Study on the Effect of Helium on the Dielectric Strength of Medium-Voltage Vacuum Interrupters

Węgierek, P.; Lech, Michał; Kostyła, Damian; Kozak, C.

doi:10.3390/en14133742

Cited by 4 publications

(4 citation statements)

References 24 publications

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“…This is therefore an opportunity to increase the reliability of electrical equipment, which is in line with current trends in the electric power industry. In addition, the use of this type of insulating medium is completely safe for the environment and upholds the environmental trend of eliminating greenhouse gases from the atmosphere [27][28][29][30].…”

Section: Discussionmentioning

confidence: 99%

Effect of selected parameters on the electrical strength of a high-voltage vacuum insulation system

2024

Archives of Electrical Engineering

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The article presents the results of laboratory measurements of 𝑈 𝑑 breakdown voltages in a high-voltage vacuum insulating system for different pressures, contact gaps, type of electrode contacts and type of residual gas inside the discharge chamber. First of all, the electrical strength of the discharge chamber with a contact system terminated with contact pads made of W 70 Cu 30 and Cu 75 Cr 25 material was compared for selected values of contact gaps. It was found that below a pressure of 𝑝 = 3.0 × 10 −1 Pa the electrical strength reaches an approximately constant value for each of the set contact gaps 𝑑. Analytical relationships were determined to calculate this value for each of the contact pads used. Above a pressure of 𝑝 = 3.0 × 10 −1 Pa, the measured values of 𝑈 𝑑 breakdown voltages decrease sharply. The values of breakdown voltages in the discharge chamber with residual gases in the form of air, argon, neon and helium were also determined for selected values of contact gaps 𝑑. Depending on the residual gases used, significant differences were noted in the values of pressure 𝑝 at which the loss of insulating properties in the discharge chamber occurred. These values were 3.3 × 10 −1 Pa for argon, 4.1 × 10 −1 Pa for air, 6.4 × 10 −1 Pa for neon, and 2.55 × 10 0 Pa for helium, respectively.

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Section: Discussionmentioning

confidence: 99%

Effect of selected parameters on the electrical strength of a high-voltage vacuum insulation system

2024

Archives of Electrical Engineering

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“…Additionally, when reading the pressure values from the vacuum gauges, it was necessary to take into account the calibration factors and characteristics provided by the head manufacturer, for each of the gases used in the measurements. Once these factors were taken into account, the actual pressure value in the discharge chamber was correctly determined during electrical strength testing [8,29].…”

Section: Research Stands Materials and Methodsmentioning

confidence: 99%

“…In terms of industrial applications, recent publications in the scientific area under review are mainly concerned with insulating alternatives to harmful sulfur hexafluoride (SF 6 ) and the detailed analysis of electric arc burning processes in vacuum [8][9][10][11][12]. In addition to the commonly produced extinguishing chambers based on vacuum or sulfur hexafluoride, mixtures of SF 6 gas with nitrogen, in the ratio of 40% SF 6 and 60% N 2 , are currently encountered.…”

Section: Introduction 1current Research Directions Related To Low Pre...mentioning

confidence: 99%

Breakdown Initiation and Electrical Strength of a Vacuum Insulating System in the Environment of Selected Noble Gases at AC Voltage

Lech¹,

Węgierek²

2022

Energies

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This paper presents the results of testing the electrical strength of an insulating system in a vacuum obtained from three noble gases: argon, neon, helium, and air. The breakdown voltages were measured for contact gaps of 1 mm and 2 mm. A difference was observed in the pressure range where the electrical strength was kept constant. The chamber filled with helium residual gases lost its insulating properties at the highest pressure among the tested gases (2.00 × 100 Pa at contact gap d = 2 mm), while the chamber filled with argon gas lost its insulating properties at the lowest pressure among the tested gases (2.00 × 10−1 Pa at contact gap d = 2 mm). After a decrease in electrical strength, an intense glow discharge was observed. A theoretical description related to the initiation of an electrical breakdown in vacuum insulating systems is also presented. The situation in which the discharge chamber with a contact system was filled with the mentioned gases was analyzed. The mean free paths of the electrons and molecules as well as the velocities and energies of the electrons accelerated by the voltage applied to electrodes were calculated. The obtained results were related to the measurement parameters and analyzed in terms of the discharge development. The results of the research suggest alternatives for the further development of vacuum-extinguishing chambers used in environmentally-friendly electrical switchgear by increasing the rated operating pressure, maintaining the required electrical strength values, and thus facilitating the operation due to greater certainty in regard tomaintaining the integrity of such a vacuum interrupter.

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“…Bearing in mind ecological aspects and the need to modernize the network infrastructure, the research group to which the authors of the article belong has successfully developed an innovative medium-voltage overhead vacuum disconnector in a closed housing, designed for smart grid (EKTOS) networks in which the dielectric strength of connecting chambers has been increased by using low-pressure helium admixtures as a medium to extinguish the electric arc [6]. Thanks to this solution, the device meets the latest ecological standards and also retains the required dielectric strength over a larger pressure range.…”

Section: Introductionmentioning

confidence: 99%

Pressure Monitoring in Medium-Voltage Vacuum Interrupters

Węgierek,

Kostyła,

Lech

et al. 2023

Energies

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Innovation in the economy is closely tied to energy development, encompassing the exploration of new energy sources, increased energy production efficiency, and the integration of diverse energy sources for safe and effective supply to industries and households. Outdated energy infrastructure disrupts electricity continuity and hampers economic innovation. Power interruptions lead to higher SAIDI and SAIFI reliability indices. Quality and reliability requirements have sparked interest in enclosed energy devices. Vacuum technology has been pivotal in electrical switchgear insulation and arc-quenching for over four decades. However, the lack of real-time pressure monitoring systems for vacuum equipment, especially enclosed disconnectors, limits their use as isolation connectors. Potential insulation failure poses risks to power line maintenance teams and can lead to unplanned shutdowns, further compromising energy supply quality. This article explores an innovative pressure monitoring system for vacuum interrupters, utilizing fiber optic Bragg grids as a measuring sensor, enabling pressure measurement within the vacuum chamber ranging from 2 × 101 Pa to 5 × 105 Pa.

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Study on the Effect of Helium on the Dielectric Strength of Medium-Voltage Vacuum Interrupters

Cited by 4 publications

References 24 publications

Effect of selected parameters on the electrical strength of a high-voltage vacuum insulation system

Effect of selected parameters on the electrical strength of a high-voltage vacuum insulation system

Breakdown Initiation and Electrical Strength of a Vacuum Insulating System in the Environment of Selected Noble Gases at AC Voltage

Pressure Monitoring in Medium-Voltage Vacuum Interrupters

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