Research on Space Charge Characteristics of LDPE/Microcapsule Self-healing Insulation Material

In the field of electrical insulation, using microcapsules technology to prepare self-healing insulation materials is a new research field. This paper explores the preparation method of self-healing low density polyethylene (LDPE)/microcapsule insulation material, analyzes the influence of microcapsules with different concentrations on space charge characteristics of LDPE on the basis of the verification of self-healing characteristics. The results show that by doping microcapsules into the material, the goal of self-healing can be achieved and the space charge characteristics of the material can be improved, but it also results in slight disadvantages in other electrical characteristics, such as the accumulation of space charge, the increase in the decay rate of space charge. On the whole, when the concentration of microcapsules is 1wt%, the self-healing performance and space charge characteristics of composite materials are superior. The change of characteristics is mainly related to the characteristics of microcapsules themselves and the interfaces and charge traps they introduced. The microcapsules have influence on the polarization of the LDPE, thus affect the space charge characteristics of the insulation materials.