Modeling of lightning impulse behavior of long air gaps and insulators including predischarge current: Implications on insulation coordination of overhead transmission lines and substations

Mikropoulos, Pantelis N.

doi:10.1016/j.epsr.2015.11.036

Cited by 32 publications

(5 citation statements)

References 28 publications

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“…9, two phases are considered: streamer phase and leader propagation. The former is usually assumed to be completed when the average gradient in the gap reaches a critical value, E0 [28], [57]; other criteria are discussed in [60]. Then, leader propagation begins based on its velocity, dL/dt (Fig.…”

Section: Discussion On Leader Development Modelsmentioning

confidence: 99%

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Effects of Approximating Recorded Lightning Currents With CIGRE Waveforms on Computed Fast-Front Overvoltages and Critical Lightning Currents Causing Flashover to Overhead Transmission Lines

Patsalis

Mikropoulos

Tsovilis

2023

IEEE Trans. Power Delivery

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This work investigates through simulations with the ATP-EMTP program the application of recorded lightning current waveforms to the estimation of fast-front overvoltages and critical lightning currents causing flashover to overhead transmission lines. Typical lines are evaluated with both horizontal (single-circuit) and vertical (double-circuit) phase configurations and AC voltage from 66 kV up to 765 kV. Backflashover as well as shielding failure flashover simulations were performed for several recorded first return-stroke current waveforms of negative downward lightning flashes, as reported in literature. Their approximations with the widely-used CIGRE lightning current waveform were also employed in simulations. CIGRE waveforms, considering the statistical distributions of the front time, maximum steepness, and time to half value, were used as well. A comparison between double-peak waveforms, composed of seven Heidler functions, and their CIGRE approximations is made. The latter generally yield conservative values of overvoltages and critical backflashover currents. The leader development models used for assessing the behavior of insulators and long air gaps under fast-front overvoltages are discussed regarding the criterion for the termination of leader propagation yielding withstand of line insulation.

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Section: Discussion On Leader Development Modelsmentioning

confidence: 99%

“…Insulator flashover CIGRE [28] leader development model with predischarge current [59], [60]; parameters: negative flashover Tower grounding systems…”

Section: Discussionmentioning

confidence: 99%

Effects of Approximating Recorded Lightning Currents With CIGRE Waveforms on Computed Fast-Front Overvoltages and Critical Lightning Currents Causing Flashover to Overhead Transmission Lines

Patsalis

Mikropoulos

Tsovilis

2023

IEEE Trans. Power Delivery

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“…It is well-known that a gas can be considered as an almost perfect insulator at normal state. However, when a high voltage is applied between two electrodes immersed in a gaseous medium, the gas can become a conductor (by ionization) and the dielectric breakdown can occur (NAIDU & KAMARAJU, 1997;DATSIOS & MIKROPOULOS, 2016).…”

Section: Theorymentioning

confidence: 99%

High Sensitivity Envelope Detector Assisted by Microwave Photonics

Gonçalves¹,

Ivo²,

Coutinho³

2022

Smart Systems: Theory and Advances

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Theory and Advances is licensed under CC BY 4.0.This license requires that reuses give credit to the creator. It allows reusers to distribute, remix, adapt, and build upon the material in any medium or format, even for commercial purposes.The content of the work and its data in its form, correctness and reliability are the sole responsibility of the authors, and do not represent the official position of Amplla Publishing. Downloading and sharing of the work is permitted as long as credit is given to the authors. All rights to this edition were ceded to Editora Amplla.

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“…However, the overhead lines of ±800 kV UHVDC transmission lines are very high, the terrain along the longdistance transmission lines is complicate, and it is easy to be disturbed by many natural factors, such as earthquake and lightning [3][4][5]. In order to reduce the probability of direct lightning strike on the transmission lines, the doubleshielded wire is usually used in engineering applications, but it increases the probability of lightning strike on the shielded wire [6][7][8]. erefore, it is necessary to explore the influence mechanism of insulator's insulation performance on the back-flashover lightning withstand performance of ±800 kV UHVDC transmission lines, which is beneficial for providing theoretical basis for stable operation and reliable power supply.…”

Section: Introductionmentioning

confidence: 99%

Study on the Influencing Factors of Insulator on the Back-Flashover Lightning Withstand Performance of ±800 kV UHVDC Transmission Lines

Jiang

Chun-lin

Zhou

2020

Mathematical Problems in Engineering

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The current research results indicate that the insulator’s insulation performance has a very important influence on the back-flashover lightning withstand performance of UHVDC transmission lines, especially for ±800 kV voltage level. However, it is not clear which factors will influence the insulation performance of the insulator, and the influencing mechanism is also not clear yet. To figure out this problem, the insulator’s insulation performance under different conditions has been deeply analyzed and considered to reveal the influence mechanism in this paper, such as the surface hydrophobicity, pollution degree, and the string type. Firstly, the insulator’s model is established using COMSOL software, and the lightning impulse voltage of insulator is calculated and verified with the corresponding experimental data. Then, the ±800 kV UHVDC transmission lines model is constructed using PSCAD software, and back-flashover lightning withstand level and back-flashover rate are calculated by considering the above lightning impulse voltage as the threshold of flashover. Finally, the back-flashover lightning withstand performance of ±800 kV UHVDC transmission lines is deeply analyzed based on different insulators. The simulation results demonstrate that the back-flashover lightning withstand performance of ±800 kV UHVDC transmission lines is obviously weakened with the increase of the pollution degree and slightly weakened with the decrease of the surface hydrophobicity. Considering the same pollution degree, the V-type string insulator has the least influence, while the II-type string insulator has the greatest influences on the back-flashover lightning withstand performance of ±800 kV UHVDC transmission lines. The research results are beneficial for providing theoretical basis for stable operation and reliable power supply of ±800 kV UHVDC transmission lines.

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Modeling of lightning impulse behavior of long air gaps and insulators including predischarge current: Implications on insulation coordination of overhead transmission lines and substations

Cited by 32 publications

References 28 publications

Effects of Approximating Recorded Lightning Currents With CIGRE Waveforms on Computed Fast-Front Overvoltages and Critical Lightning Currents Causing Flashover to Overhead Transmission Lines

Effects of Approximating Recorded Lightning Currents With CIGRE Waveforms on Computed Fast-Front Overvoltages and Critical Lightning Currents Causing Flashover to Overhead Transmission Lines

High Sensitivity Envelope Detector Assisted by Microwave Photonics

Study on the Influencing Factors of Insulator on the Back-Flashover Lightning Withstand Performance of ±800 kV UHVDC Transmission Lines

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