基于CFD的SF₆气体绝缘设备泄漏模拟及防护措施

Leakage Simulation of SF₆ Gas Insulating Equipment Based on CFD and Protective Measure

摘要: 由于地下变电站的密闭性，变电站内的电气设备中的SF₆气体一旦发生泄漏，易造成电力设备的运行故障，并导致抢修人员窒息。通过对某地下变电站主变室内气体泄漏过程进行合理假设和简化分析，以三维湍流模型为基础，采用FLUENT软件对室内SF₆气体泄漏扩散进行数值模拟，并根据模拟结果结合行业法规选择合适的防护设备。结果表明，主变室内发生气体泄漏，在报警5分钟内地面及泄漏口附近浓度较高，通过穿戴正压供气式面罩及气体致密型化学防护服，可以有效保护检修人员的生命安全。该研究结果可为设备正常运行及维护检修人员的生命安全提供参考。

Abstract: Due to the leakproofness of underground substation, once the SF₆ gas in the electrical equipment of the underground substation leaks, the electrical equipment will cause operation troubles and workers will be suffocated. In view of this, reasonable assumption and simplified analysis were first made based on underground substation and the leakage process. Then, based on the k – ε turbulence modeling, the CFD software was adopted to simulate the diffusion of gas leakage in the room. According to the results of the simulation, this paper chooses the appropriate protective equipment combined with the industry regulations. The results show that gas leakage occurs in the main transformer room, near the ground and leakage of gas concentration is high in 5 minutes, and workers need to wear the mask of positive pressure air and the airtight protective clothing to ensure safety. This study will provide a reference to ensure the equipment work properly and repair personnel safety.