高电压技术2017，Vol.43Issue(11)：3543-3550,8.DOI:10.13336/j.1003-6520.hve.20171031008
基于双电层理论的正/负极性直流电场下水树生长特性
Water Tree Propagation Characteristics Under Positive/Negative Polarity DC Electric Field Based on Electrical Double Layer Theory
摘要
Abstract
To reveal the relationship of water tree propagation characteristics and DC electric field in XLPE power cables,accelerated water tree aging experiments of XLPE samples were performed under positive/negative DC electric field,and the influences of the XLPE/solution interface structure under different polarities DC electric field on the migration of ions and water molecules into XLPE material were investigated.Moreover,the electric field distribution of water tree regions under different polarities DC electric field was analyzed,and a possible mechanism was presented to explain how polarities of DC electric field affected water tree propagation.The results show water trees under negative DC electric field are significantly longer than those under positive DC electric field.Because of the characteristic adsorption of chloride ions on the XLPE material's surface under negative DC electric field,there is no water dipole layer of the interface to impede chloride ions migration.Therefore,the numbers of ions and water molecules in XLPE samples are greater,which lead to greater electric field strength at water tree tips and serious water treeing aging under negative DC electric field.Consequently,based on the electrical double-layer theory of the XLPE/solution interface,water trees under negative DC electric field propagate longer and more seriously than those under positive DC electric field.关键词
交联聚乙烯/直流电场/水树/离子/双电层/特性吸附Key words
XLPE/DC electric field/water treeing/ions/electrical double layer/characteristic adsorption引用本文复制引用
周凯,李天华,杨明亮,黄明,朱光亚..基于双电层理论的正/负极性直流电场下水树生长特性[J].高电压技术,2017,43(11):3543-3550,8.基金项目
国家自然科学基金(51477106).Project supported by National Natural Science Foundation of China (51477106). （51477106）
