摘要
交联聚乙烯(XLPE)电缆在运行过程中接头部分极易受潮,导致绝缘性能下降,影响其正常运行。为了探究交联聚乙烯受潮对其相对介电常数(εr)和介质损耗因数(tanδ)的影响,以片状XLPE试样为研究对象,测量其在不同浸水时间的εr和tanδ随频率的变化,并对试样的超低频介质损耗因数tanδ0.1 Hz和工频介质损耗因数tanδ50 Hz进行Pearson相关分析,最后对浸水前后的XLPE试样进行红外光谱分析。结果表明:不同浸水时间XLPE试样的tanδ0.1 Hz比tanδ50 Hz大2.36~3.28倍,tanδ0.1 Hz、tanδ50 Hz及εr均随浸水时间的增加而增大,其中tanδ0.1 Hz的增大趋势更显著;tanδ0.1 Hz与tanδ50 Hz具有强相关性;红外光谱测试结果表明,XLPE分子结构中部分亚甲基变为H-C-OH基团,有水分以结构水的形式存在于浸水后的试样中。
The joint parts are easily affected by moisture in the operation process of XLPE cable, which would lead to the decline of insulating properties, affecting the normal operation of cable. In order to study the effects of XLPE moisturing on its dielectric constant(εr) and dielectric loss factor(tanδ), a XLPE sheet specimen was used as research object, and the variations of its εrand tanδ with frequency under different immersion time were measured. And then the ultra-low frequency dielectric loss factor(tanδ0.1 Hz) and power frequency dielectric loss factor(tanδ50 Hz) of the sample was carried out Pearson correlation analysis. Finally, the samples before and after immersion were tested by infrared spectroscopy. The results show that the tanδ0.1 Hzof the samples with different immersion time is 2.36~3.28 times larger than tanδ50 Hz, the tanδ0.1 Hz, tanδ50 Hz, and εrincrease with the increase of immersion time, and the increasing trend of tanδ0.1 Hzis more significant. There is a strong correlation between tanδ0.1 Hzand tanδ50 Hz. The infrared spectrum test result show that some methylene groups in XLPE molecular structure change into H-C-OH group, and there is water existed in the immersed sample in the form of structural water.
作者
齐伟强
胡则剑
徐兴全
陶贺香
任志刚
桂媛
郭卫
于钦学
QI Weiqiang;HU Zejian;XU Xingquan;TAO Hexiang;REN Zhigang;GUI Yuan;GUO Wei;YU Qinxue(State Grid Beijing Electric Power Research Institute,Beijing 100076,China;State Key Laboratory of Electrical Insulation and Power Equipment,Xi'an Jiaotong University,Xi'an 710049,China)
出处
《绝缘材料》
CAS
北大核心
2019年第12期53-57,共5页
Insulating Materials
关键词
超低频
介质损耗因数
XLPE
浸水特性
ultralow frequency
dielectric loss factor
cross-linked polyethylene
immersion characteristics
