自由导电微粒受迫运动过程与振动特性

Forced Movement Process and Vibration Characteristics of Free Conductive Particle

针对气体绝缘金属封闭输电线路(GIL)中导电微粒(下称微粒)抑制与缺陷检测问题,参考GIL耐压试验程序,研究了交流电场中微粒的受迫运动过程与振动特性。通过试验获得微粒在工频电场中的运动过程,建立模型分析微粒的受迫振动特性,得到交流电场激励对微粒振动的影响规律。影响微粒振动规律的因素包括电压幅值、电压频率及电压初相角。工频条件下微粒未发生贯穿性运动时,碰撞频率随电场增加而减小,同时随机性增强,发生贯穿性运动时,碰撞频率随电场强度增加而增大;启举电场时,微粒碰撞频率随电源频率的增加而减小,碰撞随机性增加;初相角对微粒跳起幅值及碰撞频率影响较小,初相角为0°~180°与180°~360°时,微粒碰撞频率具有一定的对称性。

In order to solve the inhibition and detection problem of conductive particles(hereinafter referred to as particles)in gas insulated metal-enclosed transmission lines(GIL),the motion process of forced particle and its vibration characteristics in AC electric field were studied with reference to the withstand voltage test procedure.Particle movement process in power frequency electric field was obtained through experiment,and then a particle moving model was established to analyze the particle forced vibration characteristic,and the influence regulation of AC electric field excitation on particle vibration was analyzed.Factors affecting particle vibration characteristics include voltage amplitude,voltage frequency,and initial phase angle.When the particle moves without through the gap,its collision frequency decreases with the increase of electric field,and collision randomness increases.When the particle moves through the gap,its collision frequency increases with increasing electric field.The particle collision frequency decreases with the increase of power frequency under the lift-off electric field,and the collision randomness also increases.The initial phase angle has less influence on the particle jump amplitude,and particle collision frequency has a certain symmetry when the initial angle is 0°~180°and 180°~360°.