特高压换流变压器泡沫喷雾灭火系统失效分析

模拟不同数量喷头掉落下的冷喷试验，考察泡沫喷雾灭火系统受爆炸冲击、高温炙烤等特殊因素的影响，对特高压换流变压器泡沫喷雾灭火系统进行失效分析。结果表明，喷头工作压力、有效喷雾量和覆盖范围受掉落喷头占比影响显著，当掉落喷头占比超过20%时，喷头工作压力和有效喷雾量均低于标准要求，喷雾射程下降，喷雾范围缩小，无法形成全覆盖；喷头掉落后喷射的水柱有引发火灾扩大的风险；通过提高供液流量进行增强的方案仍会形成灭火盲区，满足不了灭火需求。

Failure analysis of foam spray fire extinguishing system of UHVDC converter transformer

 By simulating the cold spray test with different number of nozzles falling off, the influence of explosion, high- temperature and other special factors on the foam spray fire extinguishing system of UHVDC converter transformer was investigated, and the failure analysis of the foam spray fire extinguishing system was also carried out. The results showed that the working pressure, effective spray amount and coverage area of the spray nozzles were significantly affected by the proportion of falling nozzles. When the proportion of falling nozzles was more than 20% , the working pressure and effective spray amounts of nozzles were lower than the standard requirements. Meanwhile, the spraying range dropped and the spraying area shrank, thus the full coverage cannot be formed. There was even a risk of an extended fire caused by a jet of water after the nozzles falling off. In this case, the scheme of enhancing the liquid supply flow of the system was easy to form a blind area for fire extinguishing, which cannot meet the fire extinguishing requirements.