油柱直径对变压器油燃爆特性影响实验研究

Experimental study on the effect of oil column diameter to transformer oil flammability and explosion characteristics

特高压换流变压器管件内的变压器油易蒸发并形成可燃的油气混合物,当点火源存在时,变压器油燃爆会造成电力设备严重破坏。目前,有关变压器油爆炸动力学演化规律的实验研究匮乏,采用压力传感器测压和高速相机记录火焰形状,研究了油柱直径对变压器油爆炸超压演化和火球行为的影响。实验结果表明,随着油柱直径从93 mm增加至350 mm,最大超压和反射超压均呈现先增大后减小的趋势。随着压力测点与爆炸中心之间的距离增大,最大超压呈现逐渐下降的趋势。当油柱直径从153 mm变化至350 mm时,炸药爆炸诱导的变压器油火球行为相似,爆炸火球的传播以竖直向上扩展为主。变压器油爆燃火球的最大高度和最大面积随着油柱直径增加呈现先增大后减小的变化趋势。

The transformer oil in pipe fittings of the ultra-high voltage converter transformer is easy to evaporate and form the flammable oil gas mixture.Nowadays,the experimental study on the dynamic evolution of transformer oil flammability and explosion was scarce.The pressure sensors are used to measure overpressure and high-speed cameras were used to record fireball evolutions.The effects of oil column diameter on the overpressure evolution and fireball behavior of transformer oil explosions were studied.The experimental results show that with the increase of oil column diameter from 93 mm to 350 mm,the maximum overpressure and the reflected overpressure both increase first and then decrease.With the increase of the distance between the pressure measuring point and the explosion center,the maximum overpressure presents a gradual downward trend.When the diameter of oil column changes from 153 mm to 350 mm,the fireball behavior for the transformer oil induced by explosive explosion is similar,and the explosion fireball mainly propagates in the vertical direction.The maximum height and the maximum area of fireball induced by oil column explosion first increase and then decrease with the increase of oil column diameter.