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In SF6 puffer-assisted self-blast interrupters, which are being developed as the next-generation switching mechanism, the arc burns within insulating nozzles with an ablation of the nozzle material and leads to an incoming gas flow for the pressure chamber with a pressure-rise during the high-current phase. Close to current zero, the arc can be cooled down and quenched completely by the reverse gas...
In a SF6 self-blast interrupter with the magnetic-field-producing coil, electrical arcs make hot gas flows driven into the expansion chamber for generating the blowing-off force during the high-current phase. When the fault current approaches natural current zero, this force can be used for cooling down and quenching the residual arcs. And the interaction of electrical arc-gas flow is critical to...
Free-burning arcs where the work piece acts as an anode are frequently used for a number of industrial applications. Our investigation was concerned with developing a capability to model free-burning high-intensity argon arcs and enhancing the accuracy of numerical results according to a comparative study of turbulence models. For the arc modeling involved complicated interactions between the flow...
In this study, we calculated the whole arcing history of SF 6 thermal plasmas happened inside a puffer-assisted self-blast chamber during the alternative current interruption process with two different turbulence models. It is very difficult to correctly realize all phenomena happened inside the interrupter using the computational schemes; therefore, we have been trying to simplify the physics...
For measuring the current–voltage (I–V) characteristic curve with respect to flowing plasmas, a Langmuir probe, a conducting object, should be inserted to the region directly, and the interaction between the probe and the flowing plasma is not avoidable. This interaction can cause the serious problem for plasma diagnostics due to aerodynamic and thermal disturbances generated by inserting the metallic...
The present work is a computational investigation of thermal plasmas in SF 6 switchgear, which burns in a mixture of working gas and PTFE and metal vapors resulting from nozzle ablation and electrode erosion, respectively. In order to solve the concentration of PTFE and electrode vapors conservation equations for the PTFE vapor and the metal vapor are solved together with the governing equations...
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