Yuki Inada
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View article: Concept Proof of Voltage Suppression across <scp>IGBT</scp> Application for Fuse‐Current‐Limiting Hybrid <scp>DCCBs</scp>
Concept Proof of Voltage Suppression across <span>IGBT</span> Application for Fuse‐Current‐Limiting Hybrid <span>DCCBs</span> Open
DC power systems require reliable and cost‐effective DC circuit breakers (DCCBs). In a previous study, we introduced a hybrid DCCB featuring a current‐limiting fuse, insulated gate bipolar transistor (IGBT), and a varistor connected in par…
View article: Massive, long-time generation of OH(X) in ball lightning discharge
Massive, long-time generation of OH(X) in ball lightning discharge Open
Three-dimensional dynamics of an OH(X) density and gas temperature in a ball lightning discharge were measured by broadband UV absorption spectroscopy. The maximum radius of the OH(X) density distribution was 40 mm, and the absolute number…
View article: Fault and Load Current Interruption in Low-Voltage System Using Fuse-Semiconductor Current-Limiting Circuit Breaker
Fault and Load Current Interruption in Low-Voltage System Using Fuse-Semiconductor Current-Limiting Circuit Breaker Open
For the realization of carbon neutrality and an advanced information society, we have previously developed a novel current-limiting circuit breaker composed of a fuse, a power semiconductor and a fuse exchanger. However, its feasibility ha…
View article: Single-shot optical imaging with spectrum circuit bridging timescales in high-speed photography
Single-shot optical imaging with spectrum circuit bridging timescales in high-speed photography Open
Single-shot optical imaging based on ultrashort lasers has revealed nonrepetitive processes in subnanosecond timescales beyond the recording range of conventional high-speed cameras. However, nanosecond photography without sacrificing shor…
View article: Spectrum shuttle for producing spatially shapable GHz burst pulses
Spectrum shuttle for producing spatially shapable GHz burst pulses Open
Spatiotemporal shaping of ultrashort pulses is pivotal for various technologies, such as burst laser ablation and ultrafast imaging. However, the difficulty of pulse stretching to subnanosecond intervals and independent control of the spat…
View article: Internal State of Fuse Arc Differentiating Interruption Success and Failure in Fuse‐Semiconductor <scp>DC</scp> Circuit Breaker
Internal State of Fuse Arc Differentiating Interruption Success and Failure in Fuse‐Semiconductor <span>DC</span> Circuit Breaker Open
For the realization of sustainable society installing renewable energy sources, we have proposed a compact, low‐cost, versatile DC circuit breaker that combines a fuse and a power semiconductor. However, even under the same interruption co…
View article: Spatiotemporal evolution of electrical conductivity in current-limiting-fuse arc
Spatiotemporal evolution of electrical conductivity in current-limiting-fuse arc Open
To improve the interruption capacity of a current-limiting fuse, a detailed diagnosis of the spatial electrical conductivity distribution inside the fuse arc under the current limiting phase around current zero is required, because this di…
View article: Single-shot ultrafast dual-view imaging of shock waves in parallel laser processing
Single-shot ultrafast dual-view imaging of shock waves in parallel laser processing Open
Single-shot ultrafast optical imaging has revealed various non-repetitive processes, but it has conventionally provided only single-view measurements. Here, we demonstrate a single-shot ultrafast dual-view imaging technique by monitoring s…
View article: Dependence of electron and neutral vapor density distributions on anode mode of high current vacuum arc
Dependence of electron and neutral vapor density distributions on anode mode of high current vacuum arc Open
The vacuum arc discharge makes transition to a footpoint mode, anode spot type 1 (type 1) mode and anode spot type 2 (type 2) mode under high current conditions. The mode dependence of the electron and metal vapor densities were experiment…
View article: Measurement of Electron Density in a Pulsed Positive Streamer Discharge in Atmospheric-pressure Air
Measurement of Electron Density in a Pulsed Positive Streamer Discharge in Atmospheric-pressure Air Open
1.はじめに
View article: Recent Study on Interruption Phenomenon of High Current Arc
Recent Study on Interruption Phenomenon of High Current Arc Open
1．はじめに
View article: Validation of the local thermodynamic equilibrium at a local current concentration area of positive pulsed surface discharge plasma on water
Validation of the local thermodynamic equilibrium at a local current concentration area of positive pulsed surface discharge plasma on water Open
Pulsed surface discharge on water has been given attention as a water purification technology and material synthesis method. The contribution of this study is to clarify the plasma state of a positive pulsed surface discharge on water. Alt…
View article: Anomalous plasma temperature at supercritical phase of pressurized CO<inf>2</inf> after pulsed breakdown followed by large short-circuit current
Anomalous plasma temperature at supercritical phase of pressurized CO2 after pulsed breakdown followed by large short-circuit current Open
The relation between breakdown characteristics and plasma temperature of a pulsed arc discharge in highly pressurized CO2 was investigated up to a supercritical phase. A transient arc discharge was generated by applying nanosecond pulsed v…
View article: Comparative study on arc extinction process under air, CO2 and SF6 gas blasting using two-dimensional electron density imaging sensor
Comparative study on arc extinction process under air, CO2 and SF6 gas blasting using two-dimensional electron density imaging sensor Open
Shack–Hartmann type laser wavefront sensors were applied to gas-blasted arc discharges under current-zero phases generated in a 50-mm-long interelectrode gap confined by a gas flow nozzle, in order to conduct a systematic comparison of ele…
View article: Non-equilibrium Studies in Switching Arc Plasmas in Japan
Non-equilibrium Studies in Switching Arc Plasmas in Japan Open
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 plasm…