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首页> 外文期刊>IEEE Transactions on Dielectrics and Electrical Insulation >Growth and partial discharge characteristics of electrical tree in XLPE under AC-DC composite voltage
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Growth and partial discharge characteristics of electrical tree in XLPE under AC-DC composite voltage

机译：交直流复合电压下交联聚乙烯中电树的生长和局部放电特性

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摘要

The growth characteristics of electrical trees under DC and AC voltages are quite different. In order to investigate the influences of AC component in HVDC cable system on the electrical tree properties, the growth and discharge characteristics of electrical trees under AC-DC composite voltages were studied in this paper. The results showed that the AC component greatly accelerated the developing process of the electrical trees. The influences of the positive and negative DC bias voltages on the electrical tree growth properties were quite different. The growth rate under negative DC bias voltage was similar to that under pure AC voltage and pine-branch type electrical trees were more likely to form. In contrast, the growth rate of the electrical tree increased with the increase of the positive DC bias voltage and it was much faster than the negative DC biased one. More branch-like electrical trees would form under positive DC bias voltage. When the AC component decreased, the developing process of the electrical tree was fairly tough and it was easy to form bush-like electrical trees, which were the typical conducive electrical trees with fairly small discharges. Under the positive DC bias voltage, there was a fast re-growth process of electrical tree after the bush tree formed, and the positive DC bias voltage could promote the coming of the re-growth process. However, the detected partial discharge during this process was quite small. The test results indicated that it may pose a great threat to the safety of the cable insulation if there is a large AC component in the HVDC cable system.
机译：在直流和交流电压下，电树的生长特性完全不同。为了研究高压直流输电系统中交流分量对电气树性能的影响，研究了交直流复合电压下电气树的生长和放电特性。结果表明，交流分量极大地促进了电树的发育过程。正负直流偏置电压对电气树生长特性的影响是完全不同的。负直流偏置电压下的增长率与纯交流电压下的增长率相似，并且更容易形成松枝型电树。相反，电树的生长速率随正向直流偏置电压的增加而增加，并且比负向直流偏置的树快得多。在正的直流偏置电压下会形成更多的分支状电树。当交流分量减少时，电树的发育过程相当艰难，很容易形成灌木状电树，这是典型的导电性电树，排放量很小。在正直流偏置电压下，灌木树形成后，电气树有一个快速的重新生长过程，正直流偏置电压可以促进重新生长过程的到来。但是，在此过程中检测到的局部放电非常小。测试结果表明，如果高压直流输电电缆系统中有很大的交流分量，则可能对电缆绝缘的安全性构成巨大威胁。

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  • 作者

    Mechen Liu; Yunpeng Liu; Yanda Li; Ping Zheng; Haoran Rui;

  • 作者单位

    Hebei Provincial Key Laboratory of Power Transmission Equipment Security Defense, North China Electric Power University, Baoding city, Hebei Province, 071003, China;

    Hebei Provincial Key Laboratory of Power Transmission Equipment Security Defense, North China Electric Power University, Baoding city, Hebei Province, 071003, China, State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources, North China Electric Power University, Beijing 102206, China;

    Hebei Provincial Key Laboratory of Power Transmission Equipment Security Defense, North China Electric Power University, Baoding city, Hebei Province, 071003, China;

    Hebei Provincial Key Laboratory of Power Transmission Equipment Security Defense, North China Electric Power University, Baoding city, Hebei Province, 071003, China;

    Hebei Provincial Key Laboratory of Power Transmission Equipment Security Defense, North China Electric Power University, Baoding city, Hebei Province, 071003, China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Partial discharges; Electrodes; HVDC transmission; Cable insulation; Needles; Microscopy; Containers;

    机译：局部放电;电极;高压直流输电;电缆绝缘;针;显微镜;容器;

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