Abstract
Minor physical damage can reduce the insulation performance of epoxy resin, which seriously threatens the reliability of electrical equipment. In this paper, the epoxy resin insulating composite was prepared by a microcapsule system to achieve its self-healing goal. The repair performance to physical damage was analyzed by the tests of scratch, cross-section damage, electric tree, and breakdown strength. The results show that compared with pure epoxy resin, the composite has the obvious self-healing performance. For mechanical damage, the maximum repair rate of physical structure is 100%, and the breakdown strength can be restored to 83% of the original state. For electrical damage, microcapsule can not only attract the electrical tree and inhibit its propagation process, but also repair the tubules of electrical tree effectively. Moreover, the repair rate is fast, which meets the application requirements of epoxy resin insulating material. In addition, the repair behavior is dominated by capillarity and molecular diffusion on the defect surface. Furthermore, the electrical properties of repaired part are greatly affected by the characteristics of damage interface and repair product. In a word, the composite shows better repair performance to physical damage, which is conducive to improving the reliability of electrical insulating materials.
Highlights
Epoxy resin has been widely used in the field of electrical insulating materials due to its high insulation strength, stable chemical performance, and excellent weatherability [1,2,3,4]
The results showed that the microcapsules can delay the development of electrical trees
The repair performance of composite to physical damage was verified from mechanical damage and electrical damage
Summary
Epoxy resin has been widely used in the field of electrical insulating materials due to its high insulation strength, stable chemical performance, and excellent weatherability [1,2,3,4]. The deterioration can lead to the physical damage in material, such as micro-voids and micro-cracks [4,5,6,7,8]. Micro defects can distort the electric field and lead to partial discharge, reducing the insulation performance of material [9,10,11]. The physical damage has a great impact on the operation of electrical power system. If the insulating material has the self-healing ability, the further deterioration of defects can be prevented in time. The electrical and mechanical performances of material can be restored, which can greatly reduce the impact of tiny physical damage on the power system. The existing research on self-healing material are mostly related to the mechanical performances of building and coating material, and rarely involve the
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