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首页> 外文会议>2013 IEEE International Conference on Solid Dielectrics >Nozzle ablation model: Calculation of nozzle ablation intensity and its influence on state of SF6 gas in thermal chamber
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Nozzle ablation model: Calculation of nozzle ablation intensity and its influence on state of SF6 gas in thermal chamber

机译：喷嘴烧蚀模型：喷嘴烧蚀强度的计算及其对热室中SF6气体状态的影响

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Energy released by electric arc during short circuit switching is mostly absorbed by the surrounding cold SF6 gas. However, a considerable part of this energy is also transferred and absorbed by other elements of the circuit breaker interrupter which are located near the electric arc. The most important parts are the transfer of energy to the arcing contacts and to the nozzles, absorption of the energy by these elements and the resulting effects. The absorption of the energy causes heating, melting and finally the vaporization of structural material and it is the main cause of wearing of arcing contacts and nozzles, where the latter is commonly referred to as the nozzle ablation. The nozzle ablation causes an increase in the nozzle throat diameter which generally has a negative effect on the circuit breakers breaking performance. The other significant effect is the mixing of SF6 gas and the nozzle vaporized material in the nozzle space and in the surrounding chambers. It is obvious that the ablation process has a considerable influence on the state of SF6 gas in the contact gap but also in the adjacent interrupting chambers, in particular on the state of gas in the thermal chamber in case of self-blast interrupting units. In this paper, a method of calculation of intensity of nozzle ablation is presented as well as a variety of calculation results. The calculated nozzle ablation intensity is verified by comparing the calculated results of the nozzle diameter increase and mass losses, with experimentally obtained data. In addition to the nozzle ablation intensity, the influence of the ablated nozzle material on the state of SF6 gas in the thermal chamber is also analyzed and discussed. The model is incorporated into a computer application for high voltage circuit breaker interruption simulation.
机译：短路切换期间电弧释放的能量主要被周围的冷SF 6 气体吸收。但是，该能量的很大一部分也被断路器灭弧室中位于电弧附近的其他元件传递和吸收。最重要的部分是能量到电弧触点和喷嘴的传递，这些元素对能量的吸收以及所产生的影响。能量的吸收会导致结构材料的加热，熔化并最终汽化，这是导致电弧触头和喷嘴磨损的主要原因，后者通常称为喷嘴烧蚀。喷嘴烧蚀导致喷嘴喉部直径的增大，这通常对断路器的断开性能具有负面影响。另一个重要的影响是在喷嘴空间和周围腔室中混合了SF 6 气体和喷嘴汽化材料。显然，烧蚀过程对接触间隙中的SF 6 气体的状态以及相邻中断腔室中的气体状态都有相当大的影响，特别是在热室中的情况下自爆中断单元。本文提出了一种计算喷嘴烧蚀强度的方法以及各种计算结果。通过将喷嘴直径增加和质量损失的计算结果与实验获得的数据进行比较，可以验证计算出的喷嘴消融强度。除了喷嘴烧蚀强度外，还分析和讨论了烧蚀喷嘴材料对热室中SF 6 气体状态的影响。该模型被并入用于高压断路器中断仿真的计算机应用程序中。

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