氟化无纺聚丙烯驻极体滤膜用于变压器油净化的过滤性能

变压器油的绝缘性能是影响电力设备安全运行的关键因素。采用氟化和直流电晕充电处理聚丙烯无纺布，并将其用于变压器油的净化，考察其过滤性能。结果表明：在氟化过程中，聚丙烯的部分C-H键被C-F键取代，同时聚丙烯纤维的平均直径减小，粗糙度增加，制备得到了超疏水滤膜。将氟化后的滤膜进行电晕充电并用于变压器油的净化发现，过滤后的油样相对于用原始滤膜过滤后的油样绝缘性能得到更多恢复，击穿电压升高，微水含量、相对介电常数和介质损耗因数降低。

Transformer-oil filtration properties of fluorinated nonwoven polypropylene electret films

The insulation property of transformer oil is a critical factor affecting the safe operation of power equipment. The nonwoven polypropylene (PP) electret films used for purification of transformer oil were treated by fluorination and DC corona charging, and the oil filtration properties were investigated. The results show that the C-H bonds in polypropylene can be replaced by C-F bonds during fluorination process and the mean diameter of fibers decreases while the roughness of the fibers increases, which represents the super-hydrophobicity. When the fluorinated PP films were corona charged and applied to transformer oil filtration, it was observed that the aged oil filtered by the modified films got a better recovery of insulation properties in comparison to that of oil filtered by original PP films. There was a great increase in the breakdown voltage. Furthermore, the content of moisture, the relative dielectric permittivity and loss factor decreased significantly.