Improved Dielectric Performance of Silicone Rubber Filled with Graphene under Gradient Magnetic Field

In this paper, graphene nanoparticles are doped into silicone rubber (SiR) to research the electrical tree characteristics under a gradient magnetic field. The results indicate that SiR doped with graphene nanoparticles can improve its insulating performance under a magnetic field. The probability of electrical tree initiation in samples decreases with different nanoparticle contents. When the doping content is low, the growth process of the electrical tree is effectively inhibited. Moreover, after adding graphene nanoparticles, the breakdown time of the samples is also extended. The sample with a content of 0.003wt% has the best performance. However, when the doping content exceeds this value, the performance improvement effect is weakened. The growth of the electrical tree in SiR can be limited because the injected charge is captured by graphene nanoparticles.