空间电荷及金属颗粒对换流变阀侧套管的电场分布影响
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TM42

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国家自然科学基金资助项目(51877169)


Influence of space charge and metal particles on the electric field distribution of converter transformer is valve-side bushing
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    摘要:

    换流变压器阀侧套管承受交、直流复合电压,对套管的性能和质量有严格的要求。直流电压下,不同介质界面处空间电荷积聚会引起局部电场的畸变,金属颗粒的存在也会大幅提高局部场强,二者均会降低套管的绝缘性能。文中根据换流变压器阀侧套管的结构,采用有限元分析软件,建立了阀侧套管的仿真模型,分析了加入空间电荷后不同类型电压下套管的电场分布以及金属颗粒对局部电场的影响。结果表明,直流电压下介质界面处空间电荷更容易积聚,交直流复合电压下空间电荷能够引发套管内部局部电场的畸变。与交流电压相比,直流电压下金属颗粒对局部电场的畸变程度影响更大,在SF6气体中金属颗粒对电场畸变程度的影响大小与其所在位置的关系不大。

    Abstract:

    The valve-side bushing of converter transformer bears AC-DC compound voltage, which has strict requirements on the performance and quality of the bushing. Under DC voltage, the accumulation of space charge at the interface of different medium causes the distortion of local electric field, and the existence of metal particles greatly increases the local electric field strength, both of which reduce the insulation performance of the bushing. In this paper, according to the structure of valve-side bushing of converter transformer, the simulation model of valve-side bushing is established by using finite element analysis software. The electric field distribution of the bushing under different types of voltage after adding space charge and the influence of metal particles on the local electric field are analyzed. The results show that the space charge at the dielectric interface is easier to accumulate under DC voltage, and the space charge is able to cause the distortion of the local electric field inside the bushing under AC-DC compound voltage. The degree of local electric field distortion of metal particles under DC voltage is greater than that under AC voltage, and the influence of metal particles on the degree of electric field distortion has little to do with its location in SF6.

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孟旋,郭若琛,袁文泽,李军浩.空间电荷及金属颗粒对换流变阀侧套管的电场分布影响[J].电力工程技术,2022,41(1):48-55

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历史
  • 收稿日期:2021-09-19
  • 最后修改日期:2021-11-23
  • 录用日期:2021-03-18
  • 在线发布日期: 2022-01-27
  • 出版日期: 2022-01-28