电力工程技术2026，Vol.45Issue(6)：95-104,10.DOI:10.12158/j.2096-3203.2026.06.010
热老化对电缆绝缘超低频介电性能和伏安特性的影响
Effect of thermal ageing on ultra-low frequency dielectric properties and volt-ampere characteristics of cable insulation
摘要
Abstract
To enhance the application of ultra-low frequency dielectric loss testing technology in evaluating cable insulation conditions and to improve the testing efficiency of ultra-low frequency dielectric spectroscopy,the dielectric properties of cross-linked polyethylene(XLPE)cable insulation before and after thermal aging are investigated using a improved frequency domain spectroscopy(iFDS).A novel method for characterizing the thermal aging state of cable insulation is proposed.Firstly,XLPE cable insulation samples with varying aging levels are prepared through thermal aging experiments.The dielectric properties of these aged XLPE samples are measured in the ultra-low frequency range from 10-3 Hz to 103 Hz.The results demonstrate that the ultra-low frequency dielectric spectrum is highly sensitive to changes in the XLPE state.As the test frequency decreases,the dielectric loss gradually increases,with more severely aged samples showing a more pronounced rise in dielectric loss.This indicates that ultra-low frequency dielectric loss exhibits strong anti-interference characteristics and can effectively detect XLPE aging conditions.Based on dielectric physics,the sharp increase in dielectric loss in the ultra-low frequency region is primarily attributed to the combined effects of DC conductance and interface polarization.Finally,a correlation between the ultra-low frequency dielectric spectrum and volt-ampere characteristics is established.A volt-ampere hysteresis loop,incorporating amplitude and phase information,is proposed to evaluate cable insulation aging.Relevant characteristic parameters,such as the rate of deflection angle change(RDA)and the rate of curve deformation(RCD),are extracted to characterize the aging status of cable insulation.关键词
超低频介电谱/热老化/交联聚乙烯(XLPE)电缆/伏安特性/滞回曲线/电缆绝缘老化状态Key words
ultra-low frequency dielectric spectrum/thermal ageing/cross-linked polyethylene(XLPE)cable/volt-ampere characteristic/hysteresis loop/aging state of cable insulation分类
信息技术与安全科学引用本文复制引用
孙海玉,蒋子宇,古国志,李恒宇,郭志家,赵学童..热老化对电缆绝缘超低频介电性能和伏安特性的影响[J].电力工程技术,2026,45(6):95-104,10.基金项目
国家自然科学基金资助项目(U23B20115) 本文得到国网河南省电力公司科技项目(5217B0240004)资助,谨此致谢! （U23B20115）
