The LTE simulation on decaying arc plasmas in various arc quenching gases in a model circuit breaker

Murai, Kosuke; Nakano, Tomoyukl; Tanaka, Yasunori; Uesugi, Yoshihiko; Ishijima, Tatsuo; Shiraishi, T.; Shimizu, Tetsuji; Tornita, Kentaro; Suzuki, Koji; Fujino, Takayasu

doi:10.1109/icepe-st.2015.7368392

Cited by 4 publications

(3 citation statements)

References 9 publications

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“…To check the validity the test conditions should be identical to the calculations. The test results for comparison were obtained from Murai et al's work [30], and the detailed test conditions were introduced in [17]. In this paper, the test conditions will be briefly introduced and discussed.…”

Section: Comparison With the Experimental Results In Literaturementioning

confidence: 99%

“…For Cu-W electrodes, the voltage drop near the electrode is around 17 V [31]. Hence the total calculated arc voltage should be 135 V, while the experimental result under the same condition is 142 V [30].…”

Section: Comparison On the Arc Behavior During The Arc Burningthe Arc...mentioning

confidence: 96%

“…During the arc decay phase, in this work the arc plasma was also assumed to be under the free recovery condition. Murai et al [30] measured the electron density after CZ in the CO 2 nozzle arc, and the test condition was exactly the same with the calculation model in this work as follows:…”

Section: Comparison Of the Arc Behavior During The Arc Decay-mentioning

confidence: 99%

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Numerical modeling of CO₂ arc based on the non-chemically equilibrium effect

Sun¹,

Zhang²,

Wu³

et al. 2022

J. Phys. D: Appl. Phys.

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Carbon dioxide (CO2) and its mixtures are potential alternative gases for arc extinguishing in switchgear. During the arc decaying phase, the non-chemically equilibrium (non-CE) effect leads to the departure from the local thermal equilibrium (LTE) model in predicting the arc behavior. This work is focused on the dynamic behavior of CO2 arc during the current zero (CZ) period. A non-CE numerical model was established. The decay process of temperature, energy and electrical conductivity between the LTE and non-CE models were compared. The distributions of species compositions, non-equilibrium parameters together with the transport process of the particles were further investigated. The change of particle distributions caused by the non-CE effect is the main reason for the difference of temperature decay between non-CE and LTE. The particles transport at the edge of the arc depends on the radial convection and diffusion, while the transport of atoms in the arc core is the combined results of convection, diffusion and chemical kinetics. As a contrast, the transport of electrons and ions is still dominated by chemical reactions. The decay of electron density at the nozzle throat calculated by the non-CE model are in good agreement with the laser Thomson scattering (LTS) tests, while the LTE model failed to predict the electron density accurately, which proves that the non-CE effect of CO2 arc during CZ period cannot be ignored.

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Section: Comparison With the Experimental Results In Literaturementioning

confidence: 99%

Section: Comparison On the Arc Behavior During The Arc Burningthe Arc...mentioning

confidence: 96%

See 1 more Smart Citation

Numerical modeling of CO₂ arc based on the non-chemically equilibrium effect

Sun¹,

Zhang²,

Wu³

et al. 2022

J. Phys. D: Appl. Phys.

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Investigation of laser-induced plasma in SF6 at different pressures using Thomson scattering

et al. 2020

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Thomson scattering was applied to measure the electron density and temperature in laser-induced SF6 plasmas at various pressures (0.2–2 atm). The plasma was induced by the Nd:YAG laser (1064 nm, 200 mJ, and 7 ns) focused into a chamber filled with SF6. A second harmonic Nd:YAG laser (532 nm, 50 mJ, and 6 ns) was used to probe the distributions of electron density and temperature. The images after breakdown indicate that higher pressure accelerates the plasma evolution and enhances the asymmetry of the plasma structure. Additionally, different from toroidal structures in other gases, a special vortex structure appeared in SF6. The electron density around the axis at 0.2 atm decreases from 1.66×1023 m−3 at 2 μs to 4.50×1022 m−3 at 6 μs, and meanwhile, the electron temperature drops from 22 050 K to 15 600 K. At 2 atm, from 2 μs to 6 μs, the electron density decreases from 3.00×1023 m−3 to 5.23×1022 m−3 and the temperature drops from 44 000 K to 14 800 K. The time exponent obtained by fitting the maximum electron density using the power law decreases from −1.206 to −1.669 in the pressure range from 0.2 atm to 2 atm, indicating that the pressure increases the decaying rate of electron density. From 0.4 atm to 2 atm, the time exponent of the decay of electron temperature decreases from −0.499 to −0.926. The comparisons among laser-induced plasmas in various gases show that the decaying rates of both electron density and temperature in SF6 are superior to air and argon.

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