Analysis of Adverse Influence of Metal Vapor to Arc Movement Between Electrodes with External Magnetic Field Applied by Numerical Simulation

Electrical Engineering Japan

et al. 2022

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As the mileage of the electric railway increases, the unevenness of the contact wire may separate the contact wire and the contact strip. Simultaneously, a disconnection arc discharge is generated by the molten metal bridge. This causes the contact wire to melt and evaporate causing it to break. A few studies have conducted experiments to prevent the contact wire from disconnecting. Based on the results thus obtained, they presented their hypotheses considering conditions sch as the current and time required for melting and evaporation of molten metal bridge and arc generation. In this study, a calculation method for the melting and disconnection phenomenon of the contact wire. Its mass increased when the currents from both sides of the contact wire were taken into consideration. Therefore, we obtained that the convection and radiation play an improtant role for calculation of the melting amount mass of contact wire.

Section: Calculation Methodsmentioning

confidence: 99%

Section: Three-dimensional Electromagnetic Thermal Fluid Simulationmentioning

confidence: 99%

Development of calculation method for melting amount mass of contact wire caused by melting and evaporation of molten metal bridge and arc generation

Morishita

Maeda

Electrical Engineering Japan

et al. 2022

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“…The electrode opening velocity (EOV) was set as 10, 20, 25, 30, or 40 m/s, and the applied external magnetic field intensity (AEMFI) was set as 0, 1, 5, 7, or 9 mT. Details about basic assumptions, calculation area construction, governing equations, and calculation settings for mimicking the primary stage (which contains the generation of metal vapor from the molten metal bridge and the electrode opening process) of the interruption process can be referred from the authors' previous works [1][2][3].…”

Section: Calculation Methodsmentioning

confidence: 99%

Differentiation of Numerical Simulation Result of Direct Current Circuit Breaker Interruption Process Using Artificial Intelligence

IEEJ Transactions Elec Engng

Nemoto

Suzuki

et al. 2022

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For realizing the widespread application of fast charging of electric vehicles, a direct current circuit breaker (DCCB) is required to interrupt a large charging current. For developing a next-generation DCCB that can satisfy this requirement, a three-dimensional electromagnetic thermal fluid simulation was developed to mimic the interruption process of the DCCB, and an artificial intelligence (AI) model was constructed for differentiating the simulation result. As a result, successful and failed interruption of the DCCB were both simulated, and the constructed AI model successfully differentiated the interruption result and located the extinguish timing of arc plasma in case of a successful interruption.

“…A symmetrical three-dimensional calculation area based on the actual product was constructed for simplicity and rapid a Correspondence to: Toru Iwao. E-mail: tiwao@tcu.ac.jp *Electrical Engineering and Chemistry, Graduate School of Integrative Science and Engineering, Tokyo City University, 1-28-1 Tamazutsumi, Setagaya, Tokyo, 158-8557, Japan **Department of Electrical, Electronics and Communication Engineering, Faculty of Science and Engineering, Tokyo City University, 1-28-1 Tamazutsumi, Setagaya, Tokyo, 158-8557, Japan calculation, which the calculation area and boundary condition can be found in [1]. In this study, the local thermodynamic equilibrium, laminar flow, and uncompressed gas were assumed.…”

Section: Calculation Methodsmentioning

confidence: 99%

Numerical Simulation for Analyzing Re‐strike Phenomenon of Arc Plasma Considering Application of Recovery Voltage at Direct Current Circuit Breaker

IEEJ Transactions Elec Engng

Nemoto

Suzuki

et al. 2021

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To simulate the arc plasma movement and its physical properties during the interruption process of a direct current circuit breaker (DCCB), a numerical method was established in this study for applying recovery voltage during this interruption process considering the molten metal bridge, electrode opening process, and external magnetic field. The results reveal that the re-strike phenomenon was triggered by either the residue of high-temperature gas between the electrodes or the rebound flow velocity distribution at the periphery of arc plasma. Furthermore, suggestions for improving the DCCB design are provided herein.