高压直流电缆用交联聚乙烯绝缘材料交联特性及机理

发布时间：2018-03-25 07:25

本文选题：高压直流电缆　切入点：聚乙烯　出处：《高电压技术》2017年11期

【摘要】：高压直流电缆绝缘材料的交联特性直接影响电缆的运行温度和空间电荷特性,因而主要通过凝胶质量分数、流变行为和热延伸测试分别分析了北欧化工(试样1)和陶氏化学(试样2)生产的2种新型高压直流电缆用XLPE材料交联特性的差异,并研究了交联效应对材料空间电荷性能和热力学性能的影响。结果表明:试样2在低交联剂添加量的情况下保证了较高的交联度,耐热性较好。对比2种材料的空间电荷特性,发现试样1两电极附近的同极性注入较明显,而试样2内部的电荷注入较深。在低场强下,试样2内部积累的电荷量较少;而随着场强的增加,试样2内部积累的正电荷量变大,且电荷衰减速率较慢。此外,从XLPE的分子结构和结晶形态对2种材料的交联机理进行了探讨,研究结果为未来如何通过降低交联剂含量开发国产化高压直流电缆XLPE材料提供了新思路。
[Abstract]:The cross-linking characteristics of insulating materials for HVDC cables directly affect the operating temperature and space charge characteristics of the cables, and therefore mainly depend on the gel mass fraction. Rheological behavior and thermal extension tests were used to analyze the difference of crosslinking properties of two new XLPE materials for HVDC cables produced by Nordic chemical industry (sample 1) and Dow chemistry (sample 2), respectively. The effects of crosslinking effect on the space charge and thermodynamic properties of the materials were studied. The results showed that the cross-linking degree and heat resistance of sample 2 were higher and better than those of the two kinds of materials under the condition of low amount of crosslinking agent, and the space charge characteristics of the two materials were compared. It was found that the same polarity injection was more obvious in the vicinity of two electrodes in sample 1, but the charge injection was deeper in sample 2. At low field strength, the charge accumulated in sample 2 was less, and with the increase of field strength, the charge accumulation in specimen 2 was lower than that in sample 2. The amount of positive charge accumulated in sample 2 increased and the rate of charge decay was slow. In addition, the crosslinking mechanism of the two materials was discussed from the molecular structure and crystalline morphology of XLPE. The results provide a new idea for the development of home-made XLPE materials for HVDC cables by reducing the content of crosslinker.
【作者单位】：全球能源互联网研究院输变电技术国家重点实验室;西安交通大学电力设备电气绝缘国家重点实验室;
【基金】：国家重点研发计划(2016YFB0900702) 国家电网公司科技项目(5545DW160013)~~
【分类号】：TM21

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