高电压技术2023，Vol.49Issue(12)：4900-4910,11.DOI:10.13336/j.1003-6520.hve.20221605
220 kV XLPE绝缘材料长期老化性能及寿命评价
Long-term Aging Performances and Life Evaluation of 220 kV XLPE Insulation Materials
摘要
Abstract
The long-term aging performance of cross-linked polyethylene(XLPE)insulation material for high-voltage power cables will determine the operating reliability and working life of cables.This work aims to evaluate the long-term working reliability of the domestic 220 kV XLPE insulation material.An imported 220 kV XLPE cable insulation materi-al was taken as a reference,and the electrical and thermal aging characteristics of domesticaly trial-produced 220 kV cable material were comparatively studied.For the two 220 kV AC cable insulation materials,the long-term ther-mal-oxidative aging tests were carried out,and the mechanical properties,infrared spectroscopy and differential scanning calorimetry(DSC)were used to characterize the thermal-oxidative aging behavior of the materials.Then the constant stress electrical aging tests were carried out using sheet samples.According to the aging life theoretical model,the ther-mal-oxidative aging and electrical aging lives of the two 220 kV XLPE insulating materials were evaluated.The thermal-oxidative aging test results show that the oxidation rate of domestic trial-produced material is slower,however,its crystallization and mechanical property are relatively inferior.If when the mechanical property is dropped to 30％of the initial value is set as the insulation failure criterion,the thermal-oxidative aging life of imported and domestic materials are 32.85 years and 29.14 years,respectively.The thermal-oxidative aging resistance of domestic trial-produced material is slightly inferior to that of imported material.The constant stress long-term electrical aging test results show that the n indexes of electrical aging life for imported material and domestic trial-produced material are 16.84 and 17.03,respec-tively.The electrical aging resistance of the domestic trial-produced material is relatively better.The long-term aging performances of domestic 220 kV cable insulation material have reached the level close to that of imported materials.关键词
交联聚乙烯/电缆绝缘/热氧老化/电老化/老化寿命Key words
cross-linked polyethylene/cable insulation/thermal-oxidative aging/electrical aging/aging life引用本文复制引用
侯帅,傅明利,贾磊,伍国兴,罗智奕,徐曙..220 kV XLPE绝缘材料长期老化性能及寿命评价[J].高电压技术,2023,49(12):4900-4910,11.基金项目
南方电网公司重点科技项目(SZKJXM20190588).Project supported by Key Science and Technology Project of China Southern Power Grid(SZKJXM20190588). （SZKJXM20190588）
