摘要
为掌握电缆水树老化程度对电缆主绝缘介电特性的影响规律,对交联聚乙烯(cross-linked polyethylene,XLPE)开展加速水树老化试验,以低密度聚乙烯为对照组,测量不同老化程度试样的介电常数(ε)、介质损耗因数(tanδ)、结晶度以及熔点等特征参量,并利用显微技术观测XLPE水树的生长特性。结果表明:XLPE材料的ε和低频下tanδ随水树老化程度加深而呈现增大的趋势。水树在发展过程中呈现放射状,且密集度不断增加。建立XLPE材料的tanδ宏观参量与微观水树老化发展的对应关系,可通过低频下电缆主绝缘材料XLPE的tanδ值评估电缆水树老化的严重程度。
In order to study the influence of water tree ageing degree on the dielectric properties of cables main insulation, the accelerated water tree ageing test was conducted on cross-linked polyethylene （XLPE）. The dielectric constant （ε）, dielectric loss factor （tanδ）, crystallization, melting point, and other characteristic parameters of the samples with different ageing degree were measured using low density polyethylene as the control group, and the growth characteristics of water trees in XLPE were observed by microscopy. The results show that the dielectric constant and dielectric loss factor at low frequency of XLPE material increase with the increase of ageing degree of water trees. Water trees are radial, and its intensity increase constantly in the process of development. Building the relationship between macro parameter （tanδ） and the micro development process of water tree in XLPE material, the ageing degree of water tree in cable can be evaluated by tanδ value of the XLPE in the main insulation material at low frequency.
作者
周远翔
刘杰
沙彦超
徐党国
李大卫
郑一博
ZHOU Yuanxiang;LIU Jie;SHA Yanchao;XU Dangguo;LI Dawei;ZHENG Yibo(State Key Laboratory of Control and Simulation of Power System and Generation Equipments, Tsinghua University, Beijing 100084, China;School of Electrical Engineering, Zhengzhou University, Zhengzhou 450001, China;JIBEI Electric Power Company Research Institute of State Grid, Beijing 100045, China)
出处
《绝缘材料》
CAS
北大核心
2018年第4期36-42,共7页
Insulating Materials
基金
国家重点基础研究发展计划(973计划)项目(2014CB239501)
国家电网公司科技项目(52018K15000R)
关键词
水树老化
XLPE
介质损耗因数
理化特性
water tree ageing
XLPE
dielectric loss factor
physical-chemical properties
