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

Lech Michał, Węgierek Paweł

Archives of Electrical Engineering

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2023

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Vol. 72, nr 3

597--611

EN

The article presents the results of laboratory measurements of 𝑈𝑑 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 W70Cu30 and Cu75Cr25 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 𝑈d 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 × 100 Pa for helium, respectively.

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Effect of nanowires and nanoparticles of copper on the structure and properties of the nanocomposite polymeric materials

Dobrzański L. A., Czaja I.

Archives of Materials Science and Engineering

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2015

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Vol. 75, nr 1

18--29

EN

Purpose: The main aim of this paper is to investigate the impact of nano-reinforcements in the form of Cu nanowires and Cu nanopowder on the structure and properties of polymeric composite materials Design/methodology/approach: Developed in this paper of nanocomposite materials reinforced with Cu nanopowders and Cu nanowires they have shown the ability to carry an electrical charge, which was confirmed by testing resistivity and resistance to electrical breakdown Findings: Research surface area of reinforce the material showed that the copperdimensional nanowires an attractive material for the strengthening of polymeric composite materials. Because of their shape and dimensions, the formation of percolation paths necessary for electrical charge in the insulating matrix, are a better material reinforcement of copper nanopowder Research limitations/implications: The phenomenon of current conduction through the polymer composite materials is an important property due to the use of these materials Originality/value: The paper presents the effect of the addition of one-dimensional nanowires of copper into the insulating matrix epoxy resin allowing electrical conductivity produced in this way, polymeric materials nanocomposites

3

Przebicie elektryczne izolacyjnej warstwy tlenku aluminium elektrycznych podzespołów pojazdów

Bąk Ł.

Zeszyty Naukowe. Transport / Politechnika Śląska

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2012

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z. 77

5--12

PL

W artykule przedstawiono podstawowe zastosowania elektrolitycznych warstw tlenkowych jako izolatora uzwojeń elektromagnesów i transformatorów oraz uzwojeń elektrycznych siłowników służących do sterowania zaworów silników spalinowych pojazdów samochodowych. Opisano wyniki badań mechanizmu przebicia elektrycznego anodowych powłok tlenkowych wytworzonych na taśmach aluminiowych (Al99,5), przeznaczonych na uzwojenia elektrycznych urządzeń sterujących w pojazdach. W artykule opisano wyniki badań zjawisk zachodzących w powłoce tlenkowej oraz w warstwie powierzchniowej utlenionej taśmy aluminiowej (Al99,5), w miejscu przebicia elektrycznego. Do przebicia elektrycznego wykorzystano elektrodę stożkową, pozwalającą ściśle określić miejsce zniszczenia powłoki wskutek przepływu prądu elektrycznego. Podczas badań wykonano pomiary i rejestrację krzywych przebiegu napięcia i prądu przebicia w celu określenia energii zużytej na uszkodzenie warstwy tlenkowej. Ilość energii elektrycznej zużytej podczas przebicia jest wystarczająca do stopienia zarówno warstwy tlenkowej, jak i mikroobjętości aluminium pod warstwą.

EN

The thesis presents the basic applications of electrolytic oxide layers as insulator of electric winding of electromagnet and transformers and electric winding of cylinders used for steering the valve of combustion engines. The results of research describe the mechanism of avalanche breakdown of oxide layers anode produced on aluminum strip (Al99,5), designed for electric winding which steer the vehicle equipment and valve of combustion engines. The phenomena occurring in the oxide layer and surface layer of oxidized aluminum strip (Al99,5) where the avalanche breakdown occurred are described. Conical electrode was used to define precisely the place of layer destruction due to electric current flow. During the research measurements and registration of voltage and current curve were made to define the energy used to destroy the oxide layer. The amount of energy used during the avalanche breakdown is enough to melt both the oxide layer and micro volume of aluminum under the layer.