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首页> 外文期刊>Journal of Physics, D. Applied Physics: A Europhysics Journal >Modelling of the deformation of PTFE-nozzles in a high voltage circuit breaker due to multiple interruptions
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Modelling of the deformation of PTFE-nozzles in a high voltage circuit breaker due to multiple interruptions

机译：由于多次中断而导致高压断路器中PTFE喷嘴变形的建模

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This paper deals with the utilization of an improved model for the PTFE-nozzle deformation caused by the ablation process in the simulation of on-load switching-off processes in high-voltage circuit breakers. In order to describe the plasma's behaviour, a transient axisymmetric model is used, which is based on the @ Fluent software. The presented arc model uses mixed formulations for the calculation of the self-induced magnetic field and the radiative heat transfer. The proposed ablation model is based on PTFE evaporation including the nozzle wall deformation. The newly developed approach is used to simulate test series taking into account the accumulated PTFE wall degradation of previous interruptions. The simulation model is validated by the comparison of the simulation results with the measurements. We show the necessity of considering the accumulated nozzle wall degeneration and PTFE evaporation enthalpy in dependence on pressure to yield a good agreement between experiment and simulation.
机译：本文研究了一种改进模型，用于模拟高压断路器的有载断开过程中由烧蚀过程引起的PTFE喷嘴变形。为了描述等离子体的行为，使用了基于@ Fluent软件的瞬态轴对称模型。提出的电弧模型使用混合公式来计算自感应磁场和辐射热传递。所提出的烧蚀模型基于包括喷嘴壁变形在内的PTFE蒸发。考虑到先前中断的累积PTFE壁退化，新开发的方法用于模拟测试序列。通过将仿真结果与测量结果进行比较来验证仿真模型。我们表明有必要根据压力来考虑累积的喷嘴壁退化和PTFE蒸发焓，以在实验和仿真之间取得良好的一致性。

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