Abstract
Low-density polyethylene (LDPE) is one of the most comprehensive products used as insulation materials in power equipment. How to improve its dielectric properties by doping inorganic particles in LDPE has always been the focus of many researchers. In this paper, silica (SiO2) particles and montmorillonite (MMT) particles were added to LDPE, the order of adding particles was changed, and different micro-nano composites was made. The crystallization characteristics of composites were analyzed, the curves of the conductance current with the change of field intensity were analyzed, and the space charge distribution of each material were investigated. The results of crystallization show that the crystalline properties and crystallinity of the composites are higher than the matrix LDPE, the addition of SiO2 particles increases the composites’ crystallinity significantly, and the intercellular spacing of micro-nano composites is the smallest among all materials. The curve of conductance current versus electric field intensity shows that the tightness of the crystal structure can effectively hinder the movement of the molecular chain, inhibit carrier migration, while shortening the free travel of electrons, thereby reducing the electric conduction current of the material. The experimental results of the space charge accumulation curve further show that the compact crystal structure of the material is beneficial to the dissipation of space charge in the dielectric.
Highlights
High-voltage DC cable provides the possibility of accurate and real-time control of power transmission in a power system
The accumulation of space charge leads to the distortion of a local electric field in the material that leads to the aging phenomenon of the material, which greatly shortens the life of the material and causes serious engineering loss [3]
In order to improve the crystallization properties, conductivity current performance and space charge inhibition of micro-nano composite materials, the particle addition content was set as 1%, and MMT was treated with coupling agent KH570 in this article
Summary
High-voltage DC cable provides the possibility of accurate and real-time control of power transmission in a power system. It can make the asynchronous interconnection of power grid safe and stable in different frequencies and incompatible states. It is still widely regarded at home and abroad as a cutting-edge technology. Low density polyethylene (LDPE) is widely used in the production of high voltage DC cable because of its excellent electrical insulation performance and processing characteristics [1,2]. In DC electric field, pure polyethylene materials still face many problems, the most serious is space charge accumulation. The accumulation of space charge leads to the distortion of a local electric field in the material that leads to the aging phenomenon of the material, which greatly shortens the life of the material and causes serious engineering loss [3]
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