To develop an alternative test method of internal arcing for replacing sulfur hexafluoride (SF₆) by air in SF₆-insulated power equipment, it is important for the public safety to clarify the thermal effect of hot SF₆ and air from the equipment on the surroundings. In this study, an analytical model for evaluating the incident heat energy on a metal plate by exhausted hot gas was developed and validated. SF₆-air mixtures with a range of gas thermodynamic and transport properties up to 30,000 K were modelled using computational fluid dynamics (CFD) to simulate the increase in pressure. The analytical results are investigated using the experimental results on SF₆-air mixtures. Subsequently, a method of setting the test conditions for the internal arc testing in SF₆-insulated power equipment, is proposed based on the analytical model. Using the mixture model, assuming an alternative arcing test for replacing SF₆ by air in the SF₆-insulated power equipment, the method of setting a current or the duration of current is demonstrated and verified. The results indicate that the current and duration of current can be set such that the incident heat energy on the metal plate by exhausted hot gas are approximately equalized. This study could establish an alternative test method of internal arc in SF₆-insulated power equipment.

为了开发一种用于在 SF ₆绝缘电力设备中用空气代替六氟化硫 (SF ₆ )的内部电弧替代测试方法，澄清热 SF ₆和来自设备的空气对公共安全的热影响对于公共安全很重要。周围环境。在这项研究中，开发并验证了一种分析模型，用于评估排出的热气对金属板的入射热能。使用计算流体动力学 (CFD) 模拟具有高达 30,000 K 的一系列气体热力学和传输特性的SF ₆空气混合物以模拟压力增加。使用SF ₆的实验结果研究分析结果-空气混合物。随后，基于解析模型提出了SF ₆绝缘电力设备内部电弧测试的测试条件设置方法。使用混合模型，假设在SF ₆绝缘电力设备中用空气代替SF ₆的替代电弧测试，演示和验证设置电流或电流持续时间的方法。结果表明，可以设置电流和电流持续时间，使得排出的热气体在金属板上的入射热能近似相等。本研究可为SF ₆绝缘电力设备中的内部电弧建立一种替代测试方法。