无机纳米填充对聚酰亚胺高频脉冲下局放特性的影响研究

聚酰亚胺薄膜作为特种工程塑料薄膜之一,目前被广泛应用于变频调速牵引电机对地绝缘和匝间绝缘中,是变频电机的基础绝缘材料。笔者在高频脉冲方波条件下,对纳米和非纳米聚酰亚胺薄膜进行了不同频率和不同上升时间下的局部放电测试,比较分析了其特征参量的变化情况。结果表明:气隙表面电导率对局部放电有很大影响,上升时间对PD参数的影响主要取决于初始电子的延迟和气隙的动态电场ΔE,无机纳米填料在聚合物中产生大量界面改善了材料的电导率,电荷沿着气隙表面运动更加容易,同时纳米材料中大量浅陷阱的存在,使局部放电初始电子的产生更加容易。

Influence of Inorganic Nano-filler No Partial Discharge of Polyimide Film under High-frequency Impulse

Polyimide film is applied widely in turn to turn insulation and turn to ground insulation of inverter-fed traction motors.In this paper,measurement of partial discharge is performed on nanometer hybrid polyimide film and non nanometer polyimide film under high-frequency square impulse with different frequency and different rise time.Some parameters of PD are discussed based on the measurement resuhs.The results show that the gap surface conductivity has a great impact on PD,the impact of rise time on PD parameters mainly depends on the initial electron delay and the dynamic electric field in the gap,the large number of interfaces formed by inorganic nano-filler improve the conductivity of the material to facilitate the movement of charge along the gap surface,and PD initial electrons generate more easily due to the existence of sufficient shallow traps in the nano-materials.