recent Progress and Its Mechanical Properties

et al. 2021

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“…If the samples are independent, laws of large numbers ensure that the approximation can be made as accurate as desired by increasing the sample size. In this paper, the Monte Carlo simulation method considering 30,000 samples is used to include the statistical characteristics of lightning phenomena into the performed analysis [18].…”

Section: Monte Carlomentioning

confidence: 99%

Monte‐Carlo‐based simulation and investigation of 230 kV transmission lines outage due to lightning

et al. 2020

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Here, using the probabilistic evaluation based on the Monte Carlo method, back-flashover rate and shielding failure flashover rate of 230 kV overhead transmission lines in the western regions of Iran are evaluated. To such an aim, first, the number of thunderstorm days per year is collected from the reported weather information in order to determine the ground flash density. Then, using MRU-200 equipment, the tower-footing resistance of several towers is measured. Matlab® software is used in order to produce lightning surges considering its probabilistic nature and randomly distribution on the ground to evaluate striking distance based on the geometric model. Then, calculated parameters are transferred to EMTP-RV software by establishing a link to perform the transient simulation and report the results for modelled 230 kV transmission line. Finally, considering IEEE-1243 standard, it is shown that due to high ground flash density, using 230 kV tower with one shield wire is not sufficient to protect the line against lightning phenomena.

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“…The calculation of the parameters of grounding structure is considered as an optimization problem and tower footing resistance is calculated considering soil resistivity and the geometric characteristics of the grounding system. Recently, the effect of frequency dependence modeling of soil resistivity and permittivity on the response of grounding electrodes due to lightning surges has been analyzed (Alipio & Visacro, 2014;Shariatinasab, Gholinezhad, Sheshyekani, & Alemi, 2016) This paper presents a comprehensive study to accurate modeling of the grounding systems and analyzing the lightning performance of TLs. In this study both the vertical and nonvertical lightning stroke have been considered and the effect of different modeling of grounding system on outage rate of TL is investigated.…”

Section: Introductionmentioning

confidence: 99%

The effect of grounding system modeling on lightning-related studies of transmission lines

Shariatinasab¹,

Gholinezhad²

2017

Journal of Applied Research and Technology

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Un-accurate modeling of power system may cause to under or over-design the insulation, which in turn, leads to increase in the investment and/or maintenance cost of the network protection against lightning overvoltages. The grounding system is an effective parameter on the magnitude of the lightning overvoltages and insulation coordination of high voltage transmission lines (TLs). This paper presents a comprehensive evaluation of the effect of grounding electrode impedance on the estimation of overvoltages caused by lightning strokes, in which both the vertical and non-vertical strokes are considered. In the presented study, static and wide-band model of the tower-footing grounding system is adopted assuming the soil electrical parameters to be either constant or frequency dependent. Also, the effect of modeling type of grounding system is considered on the TLs' reliability indices. The study was performed on a typical 400-kV transmission line which is modeled in EMTP-RV. From the simulation results, it is found that the outage rate of TLs is markedly affected by the model of the tower footing grounding system. This effect is more pronounced when the soil electrical parameters are frequency dependent. It is also concluded that, in addition to the lightning overvoltages, the unavailability of the TLs is significantly affected by wide-band model of grounding system, non-vertical lightning strokes and soil resistivity.

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The effect of wide band modeling of tower-footing grounding system on the lightning performance of transmission lines: A probabilistic evaluation

Cited by 29 publications

References 29 publications

Potential of Honeycomb-Filled Composite Structure in Composite Cross-Arm Component: A Review on Recent Progress and Its Mechanical Properties

Potential of Honeycomb-Filled Composite Structure in Composite Cross-Arm Component: A Review on Recent Progress and Its Mechanical Properties

Monte‐Carlo‐based simulation and investigation of 230 kV transmission lines outage due to lightning

The effect of grounding system modeling on lightning-related studies of transmission lines

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