Dielectric Response Characteristics of Fluorinert Liquid-Impregnated Paper Insulation

This paper introduce a new fluorinert liquid-paper composite insulating material with environment-friendly and high insulation. The dielectric properties of the fluorinert liquid-paper material are discussed. The fluorinert liquidimpregnated paper samples were prepared by vacuum impregnating the dried papers for 48h. Then, broadband dielectric spectrum measurements were carried out to study the dielectric response characteristics of the composite samples. The results indicated that the tested dielectric permittivity of the fluorinert liquid is low (1.8). The low frequency dielectric loss was described to the ion conduction. The fluorinert liquid-paper insulation indicated a relative higher permittivity than paper insulating material and a lower permittivity than fluorinert liquid. The dielectric response characteristics is determined by the conduction loss and diople or interface polarization loss, respectively. The fitting results by the H-N model considering the low frequency conduction behaviors is benefical to understand the dielectric response of the fluorinert liquid-paper insulation. This new type of liquid-solid insulation has potential application in power electronic transformer.