Abstract: To explore more effective way of oil-immersed transformer protection, an outdoor 220 kV oil-immersed transformer is used as the research object, and an oil-immersed transformer physical fire test platform is developed to analyze the different fire extinguishing effects of various fire extinguishing methods in the combustion test by conducting high pressure fine water mist, water spray and foam spray fire extinguishing tests as a single action and synergistic action. The effectiveness of multiple fire extinguishing methods in outdoor oil-immersed transformers was verified through physical fire combustion tests. The test results show that the high-pressure fine water mist fire extinguishing system has advantages over the water spray fire extinguishing system in terms of water consumption and smoke decontamination; and the synergistic fire extinguishing system has obvious effects on the fire extinguishing efficiency compared with the single fire extinguishing system.

Key words: 220 kV outdoor oil-immersed transformer, fire fighting system, full-scale experiment