Enhancing the lightning performance of overhead transmission lines with optimal EGLA and downstream shield wire placement in mountainous areas: a complete study

Ahmadi, Mahmoud Eshagh; Niasati, Mohsen; Barzegar-Bafrooei, Mohammad Reza

doi:10.1049/iet-smt.2019.0074

Cited by 14 publications

(25 citation statements)

References 30 publications

(53 reference statements)

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“…Statistics demonstrate that surge arrester failures created by lightning strikes are about 80% of the total failure number. Therefore, it may cause to the SAs damage during operation due to the influence of overvoltage with large amplitudes of stored energy [10].…”

Section: Simulation Resultsmentioning

confidence: 99%

“…Moreover, Equation (8) has been applied to adjust the EGLA gap, which is in series with the IEEE model [13].

\begin{equation} \def\eqcellsep{&}\begin{array}{l} {d_{\max }} = \dfrac{{{V_{CFO}} \times 0.85}}{{{E_0}}}\\[20pt] {d_{\min}} = 39.37{\left[ {\dfrac{{{e^{\frac{V}{{750}}}} - 1}}{{0.55}}} \right]^{0.833}}\quad ({\rm Inches}) \end{array} \end{equation}

where

{d_{\min }}

(238 mm) and

{d_{\max }}

(417 mm) are minimum and maximum EGLA gap, respectively, V CFO is critical voltage of insulator string (290 kV) and E 0 (590.55 kV/m) is corona initiation gradient [10, 13]. The gap distance value can obtain by averaging minimum and maximum externally gaps of line arrester as expressed in ref.…”

Section: Transmission Line Equipment Modelmentioning

confidence: 99%

“…The installation effect of EGLA on the BF probability has been considered in a double circuit line in the presence of downstream shield wire. By replacing the EGLA in different phases, the best scenario for less BF amount has been represented [10]. The EGLA placement in a 220 kV double circuit have been inquired in [12].…”

Section: Introductionmentioning

confidence: 99%

“…Also, with no voltage applied to the varistor after an impulse, the varistors do not need such sophisticated formulations and processing. Difficult insulation coordination and low performance against switching transient overvoltage are disadvantages of EGLA [10,11].…”

Section: Introductionmentioning

confidence: 99%

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Externally gapped line arrester performance in high voltage transmission line using frequency grounding system: Absorbed energy and expected life assessment

Khodsuz

2022

IET Science Measure & Tech

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Service unavailability of transmission lines, due to the direct and indirect lightning strikes, is evaluated as a challenging issue within electric companies. The lightning event can produce dangerous overvoltage, equipment failures, and power supply interruptions. Here, externally gapped line arresters (EGLAs) performances installed on a 63 kV transmission line are modelled using EMTP‐ATP to investigate their capability to withstand current and energy discharged by lightning strokes during back flashover phenomena. Frequency behaviour of the grounding system impedance, first and subsequent lightning current parameters effects on insulators back flashover and lightning flashover failure rate have been considered by Monte‐Carlo method. Then, extensive analysis has been carried out to study the absorbed energy of the EGLA and its expected life. The results show the dependency of failure rate and the EGLA expected life on the soil resistivity and lightning strike parameters. The selected EGLA must be provided sufficient lightning protection to the transmission line based on its absorbed energy capability, the soil and lightning parameters and be complied with the discharge energy capability requirement specified by the utility company.

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Section: Simulation Resultsmentioning

confidence: 99%

“…Moreover, Equation (8) has been applied to adjust the EGLA gap, which is in series with the IEEE model [13].

\begin{equation} \def\eqcellsep{&}\begin{array}{l} {d_{\max }} = \dfrac{{{V_{CFO}} \times 0.85}}{{{E_0}}}\\[20pt] {d_{\min}} = 39.37{\left[ {\dfrac{{{e^{\frac{V}{{750}}}} - 1}}{{0.55}}} \right]^{0.833}}\quad ({\rm Inches}) \end{array} \end{equation}

where

{d_{\min }}

(238 mm) and

{d_{\max }}

Section: Transmission Line Equipment Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Externally gapped line arrester performance in high voltage transmission line using frequency grounding system: Absorbed energy and expected life assessment

Khodsuz

2022

IET Science Measure & Tech

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show abstract

“…Most of the problems facing power grids are caused by lightning overvoltages, which result in power supply interruptions and apparatus deterioration and malfunctions. Lightning strikes are categorized into two types, direct and indirect strikes [12,13], as shown in Figure 1. Indirect strikes result in less overvoltage, which usually causes less damage to the insulator.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of the Transient Overvoltages of HVDC Transmission Lines Caused by Lightning Strikes

et al. 2022

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High-voltage direct-current (HVDC) transmission systems are considered an outstanding solution due to high electrical losses emerging from long-distance transmission. However, HVDC transmission lines (TLs) are vulnerable to lightning strikes. In this work, the Yunnan-Guizhou 500 kV HVDC transmission system is used as a case study to evaluate the impact of lightning strikes on DC-TL overvoltages, as no research studies have been conducted to assess the lightning transient behavior of DC-TLs. A comprehensive investigation of the 500 kV DC-TL transient performance during lightning strikes is performed, taking into account different technical aspects that have not been studied in detail by previous researchers. Additionally, analysis of the back-flashover phenomenon has not been conducted well in previous work, and results on the effect of changing the lightning strike current peak and tower grounding resistance on shielding-failure flashover are quite limited. The distributed-parameter model is used to represent the DC-TL using the electromagnetic transients program (EMTP), considering real parameters of shielding wires and DC towers to study the lightning impact in the case of back-flashover and shielding-failure phenomena. Lightning strike is applied to the shielding wire, and the impact of increasing the peak value of lightning current is investigated on the back-flashover occurrence. Moreover, the influence of tower grounding resistance variation on the transient overvoltages across the tower body and back-flashover phenomenon is evaluated. From the simulation results, increasing the lightning current peak and grounding resistance results in higher overvoltages across the tower body, which increases the probability of back-flashover. Additionally, the shielding failure of the TL is assumed, and the variation impact of the lightning current peak and grounding resistance on shielding-failure flashover is investigated. The results show that the impact of the lightning current peak has a more significant impact than the grounding resistance in the case of shielding-failure flashover.

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Analysis of lightning transient performance of 132 kV transmission line connected to Miramar wind farm: A case study

et al. 2022

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Enhancing the lightning performance of overhead transmission lines with optimal EGLA and downstream shield wire placement in mountainous areas: a complete study

Cited by 14 publications

References 30 publications

Externally gapped line arrester performance in high voltage transmission line using frequency grounding system: Absorbed energy and expected life assessment

Externally gapped line arrester performance in high voltage transmission line using frequency grounding system: Absorbed energy and expected life assessment

Evaluation of the Transient Overvoltages of HVDC Transmission Lines Caused by Lightning Strikes

Analysis of lightning transient performance of 132 kV transmission line connected to Miramar wind farm: A case study

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