基于FLACS的特高压变压器蒸气云爆炸后果评估

针对特高压变压器火灾引发蒸气云爆炸的问题，结合某特高压变压器爆燃事故案例，利用FLACS 建立全尺寸特高压变压器模型，模拟变压器第一次蒸气云爆炸与蒸气云充分扩展后爆炸2 种工况，确定爆炸超压破坏范围。研究发现：第一次蒸气云爆炸最大压力为7.2 kPa，集中在油箱上部，主要破坏油箱上部结构；第二次蒸气云爆炸最大压力为26.7 kPa，集中在整个变压器周围，变压器整体被破坏。依据爆炸模拟结果提出了合理布置自动灭火系统等注意事项，可降低爆炸对自动灭火系统的破坏。

Consequence assessment of UHV transformer vapor cloud explosion based on FLACS

Against the problem of steam cloud explosion accident caused by UHV transformer fire, combined with an UHV transformer deflagration accident, a full-scale UHV transformer model was established using FLACS to simulate two working conditions: the first steam cloud explosion of the transformer and the explosion after the steam cloud fully expanded, and the explosion damage range was decided. It is found that the maximum pressure of the first steam cloud explosion is 7.2 kPa, which is concentrated on the upper part of the oil tank and mainly destroys the upper structure of the oil tank. For the second steam cloud explosion, the maximum pressure is 26.7 kPa, and the pressure is concentrated around the entire transformer, and the transformer is destroyed as a whole. According to the result of explosion simulation, the automatic fire extinguishing system can be reasonably arranged and the damage to the automatic fire extinguishing system can be reduced.