Analysis of the Electrophysical and Thermophysical Properties of Copper-Graphite Material for Arcing Contacts of a High-Current Low-Voltage Circuit Breaker

Derevyankin, Pavel G.; Kriskovets, Dmitriy S.; Frolov, Vladimir; Yushin, Boris A.

doi:10.1109/elconrus51938.2021.9396372

2021 IEEE Conference of Russian Young Researchers in Electrical and Electronic Engineering (ElConRus) 2021

DOI: 10.1109/elconrus51938.2021.9396372

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Analysis of the Electrophysical and Thermophysical Properties of Copper-Graphite Material for Arcing Contacts of a High-Current Low-Voltage Circuit Breaker

Pavel G. Derevyankin

Dmitriy S. Kriskovets

Vladimir Frolov

et al.

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Cited by 2 publications

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“…The presented calculation results correspond to the experimental data for the temperature and plasma flow rate parameters [2,35]. The data for calculating the rate of the powder supply for immersion in the plasma jet are confirmed visually by a laboratory test arranged similarly to Figure 1.…”

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confidence: 76%

“…The Prandtl number Pr = 0.54. A laboratory experiment aimed to identify the optimal modes of the technological process, consisting of coating deposition (Figure 12) by plasma spraying (described in detail in [35]) to metal substrates made of stainless steel, with equal dimensions and weights as fixed technological parameters (Table 4). Then, the mass gain of the plates was measured for each case and the values of the Reynolds number, productivity, and process efficiency were calculated [36,37].…”

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confidence: 99%

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The Influence of Electric Arc Plasma Turbulence on Heat Transfer Processes Involving Powder Materials

et al. 2023

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The paper presents an analysis of the heat transfer processes in electric arc plasma conditions between the powder material and the plasma jet in different convective states. The heat transfer processes in the plasma jet generated for coating deposition are considered based on varying the conditions for the jet–powder interaction. The formed coating deposited onto the substrate acts as an indicator of the heat transfer efficiency. The heat transfer between the plasma jet and the powder material is facilitated by the turbulent nature of the plasma jet. The presented calculation results demonstrate the influence of the plasma flow turbulence on the motion of the fine powder and heating of the generated jet at the outlet of the plasma torch. An analysis of the influence of plasma flow turbulence on the acceleration and heating of fine powder particles was carried out. The experimental results allowed for the determination of the effect of the plasma jet turbulence degree on the heat transfer processes between the plasma and fine powder: the technological efficiency of the device with varying parameters of the spraying process and the flow rates of the material supply and plasma-forming gas were presented. The values of the plasma-forming gas supply rate, the material supply rate, and the Reynolds number were obtained while the other process parameters were fixed. The research was carried out within the state assignment of the Ministry of Science and Higher Education of the Russian Federation (theme No. FSEG-2023-0012).

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The Influence of Electric Arc Plasma Turbulence on Heat Transfer Processes Involving Powder Materials

et al. 2023

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Switching Arc Energy Limitation Approach for LV Circuit Breakers

Smugala

Bonk

2021

Energies

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This paper presents an experimentally verified approach to deriving switching arc energy limitations for low-voltage (LV) circuit breakers (CBs). Air-insulated contactors equipped with additional vacuum-insulated (VI) arcing contacts were tested for AC and DC current interruption efficiency, respectively. In the study, the contact arrangements of reed relay VI contact switches of low current breaking capacity combined with air-insulated contactors were examined. Tests were performed on selected LV CBs inductively loaded for LV power network rated voltages. A comparative analysis of the arc energy resulting from various arc time durations recorded during the switching-off operation was performed. Using a variety of either basic CB air-insulated contact systems or combined contact systems, a practical assessment of the proposed idea for enhancing the arc quenching efficiency was undertaken. As a result of the implementation of the proposed idea, the arc burning duration time was indicated as being hundreds of times shorter. In most cases, a complete arc reduction was achieved. Moreover, the resulting arc energy dissipation during the breaking operation was substantially minimized. Consequently, a significant increase in the total current breaking capacity of the tested CBs was achieved.

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Analysis of the Electrophysical and Thermophysical Properties of Copper-Graphite Material for Arcing Contacts of a High-Current Low-Voltage Circuit Breaker

Cited by 2 publications

References 7 publications

The Influence of Electric Arc Plasma Turbulence on Heat Transfer Processes Involving Powder Materials

The Influence of Electric Arc Plasma Turbulence on Heat Transfer Processes Involving Powder Materials

Switching Arc Energy Limitation Approach for LV Circuit Breakers

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