电力工程技术2026，Vol.45Issue(3)：20-27,8.DOI:10.12158/j.2096-3203.2026.03.003
老旧XLPE电缆绝缘状态评估方法及其应用
Condition assessment method of old XLPE cable insulation and its application
摘要
Abstract
The stable operation of the power cable system is profoundly affected by the aging degree of the main insulation material cross-linked polyethylene(XLPE).In this paper,firstly,the accelerated aging experiments are carried out on the XLPE insulation of unused cables.Based on the changes in their macroscopic properties and microscopic structures,it is found that the antioxidant index can be used as an evaluation parameter for the insulation condition of old XLPE cables.Then,this method is applied to the aging assessment of XLPE in cables that have been in operation for 25 and 30 years.The results show that the mechanical,thermal,and electrical properties of XLPE,as well as its molecular and crystalline structure,deteriorate slowly at first and then quickly during the ageing process.The inflection point of change can be observed.The antioxidant index of XLPE decreases monotonically and continuously with the aging time.No inflection point is observed for the antioxidant index.Therefore,the antioxidant index can be used as an effective parameter for assessing the aging degree of old cables.The macroscopic performance and microstructure parameters of the 25-year-old XLPE cable are positioned before the inflection point of the accelerated aging curve of the unused XLPE cable insulation,while those of the 30-year-old XLPE cable are after the inflection point.Changes in these parameters are minimal compared to the results of testing the unused XLPE cable insulation.However,their antioxidant indices differ significantly.The internal antioxidant index of the XLPE insulation in the 25-year-old cable is far from the inflection point.And the 25-year-old cable insulation has not yet entered the stage of rapid performance deterioration.However,the internal antioxidants in the XLPE insulation of the 30-year-old cable have been exhausted.It is in the rapid deterioration stage.Therefore,its operating status requires high attention.Based on the significant findings of this study,standardized aging assessment method of actual operating cables may be established.关键词
交联聚乙烯(XLPE)/老旧电缆/加速老化/抗氧剂/临界时间/状态评估Key words
cross-linked polyethylene(XLPE)/old cables/accelerated aging/antioxidant/critical time/status assessment分类
信息技术与安全科学引用本文复制引用
蒋浩月,常凯颖,伊德伦,隋浩然,武康宁,李建英..老旧XLPE电缆绝缘状态评估方法及其应用[J].电力工程技术,2026,45(3):20-27,8.基金项目
国家自然科学基金资助项目(524B2096) （524B2096）
中央高校基本科研业务费专项资金资助项目(xzy012024013) （xzy012024013）
