Abstract: In order to study the change law of the spray intensity of the transformer water mist system under different external wind speeds, a 110 kV transformer physical experiment platform was built. Using the water mist nozzles with two flow coefficients, five cold spray experiments of water mist under different wind speeds were designed. The influence of different wind speeds on the spray intensity of the transformer water mist system was analyzed. The results show that when the applied wind speed exceeds 4 m/s, the effect of water mist is obviously affected, and the spray intensity on the transformer starts to decrease. In addition, with the increase of the applied wind speed, the spray intensity showed a decreasing trend. In addition, under the same external wind speed, nozzle with a flow coefficient of K=2.0 has a better spray effect than that with a flow coefficient of K=1.7 under the same working pressure and wind speed, and its "resistance" to external wind speed is stronger than the nozzle with a flow coefficient of K=1.7 under its own advantage of larger flow.

Key words: external wind speed, transformer, water mist system, spray intensity