Electrical Tree Characteristics of Epoxy Resin/Aln Nanocomposites in LN2 With Repetitive Nanosecond Pulse Voltage

Under the action of nanosecond pulse voltage, the insulation material is prone to partial discharge, which induces the generation of electrical trees and insulation failure. The epoxy resin/aluminum nitride (AlN) nanocomposites are developed to suppress the development of electrical treeing for cryogenic insulation of high-temperature superconducting power equipment. The effects of the content of aluminum nitride material on the relative permittivity and dielectric loss of composites were studied, as well as the growth characteristics of electrical treeing at liquid nitrogen temperature. The findings reveal that the samples with the AlN content of 3 wt% have the highest relative permittivity, rising by 15%, but nanoparticle doping has no significant effect on the dielectric loss of composites. Furthermore, the right amount of AlN nanoparticle doping will improve the electrical treeing resistance of epoxy resin and the insulation properties of composites.