高电压技术2017，Vol.43Issue(11)：3599-3606,8.DOI:10.13336/j.1003-6520.hve.20171031015
高压直流电缆用交联聚乙烯绝缘材料交联特性及机理
Crosslinking Characteristic and Mechanism of Cross-linked Polyethylene Insulating Materials Used for High Voltage Direct Current Cables
摘要
Abstract
The crosslinking characteristic of insulating materials used for high-voltage direct-current (HVDC) cables will directly affect their operating temperature and space charge behaviors.Consequently,we analyzed the cross-linking characteristics of two new kinds of cross-linked polyethylene (XLPE) for HVDC cables respectively prepared by Borealis (sample 1) and Dow (sample 2) through the gel concentration,the rheological behavior,and thermal elongation testing.Moreover,we discussed the influences of cross-linking effect on the space charge behavior and thermo-mechanical properties of the XLPE.The results show that the sample 2 possesses the larger cross-linking degree and better heat resistance under lower content of cross-linking agent.For the space charge characteristics of the two materials,it is found that there is some injection of homocharge near the two electrodes of sample 1,while the charge injection is deeper inside the sample 2.Under the lower electrical field,there is less accumulation of charges in the sample 2.However,with the increase of electrical field,the accumulated positive charge inside the sample 2 will also increase and their decay rates are slower.Besides,the cross-linking mechanism of the two materials is explored from the molecular structure and crystal morphology.The results will provide novel routes to develop the domestic XLPE materials used for HVDC cables by decreasing the concentration of cross-linking agent.关键词
高压直流电缆/聚乙烯/交联度/空间电荷/流变性能Key words
HVDC cables/polyethylene/crosslinking degree/space charge/rheological properties引用本文复制引用
李维康,张翀,闫轰达,李文鹏,张伟,于凡..高压直流电缆用交联聚乙烯绝缘材料交联特性及机理[J].高电压技术,2017,43(11):3599-3606,8.基金项目
国家重点研发计划(2016YFB0900702) （2016YFB0900702）
国家电网公司科技项目(5545DW160013).Project supported by National Key Research and Development Plan (2016YFB0900702),Science and Technology Project of State Grid Cooperation of China (5545DW160013). （5545DW160013）
