高载流量柔性直流电缆绝缘料关键性能研究
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TM21

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国家电网有限公司科技项目"90℃柔性直流电缆绝缘料及海底电缆系统关键技术研究"


Investigation on the key properties of flexible HVDC cable insulating materials with the high carrying capacity
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    摘要:

    为实现高压柔性直流电缆绝缘材料国产化,文中通过添加纳米粒子方法制备了高载流量(工作温度90℃)柔性直流电缆绝缘料试样,开展了空间电荷、电阻率、直流击穿电场强度等关键电气性能指标的试验研究,并与高压交流电缆绝缘料和国外柔直电缆绝缘料这2种材料的相应试验结果进行了对比分析。结果表明,该柔直电缆绝缘料在常温(20℃)和高温(90℃)下具有良好的空间电荷抑制性能,电场畸变率小于5%;与其他2种材料相比,该绝缘料在高温下的电阻率增加约10倍、电阻率温度系数下降约1/3,能够降低柔直电缆的热损耗并有利于整个柔直电缆系统的绝缘设计;该绝缘料在高温下的直流击穿电场强度为其他2种材料的1.27~1.6倍。研究表明,该柔直电缆绝缘料电气性能优异,能够用于工作温度90℃的柔直电缆绝缘。

    Abstract:

    In order to realize the localization of high voltage direct current (HVDC) cable insulating materials, the insulating materials of HVDC flexible cable with the high carry capacity (90℃ of the working temperature) are prepared by nano filler doping method in this paper. The key parameters including space charge, resistivity, DC breakdown strength are investigated, and the results are compared with that of HVAC insulating materials and external HVDC insulating materials. It is found that the developed insulating materials have good space charge suppression performance at 20℃ and high temperature (90℃), and the electric field distortion ratio is less than 5%. Comparing to the two other materials, its resistivity increases by 10 times and the resistivity temperature coefficient decreases by 1/3 at high temperature, so it decreases the insulation heat loss and fits to the design of the cable system. Its DC breakdown strength at high temperature is 1.27~1.6 times as much as that of the two other materials. The research shows that the materials are suitable for the insulation of HVDC flexible cable with the working temperature of 90℃ for its perfect electrical performance.

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朱智恩,曾浩,杨黎明,高凯,李栋,陈龙啸,王传博.高载流量柔性直流电缆绝缘料关键性能研究[J].电力工程技术,2021,40(4):149-154

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历史
  • 收稿日期:2020-12-29
  • 最后修改日期:2021-03-02
  • 录用日期:2020-09-07
  • 在线发布日期: 2021-08-11
  • 出版日期: 2021-07-28