主管:中华人民共和国应急管理部
主办:应急管理部天津消防研究所
ISSN 1009-0029  CN 12-1311/TU

Fire Science and Technology ›› 2021, Vol. 40 ›› Issue (4): 523-526.

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

CHEN Tao1, HU Cheng1, KAN Meng-han2, BU Xiao-lan2, YANG Xiao-guang3, MA Chong3, WANG Yu-wei1, BAO Zhi-ming1   

  1. 1.Tianjin Fire Science and Technology Research Institute of MEM,Tianjin 300381,China; 2. China Certification Center for Fire Products of MEM, Beijing 100077, China; 3. State Grid Economic and Technology Research Institute Co., Ltd., Beijing 102209, China
  • Online:2021-04-15 Published:2021-04-15

Abstract:  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. 

Key words:  , UHVDC converter transformer, fire extinguishing system, foam spray, failure analysis