Abstract: In order to build an effective UHV converter station transformer automatic fire protection system, a comprehensive analysis of the characteristics of this type of transformer fire is carried out, and based on the method of solid fire simulation experiments, the effectiveness of the high- pressure water mist system and the water mist turbofan gun system for fire extinguishing is emphasized. The experimental results show that both systems have efficient fire extinguishing performance, and the lateral sprinkler can effectively improve the fire extinguishing efficiency of the highpressure water mist system；The sequence of fire extinguishing actions of the turbofan gun system should be from top to bottom, and continuous cooling after spraying to prevent reignition .

Key words: converter station, high- pressure water mist system, turbofan gun water mist system