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

Michał Lech Paweł Węgierek

Archives of Electrical Engineering | 2023 | vol. 72 | No 3 | 597-611 | DOI: 10.24425/aee.2023.146039

Keywords electrical breakdown electrical contacts electrical strength switchgear vacuum insulation

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Abstract

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 ₇₀Cu ₃₀ and Cu ₇₅Cr ₂₅ material was compared for selected values of contact gaps. It was found that below a pressure of p = 3.0 x 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 x 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 x 10 ^-1 Pa for argon, 4.1 x 10 ^-1 Pa for air, 6.4 x 10 ^-1 Pa for neon, and 2.55 x 10 ⁰ Pa for helium, respectively.

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Authors and Affiliations

Michał Lech

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Paweł Węgierek

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Faculty of Electrical Engineering and Computer Science, Lublin University of Technology, Nadbystrzycka 38A str., 20-618 Lublin, Poland

Fabrication of a Novel Silver-Based Electrical Contact Composites and Assessment of Its Mechanical and Electrical Properties

S. Praveen Kumar S.M. Senthil R. Parameshwaran R. Rathanasamy

Archives of Metallurgy and Materials | 2021 | vol. 66 | No 4 | 1087-1094 | DOI: 10.24425/amm.2021.136428

Keywords silver tin oxide electrical contact composites tungsten oxide conductivity

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Abstract

The electrical contactors play a crucial role in closing the circuit in many power distribution components like overhead lines, underground cables, circuit breakers, transformers, and control systems. The failure in these components mainly occurs due to the break-down of contactors due to the continuous opening and closing action of contacts. Silver (Ag)-based oxide contact materials are widely used in practice, among which silver tin oxide (AgSnO2) is most common. An attempt is made in increasing the performance of AgSnO2, by adding Tungsten Oxide (WO3) in various weight proportions, thus finding the optimal proportion of AgSnO2WO3 to have increased mechanical and electrical performances. All the composite samples are fabricated in-house using powder metallurgy process. The assessment of physical and electrical properties namely, density, hardness, porosity, and electrical conductivity, showed that 90%Ag-8.5%SnO2-1.5%WO3 composite yielded superior results. With help of morphological tests, wear characteristics are also investigated, which showed that 90%Ag-8.5%SnO2-1.5%WO3 composite has a wear coefficient of 0.000227 and a coefficient of friction of 0.174 at an optimized load of 10 N and sliding velocity of 0.5 mm/s.

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Authors and Affiliations

S. Praveen Kumar

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S.M. Senthil

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ORCID:

R. Parameshwaran

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ORCID:

R. Rathanasamy

e-mail:

ORCID:

Kongu Engineering College, Erode, Tamilnadu, India

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

Abstract

Authors and Affiliations

Fabrication of a Novel Silver-Based Electrical Contact Composites and Assessment of Its Mechanical and Electrical Properties

Abstract

Bibliography

Authors and Affiliations