高压直流交联聚乙烯电缆应用与研究进展

发布时间：2018-04-27 05:42

本文选题：高压直流 + 交联聚乙烯电缆　；参考：《高电压技术》2017年02期

【摘要】：近20年来,交联聚乙烯(XLPE)绝缘电缆因其重量轻、工作温度高、输送功率大等优点而在高压直流(HVDC)输电工程中得到广泛应用与发展。直流电缆及其附件绝缘长期处于直流电场作用下,存在严重的空间电荷积聚问题。为此,综合国内外研究论述了极性反转电压和温度梯度场对直流电缆绝缘介质空间电荷特性的影响规律,分析了直流电缆附件双层介质界面电荷的分布规律及抑制方法,最后展望了免交联绝缘直流电缆的发展趋势。研究结果表明:极性反转后的外施电场与空间电荷感应电场发生叠加,加剧了绝缘介质内部电场畸变;温度梯度场加速了高温侧空间电荷的注入和输运过程,导致空间电荷在绝缘介质低温侧积聚;电缆主绝缘与附件增强绝缘间的电导不连续性导致其界面处产生电荷积聚,而通过在主绝缘与增强绝缘间增加非线性控制层可以有效抑制界面电荷;热塑性电缆绝缘材料具有免交联和可回收的优点,是未来直流电缆绝缘的发展方向之一。这些研究结果的总结和概述可以为解决直流电缆及其附件绝缘的空间电荷积聚问题提供参考。
[Abstract]:In recent 20 years, XLPE (XLPE) insulated cable has been widely used and developed in HVDC transmission engineering because of its advantages of light weight, high working temperature and high transmission power. The insulation of DC cable and its accessories is under the action of DC electric field for a long time, there is serious space charge accumulation problem. In this paper, the influence of polarity reversal voltage and temperature gradient field on the space charge characteristics of DC cable insulator is discussed, and the distribution law and suppression method of double layer dielectric interface charge of DC cable accessory are analyzed. Finally, the development trend of DC cable with non-AC insulation is prospected. The results show that the superposition of the external applied electric field and the space charge induced electric field after polarity reversal intensifies the electric field distortion in the insulating medium, and the temperature gradient field accelerates the injection and transport process of the space charge at the high temperature side. The space charge accumulates at the low temperature side of the insulating medium, and the conductance discontinuity between the main insulation of the cable and the reinforced insulation of the attachment results in the charge accumulation at the interface of the cable. The interface charge can be effectively suppressed by adding nonlinear control layer between the main insulation and the reinforced insulation. Thermoplastic cable insulation material has the advantages of no-AC connection and recoverability, so it is one of the development directions of DC cable insulation in the future. The summary and summary of these results can provide a reference for solving the problem of space charge accumulation in DC cable and its accessories insulation.
【作者单位】：天津大学电气与自动化工程学院;
【基金】：国家重点基础研究发展计划(973计划)(2014CB239501) 国家重点研发计划(2016YFB0900701) 国家自然科学基金(51537008)~~
【分类号】：TM247

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