直流XLPE电缆绝缘中空间电荷的抑制方法综述

交联聚乙烯(XLPE)因其优异的介电、理化性能而被广泛应用于电缆绝缘领域。在电缆的服役过程中,电缆绝缘内部会积聚空间电荷,严重时可引发电场畸变,导致电缆击穿事故发生。对于直流XLPE电缆,空间电荷的积聚及影响更加不容忽视。针对直流XLPE电缆绝缘中产生的空间电荷积聚效应,目前学界主要采用共混改性、聚合物链段接枝极性基团、纳米掺杂改性及制备高纯净绝缘料等方法来进行控制,改性后的直流XLPE电缆绝缘对空间电荷产生的抑制效果均有所提升。文中首先对上述直流XLPE电缆绝缘中空间电荷的抑制方法进行综述,介绍其抑制原理以及相应的抑制效果,然后对比总结不同抑制空间电荷方法的优缺点,最后对未来直流XLPE电缆绝缘中空间电荷抑制方法的研究发展作出展望。

Summarization of space charge suppression methods in DC XLPE cable insulation

Cross-linked polyethylene (XLPE) is widely used in the field of cable insulation due to its excellent dielectric and physical and chemical properties.During the service of the cable, space charges will accumulate inside the cable insulation, which can cause electric field distortion in severe cases, leading to cable breakdown accidents.Especially for DC XLPE cables, the accumulation and influence of space charge cannot be ignored.Aiming at the space charge accumulation effect generated in DC XLPE cable insulation, the current academic circles mainly adopt methods such as blending modification, polymer segment grafting polar groups, nano-doping modification and preparation of high-purity insulating materials.The modified DC XLPE cable insulation has an improved suppression effect on space charge generation.This article mainly summarizes the suppression methods of space charge in the above-mentioned DC XLPE cable insulation, introduces its suppression principles and corresponding suppression effects, and compares and summarizes the advantages and disadvantages of different space charge suppression methods. Finally, the future DC XLPE cable The research and development of space charge suppression methods in insulation are prospected.