Fundamental Investigation Technique on Gas-blast Arc Behaviors in Decaying and Re-ignition Processes using Power Semiconductors

Tanaka, Yasunori; Nakano, T.; Shimizu, Tetsuji; Tomita, Kentaro; Fujino, Takayasu; Suzuki, Koji

doi:10.1541/ieejpes.135.661

Cited by 10 publications

(12 citation statements)

References 5 publications

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“…This measurement result can be compared with the numerical simulation result to study arc behavior including non-equilibrium effects. Figure 5 shows a photo and the cross section diagram of the nozzle used in our experiments [7]. The nozzle Figure 4.…”

Section: Experimental Approaches: Electron Density Measurement Withoumentioning

confidence: 99%

“…In addition, some recent experiments will be introduced for decaying arcs with a detailed control of applied voltage and injected current using some power semiconductors [7]. In the experiments, two measurement methods were adopted to determine the electron density without LTE assumption: the laser Thomson scattering method [8] and the Shack-Hartmann method [9].…”

Section: Introductionmentioning

confidence: 99%

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Non-equilibrium Studies in Switching Arc Plasmas in Japan

Tanaka

Tomita²,

Inada

et al. 2017

PPT

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Abstract. This paper briefly introduce research work examples of non-equilibrium studies in switching arcs. In understanding arc behavior, one often assumes local thermodynamic equilibrium (LTE) condition in the arc plasma. However, actual arc plasmas are not completely and not always in LTE state because of strong temperature change temporally and spatially, and high electric field application etc. Recently, we have a collaboration work in numerical simulations and experimental approaches for decaying arcs without LTE assumption. First, our numerical model is presented for decaying arcs without chemical equilibrium assumption. Secondly, two experimental methods are introduced for measuring electron density in decaying arcs without LTE assumption: Laser Thomson Scattering method and the Schack-Hartmann method. Finally, comparison results is shown between the LTE simulation, the chemically non-equilibrium simulation, and the above experimental measurements.

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Section: Experimental Approaches: Electron Density Measurement Withoumentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Non-equilibrium Studies in Switching Arc Plasmas in Japan

Tanaka

Tomita²,

Inada

et al. 2017

PPT

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“…To solve this problem, Matsumura et al proposed creating a free recovery state with an insulated gate bipolar transistor (IGBT) and applying pseudo-transient recovery voltage. 7,8 Moreover, Tomita et al attempted to elucidate the causes of re-ignition by measuring the electron number density using laser Thomson scattering. 9 However, after the current reaches zero, the residual hot gas from the arc discharge causes thermal re-ignition.…”

Section: Introductionmentioning

confidence: 99%

Arc Temperature Measurement with Microsecond Spectroscopic Measurement

et al. 2019

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The quality of electric power caused by frequency fluctuation and voltage rise will be degraded because of the lightning surge and the mass introduction of distributed power. Thus, it is necessary to improve the performance of gas circuit breaker in order to maintain the stable supply of electric power. It has been reported that the arc conductance is calculated as the index of the current interruption in numerical analysis. However, few report have the measured value in the current interruption. This is because that the current interruption is the steep phenomenon of micro seconds range. Thus, it is necessary to establish the time-high precision and noncontact measurement method. In this paper, the arc temperature is measured near current zero using the microsecond spectroscopic measurement. As a result, the microsecond spectroscopic measurement which combines the conventional spectroscope and the high speed video camera is 200 times faster than the measurement of conventional spectroscope. For this reason, the microsecond spectroscopic measurement is possible with the high speed video camera. Therefore, it is possible to measure the arc temperature with decreasing the current using the microsecond spectroscope. K E Y W O R D Sarc temperature, Boltzmann plot, GCB, microsecond spectroscopic measurement, spectrum

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“…For this reason, it is important to study the arc extinction phenomena in detail with both experimental and numerical simulation approaches . In our previous experimental approach, we established a new system of decaying arc plasmas using a direct‐current power source and an insulated gate bipolar transistor . This experimental system can accurately control the timings of supplied current and applied voltage to arc plasmas in a gas flow.…”

Section: Introductionmentioning

confidence: 99%

Numerical thermofluid simulation of a decaying arc behavior in CO₂/O₂/C₅F₁₀O (C5‐PFK) considering more than nona‐atomic molecules

Demura

Tanaka

Uesugi

et al. 2019

IEEJ Transactions Elec Engng

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The present article describes numerical thermofluid simulation results on decaying arc behavior in 80%CO 2 + 10%O 2 + 10%C 5 F 10 O (C5-PFK) gas considering molecules constituted with more than 9 atoms in a nozzle space on the assumption of local thermodynamic equilibrium (LTE) condition. The gas mixture 80%CO 2 + 10%O 2 + 10%C 5 F 10 O (C5-PFK) is one of the candidate alternatives for SF 6 in a gas circuit breaker. First, we calculated 80%CO 2 + 10%O 2 + 10%C 5 F 10 O (C5-PFK) arc characteristics only by considering less than 8-atom molecules. However, it seems possible to produce more than nona-atomic molecules in the low-temperature region in 80%CO 2 + 10%O 2 + 10%C 5 F 10 O (C5-PFK) arcs. The present work further calculated the equilibrium composition of this gas mixture at 0.1 MPa with taking account more than nona-atomic molecules. Furthermore, their thermodynamic and transport properties were also computed with collision integrals between species considered. Using these properties, the arc temperature and gas flow fields were calculated using two-dimensional LTE model for a free recovery condition from dc 50 to 0 A. Results showed that a similar temperature decay was obtained for arcs in the 80%CO 2 + 10%O 2 + 10%C 5 F 10 O (C5-PFK) gas mixture to that for arcs in 100%CO 2 gas.

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Fundamental Investigation Technique on Gas-blast Arc Behaviors in Decaying and Re-ignition Processes using Power Semiconductors

Cited by 10 publications

References 5 publications

Non-equilibrium Studies in Switching Arc Plasmas in Japan

Non-equilibrium Studies in Switching Arc Plasmas in Japan

Arc Temperature Measurement with Microsecond Spectroscopic Measurement

Numerical thermofluid simulation of a decaying arc behavior in CO₂/O₂/C₅F₁₀O (C5‐PFK) considering more than nona‐atomic molecules

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Fundamental Investigation Technique on Gas-blast Arc Behaviors in Decaying and Re-ignition Processes using Power Semiconductors

Cited by 10 publications

References 5 publications

Non-equilibrium Studies in Switching Arc Plasmas in Japan

Non-equilibrium Studies in Switching Arc Plasmas in Japan

Arc Temperature Measurement with Microsecond Spectroscopic Measurement

Numerical thermofluid simulation of a decaying arc behavior in CO2/O2/C5F10O (C5‐PFK) considering more than nona‐atomic molecules

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Numerical thermofluid simulation of a decaying arc behavior in CO₂/O₂/C₅F₁₀O (C5‐PFK) considering more than nona‐atomic molecules