Compatibility dependent space charge accumulation behavior of polypropylene/elastomer blend for HVDC cable insulation
Compatibility dependent space charge accumulation behavior of polypropylene/elastomer blend for HVDC cable insulation
复制标题
HVDC 电缆绝缘聚丙烯/弹性体共混物的兼容性相关空间电荷累积行为
DOI：
10.1109/tdei.2019.008528
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发表时间：
2020-06
影响因子：
3.1
通讯作者：
B.X. Du
中科院分区：
文献类型：
--
作者：
Y. Gao;J. Li;G. Chen;T. Han;B.X. Du
聚丙烯（PP）/弹性体共混物是一种很有前途的高压直流（HVDC）电缆绝缘材料。高压直流输电电缆中空间电荷的积累是影响高压直流输电系统安全稳定运行的重要因素。本文将丙烯基弹性体（PBE）和乙烯-辛烯共聚物弹性体（EOC）加入到聚丙烯（PP）中制备共混物试样。采用脉冲电声法（PEA）研究了PP/弹性体共混体系的空间电荷积累行为，考察了PP/弹性体相容性对空间电荷积累行为的影响。通过偏光显微镜（POM）、差示扫描量热法（DSC）、X射线衍射（XRD）和动态力学分析（DMA）等测试手段，研究了该体系的空间电荷积累行为。结果表明，PP/PBE共混物中的空间电荷量低于PP/EOC共混物。与PP/EOC共混物相比，PP/PBE共混物的结晶度更高，结晶形态完整，结晶形态为β晶型，PP与PBE的相容性更好。结果表明，由于相容性的原因，在PP/PBE共混物中形成了比PP/EOC共混物更深的陷阱中心，从而限制了电荷注入。
Polypropylene (PP)/elastomer blend is a promising candidate for high voltage direct current (HVDC) cable insulation. Space charge accumulation in HVDC cable is an important factor for safe and stable operation of HVDC transmission system. In this paper, propylene based elastomer (PBE) and ethylene-octene copolymer elastomer (EOC) were added into PP to prepare the blend sample. Space charge accumulation behavior was estimated by the pulsed electro-acoustic (PEA) method, and the influence of compatibility between the PP and the elastomer on the charge accumulation behavior was investigated. Polarized optical microscope (POM), differential scanning calorimetry (DSC), X-ray diffraction (XRD) and dynamic mechanical analysis (DMA) measurements were performed to assist the understanding of the compatibility dependent space charge accumulation behavior. The obtained results showed that the amount of space charge in the PP/PBE blend was lower than that in the PP/EOC blend. As compared with the PP/EOC blend, higher crystallinity with integrated crystal morphology and β-crystal form were observed in the PP/PBE blend for better compatibility between PP and PBE. It is suggested that deeper trap centers are formed in the PP/PBE blend than in the PP/EOC blend due to the compatibility, by which the charge injection is restricted.
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