When the high voltage breaker acts,the contacts can form an arc,and be accompanied by evaporation and splash phenomenon,which causes the material erosion and contact system invalid. In order to study the char-acteristics of the splash mechanism of the ablation failure of high voltage circuit breaker,the flow and heat transfer models of the arc bath were established. And the temperature,flow and pressure distribution of the contact in the different arc root were analyzed by using FLUENT. The results show that:Under the two arc root conditions,a semicircle molten pool is formed. And at the condition of small arc root,the energy is not conducive to the distri-bution of energy and arc movement,resulting in a larger flow rate,increasing the erosion of the electrode. The flow rate of the molten pool increases with the current,and the greater the current is,the faster the velocity of flu-id in the arc root zone rises from the minimum to the maximum,and the melting speed of the molten pool is also accelerated.%高压断路器动作时,触头间会形成电弧,并伴随蒸发和喷溅现象,造成触头材料侵蚀和接触系统的失效.为研究高压断路器烧蚀故障的喷溅机理特征,建立了弧触头熔池的流动与传热模型,并运用FLUENT软件分析了触头在不同弧根下的熔池温度场、流场和压力分布.计算结果表明:在两种弧根条件下,均形成了半圆形的熔池,弧根较小的情形下不利于能量的散发和电弧的运动,导致流速较大,增大电极的侵蚀.熔池的流体流速随电流的增大而增大,且电流越大,弧根区内流体流速由最小值上升到最大值的速度越快,熔池深度方向的熔化速度也加快.
展开▼
