Description of the Discharge Process in Long Air Gaps Under Lightning Impulse Voltage

Schubert, Uwe; Shirvani, Ali; Schmidt, Uwe

doi:10.1109/tpwrd.2023.3244022

Cited by 3 publications

(4 citation statements)

References 16 publications

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“…The short [1][2][3][4][5][6][7][8] and long [9,10] gap distances are two areas of research that are currently very interested in streamer investigations. The discharge under point-to-plane geometry is one of the most interesting geometries for positive discharge in air in observations of short gap distances.…”

Section: Introductionmentioning

confidence: 99%

“…A spark breakdown is thought to happen every time with/without a Energies 2024, 17, 705 2 of 15 secondary streamer passes through a momentary air gap. Researchers have experimentally investigated the breakdown characteristics using different electrode geometries or configurations, types of applied DC and AC voltages, and gaps of varying lengths in order to uncover breakdown phenomena in air [1,2,9]. They look into extremely irregular electric fields in order to research corona discharges, which can start in the gap prior to a full breakdown (spark) occurring [1][2][3][4][5][6][7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

“…Researchers have experimentally investigated the breakdown characteristics using different electrode geometries or configurations, types of applied DC and AC voltages, and gaps of varying lengths in order to uncover breakdown phenomena in air [1,2,9]. They look into extremely irregular electric fields in order to research corona discharges, which can start in the gap prior to a full breakdown (spark) occurring [1][2][3][4][5][6][7][8][9][10]. The Sigmoid [2] stated that the secondary streamer is a secondary indicator of the impending breakdown rather than the primary cause, based on their observation of the initiation breakdown's characteristics.…”

Section: Introductionmentioning

confidence: 99%

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Rapid Breakdown Time in Positive Impulse Voltages through Spectroscopy Analysis

Ikhwanus,

Morimoto

2024

Energies

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The air discharge phenomenon, characterized by its rapid and transient nature, is inherently unpredictable, emphasizing the need for a comprehensive understanding of its physical interactions. Our experimental setup involved voltage generators producing both positive and negative impulse voltages (±100 kV, ±125 kV, and ±150 kV) at a 3.5 cm gap distance in a needle-to-plane geometry. This setup facilitated the study of individual spectral lines of impulse voltage discharges, with a specific emphasis on examining oxygen transitions through spectroscopy analysis. To explore the influence of photon emission on the breakdown rate, we examined the correlation between decay time, excitation temperature, and peak intensity during the transition from an upper state to a lower state. Our findings reveal that positive impulse voltage discharges more rapidly than negative impulse voltages. This heightened discharge rate is attributed to the higher peak intensities of O II at 313.421 and 241.162 nm, as well as O IV at 337.806 nm, observed in the excited state, as opposed to O I at 777.417 nm in the combination state. The inference drawn from the larger peak intensity suggests that energetic photon emission plays a pivotal role in initiating and expediting electron discharge in positive voltages.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Rapid Breakdown Time in Positive Impulse Voltages through Spectroscopy Analysis

Ikhwanus,

Morimoto

2024

Energies

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“…Traditional parallel spark gap (Figure 1) is a kind of "channeling" lightning protection measure, which has the advantages of simple structure and good economy. However, the inability of a separate parallel gap to actively and quickly extinguish the arc makes it not completely reliable, and the continued burning of the arc is a hidden danger to the stable operation of the power system [3]. Therefore, many research works have been carried out by scholars for the arc extinguishing problem of the protection gap.…”

Section: Introductionmentioning

confidence: 99%

Study on rapid arc quenching in protection gap based on magnetic blowing principle

Shan,

Yang,

Zhou

et al. 2024

J. Phys.: Conf. Ser.

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Parallel protection gap has the advantages of simple structure, good economy, and so on. It is widely used in lightning protection. However, the problem is that the arc’s self-extinguishing ability of the protection gap is poor and prone to tripping the line, hindering its further development. To address this problem, this paper proposes a method of connecting an electromagnet in series next to a protection gap and installing an arc-breaking grid at the gap. By changing the magnetic field distribution in the protective gap, while the arc is stretched, the arc is deflected to break on the arc-breaking grids, thus causing the arc to extinguish quickly. Through a finite element simulation platform, the arc simulation model of this protective gap was established based on the theory of magnetohydrodynamic (MHD) approach. The results of the study show that a fast arc quenching method for parallel protection gaps based on the magnetic blowing principle can extinguish the arc within 5 ms, an 89.4 percent reduction in arc extinguishing time compared to the traditional parallel spark gap. Its arc temperature plummeted to below 2000 K in a short time, which greatly reduces the arc energy and effectively improves the arc extinguishing effect of the protection gap.

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