等离子体射流处理对聚全氟乙丙烯薄膜沿面绝缘特性的影响研究

Effect of Deposited Film on the Surface Insulation Characteristics of FEP material by Atmospheric Pressure Plasma Jet

闪络现象严重制约电气设备的设计制造和安全稳定运行,而绝缘材料的表面状态及特性对闪络有着重要影响。为探索聚合物材料表面带电特性对真空闪络的影响规律,利用大气压等离子体射流对聚全氟乙丙烯薄膜进行表面处理,研究不同处理条件对材料表面绝缘特性的影响规律。对处理前后材料的表面化学组成、表面陷阱能级分布及空间电荷分布进行测量和分析。结果表明:表面处理在材料表面引入了含Si的无机基团,并使材料表面陷阱能级轻微变浅,材料表面陷阱密度明显增加,且陷阱密度增加趋势与空间电荷分布呈现出一定的正相关性。开展了处理前后薄膜材料的真空沿面闪络实验,实验结果表明:材料的真空沿面耐压随陷阱密度的增加出现先增加后降低的现象。研究结果表明,大气压等离子体表面处理能够在一定范围内调控材料表面陷阱参数,适当增加材料表面陷阱密度,有助于提高材料真空沿面耐压。

Flashover phenomenon restricts the design,manufacture and stable operation of electrical equipment seriously. The surface state and characteristics of insulating materials have an important effect on flashover. In order to explore the influence of surface charging characteristics on the flashover of polymer materials, atmospheric pressure plasma jets were used to treat the FEP film, and then the effect of different processing conditions on the insulation properties of material surface was studied. The surface chemical composition, trap level distribution, space charge distribution and flashover voltage in vacuum of the materials were tested and analyzed before and after the treatment. The results show that some inorganic groups containing silicon element were introduced on the surface of FEP, and the trap density increased in different degrees while the energy level of trap changed slightly. Moreover, the space charge distribution showed a certain positive correlation with the trap density. The flashover voltage of the FEP materials increased first and then decreased with the increase of the trap density. The research results show that atmospheric pressure plasma surface treatment can regulate the surface trapping parameters of the insulating materials within a certain range, which could withstandhigher voltage by increasing the surface trap density properly.