Abstract: Oil immersed transformers are mostly arranged in outdoor environments, and environmental wind is a key factor affecting the development of open space transformer fires. This article conducted experiments on transformer oil pool fire under different wind speeds and analyzed the change rules in parameters such as pool fire combustion rate and flame inclination angle. The results showed that under the influence of environmental air flow, the stable burning rate of pool fire showed a non monotonic evolution law, and the stable burning rate showed a "rise, decrease, rise" trend with the increase of wind speed. Due to the positive correlation between buoyancy and the diameter of the oil pool, the flame inclination angle is inversely proportional to the diameter of the oil pool; As the wind speed increases, the flame tilt angle shows a trend of "rapid increase and slow increase". Four flame inclination models were compared and the most applicable transformer oil flame inclination model was obtained. The research results can provide theoretical support for transformer fire control.

Key words: transformer fire, environmental wind, pool fire, flame inclination angle, burning rate