中国电机工程学报2024，Vol.44Issue(22)：9076-9086,中插32,12.DOI:10.13334/j.0258-8013.pcsee.231728
热老化对XLPE电缆本体中典型缺陷所引发的电场畸变的影响
Influence of Thermal Aging on Electric Field Distortion Caused by Typical Defects in XLPE Cable
摘要
Abstract
The local electric field distortion resulted from defects is one of the important causes of cable faults.The existing simulation research on defects mainly focuses on unused power cables,lacking research on the impact of aging process on the electric field distortion caused by defects.In this paper,the distribution function of the relative dielectric constant of crosslinked polyethylene(XLPE)insulation along the radial direction of the cable considering the thermal aging factor is constructed.The influences of thermal aging on the electric field distortion caused by five typical defects of outer sheath damage,moisture droplets,impurity particles,semi-conductive layer protrusion and water tree branches in the cable body are studied by COMSOL finite element simulation software.The simulation results show that all five typical defects can cause electric field distortion,with water tree branches causing the highest electric field distortion rate of 456.2%.The electric field distortion rate caused by the damage defect of the outer sheath is the lowest,at 51.6%.During the thermal aging process,the electric field distortion caused by defects near the outer semi-conduction layer gradually increases with the increase of aging time,leading to an increased risk of discharge faults,while near the inner semi-conduction layer,the distortion gradually diminishes,showing a self-healing trend.The electric field distortion caused by defects in the middle of the insulation is not sensitive to thermal aging.The above results are derived from the nonlinear distribution of the relative permittivity of the thermally aged XLPE cable insulation along the radial direction of the cable.The distribution function of relative permittivity along the radial direction of the cable and the method for deriving this function will help to more accurately study the electric field distribution characteristics of aging and in-service cable insulation under alternating electric fields.关键词
交联聚乙烯电缆/热老化/典型缺陷/有限元仿真/电场畸变Key words
crosslinked polyethylene(XLPE)cable/thermal aging/typical defects/finite element simulation/electric field distortion分类
信息技术与安全科学引用本文复制引用
朱梦瑶,李欢,张瑞祥..热老化对XLPE电缆本体中典型缺陷所引发的电场畸变的影响[J].中国电机工程学报,2024,44(22):9076-9086,中插32,12.基金项目
陕西省教育厅一般专项项目(22JK0322). General Special Project of Shaanxi Provincial Department of Education(22JK0322). （22JK0322）
