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Effect of micron ZnO doping on the charge accumulation and dissipation characteristics of EPDM surface

High-voltage cable terminals have a complex insulation structure with uneven internal electric field distribution, resulting in local electric field distortion, and impurities such as scratches, conductive particles and frequent overvoltage operating conditions caused during the installation of cable terminals can aggravate the degradation of insulation materials and even lead to breakdown accidents of electrical equipment. To study the effect of micron ZnO ceramic particles on the surface charge accumulation and dissipation characteristics of EPDM materials, a platform for the preparation of ZnO/EPDM composites was built, and several sets of specimens were prepared by varying the amount of doped ZnO micron particles. The surface potential distribution of the composite material and the decay curve of the surface potential of the composite material were measured during charge dissipation. The results show that the surface potential of the composite specimen has a bell-shaped distribution and can maintain its shape during the dissipation process, and there are two dissipation modes of the composite surface charge: dissipation along the interior of the composite and dissipation along the surface of the composite; with the increase of filler concentration, the dissipation rate of the composite increases and the starting voltage amplitude decreases.