10 kV电缆中间接头典型施工缺陷的电场及局放特性研究
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TM575

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国家自然科学基金资助项目(51807110)

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    摘要:

    电力电缆故障多发生于中间接头位置,而施工缺陷是引发中间接头故障最主要的原因。为评估电缆中间接头典型施工缺陷的危害性,文中建立电缆中间接头三维有限元模型,分析电缆中间接头存在硅脂涂抹不均匀、主绝缘划伤和接头受潮3种施工缺陷时的电场分布规律,探究不同缺陷位置与场强之间的关系,并搭建工频交流电压局放试验平台对试样进行局放试验。结果表明:硅脂涂抹不均匀时,空气间隙在应力锥周围造成的电场畸变程度最严重;远离应力锥时,场强逐渐减小。主绝缘划伤时,电场畸变最为严重,空气间隙在外半导切断处场强最大。接头受潮后,当水膜位于应力锥附近时,电场畸变程度最为剧烈。相同加压条件下,接头受潮、硅脂涂抹不均匀、主绝缘划伤3种缺陷造成局部放电的次数依次增加。

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Electric field and local discharge characteristics of typical construction defects of 10 kV cable intermediate joint
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Study on the influence mechanism and regulation of large suspended potential conductor on impulse discharge characteristics of air gap operation

    Abstract:

    The paramount reason for the malfunction of a center connecting joint,where considers to be the major fault point of power cables,is construction deficiencies. As a result,a three-dimensional finite element model is generated in order to evaluate hazards of the construction deficiency towards the intermediate joint of the cable. Furthermore,this article analyzes the patterns of electric field distribution when three kinds of construction-deficiencies occurs including uneven application of silicone grease,scratches on the surface of major insulation and moisture into the intermediate connector. The last but not least,the article explores the relation of the fault location to the field strength. Additionally,a platform for partial discharge test in the context of alternating voltage is established for verifying samples. The results show that the most significant electric field distortion appears when the silicone grease is unevenly applied and the air gap emerges near the stress cone. While oppositely,the field strength decreases gradually when the air gap position is away from the stress cone. Besides,the most serious electric field distortion is visible while the major insulation has scratches. Also the field strength is maximized at the cut-off of the outer semi-conducting layer. Moreover,the most intense electric field distortion arises from when water membrane is close to the stress cone due to moisture ingress into the joint. In addition,numbers of discharge increase successively in the partial discharge test conducted at the same voltage and under the circumstances of above mentioned three kinds of construction deficiencies.

引用本文

陶玉宁,陈皇熹,赵国伟,方春华.10 kV电缆中间接头典型施工缺陷的电场及局放特性研究[J].电力工程技术,2021,40(5):114-120

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  • 收稿日期:2021-04-27
  • 最后修改日期:2021-07-06
  • 录用日期:2020-11-09
  • 在线发布日期: 2021-09-30
  • 出版日期: 2021-09-28