以流体动力学为基础，建立了脉冲电压作用下含气泡的变压器油流注放电仿真模型。通过改变气泡的位置、大小及数量，研究了含气泡的变压器油的电场强度和空间电荷密度的变化规律。仿真结果表明，当击穿电压达到一定值时，由于气泡内部气体的积聚，气泡内部会形成电场梯度，从而产生内部放电现象。距离高压电极越近的气泡越先被击穿，放电进行的时间也相对更短；气泡的尺寸越大，变压器油流注放电的速度越缓慢；气泡的数量越多，流注放电时的电场越剧烈，放电持续时间越久，对变压器造成的伤害也越大。

Based on fluid dynamics, a simulation model of transformer oil containing bubbles streamer discharge under the action of impulse voltage is established. The variation laws of electric field intensity and space charge density of transformer oil containing bubbles are studied by changing the position, size and number of bubbles. The simulation results show that when the breakdown voltage reaches a certain value, an electric field gradient is formed inside the bubble due to the accumulation of gas inside the bubble, resulting in an internal discharge phenomenon. The closer the bubble is to the high-voltage electrode the faster it is broken down, and the discharge proceeds in a relatively shorter time. The larger the size of the bubble, the slower the transformer oil streamer discharge. And the more the number of bubbles , the more intense the electric field during the streamer discharge, the longer the discharge lasts, and the greater the damage caused to the transformer.

辽宁省自然科学基金（2020-MS-214）