屏蔽材料离子含量对抗水树XLPE电力电缆击穿特性的影响(英文)

Cable made with Dow HFDA-0587 BK,HFDB-4202 EC,and HFDA-0693 BK was found to meet DL/T 1070-2007 requirement of tree retardant XLPE(TR-XLPE) power cable.The alternate-current breakdown(ACBD) value after 360 days of accelerated water treeing test(AWTT) was 29 kV/mm,which exceeds the DL/T 1070-2007 requirement of at least 20 kV/mm.Cable made with semiconductive shield materials from other material suppliers and HFDB-4202 EC,however,failed to meet DL/T 1070-2007 requirement of at least 20 kV/mm after 360 days of AWTT.This failure to meet DL/T 1070-2007 requirement,apparently,was caused by the high content of ionic contaminants and ash levels in the semiconductive shield materials.The results in this report suggest the use of clean semiconductive shield materials is necessary,in conjunction with tree retardant insulation material,for cables to meet the higher performance TR-XLPE DL/T 1070-2007 requirement,which will enhance system reliability by extending cable life,while lowering life cycle costs.     

交联聚乙烯高压电缆脱气效率研究

交联聚乙烯电缆具有优良的电气性能和机械性能,在高压及超高压电力传输中得到广泛应用。使用平板扩散模型对高压电缆缆芯的脱气过程进行了模拟,讨论了脱气温度、绝缘厚度对脱气时间的影响,并且采用气相色谱法测量了高压电缆缆芯中副产物含量随脱气时间的变化,比较了传统交联聚乙烯与陶氏化学新一代交联聚乙烯不同的脱气效率,结果表明新一代交联聚乙烯能够有效缩短脱气时间达40%。