张吼,韩幸军,郭安琪,施佳昊,郑宏
ZHANG Hou,HAN Xingjun,GUO Anqi,SHI Jiahao,ZHENG Hong

• 1:浙江省电力有限公司舟山供电公司
• 2:哈尔滨理工大学
• 3:杭州柯林电气股份有限公司

摘要(Abstract)：

环氧树脂浸渍绝缘纸作为柔直穿墙套管的主绝缘存在电场分布不均匀等问题。详细分析了某柔性直流换流站穿墙套管绝缘击穿事故的原因，并结合套管环氧树脂电芯体材料特性，采用添加纳米SiO_2（二氧化硅）改性环氧树脂的方法来提高套管的电气性能和热性能。实验表明，当纳米SiO_2添加量为4%（质量分数）时，环氧树脂固化物的相对介电常数下降到4.23(50 Hz时)，介质损耗因数为0.002(50 Hz时)，击穿场强达到了31 kV/mm，体积电阻率为3.7×10~(13)Ω·m。同时归纳总结了纳米SiO_2对环氧树脂基本物理性质与主要电热性质的影响，以期进一步改善穿墙套管材料电气绝缘性能。
Epoxy resin-impregnated insulating paper(RIP), the main insulation of wall bushings, is characterized by its uneven electric field distribution. The causes of insulation breakdown of the wall bushing in a flexible DC converter station are analyzed. Furthermore, the method of adding nano-SiO_2(silicon dioxide) to modify epoxy resin is adopted to improve the electrical and thermal properties of the bushing in view of the material characteristics of the epoxy resin core. The experiments show that the relative dielectric constant of the cured epoxy resin decreases to 4.23(at 50 Hz), the dielectric loss factor is 0.002(at 50 Hz), the breakdown field strength reaches 31 kV/mm, and the volume resistivity is 3.7×10~(13) Ω·m when the nano-SiO_2 is added with a mass fraction of 4%. The effects of nano-SiO_2 on the basic physical characteristics and main electrothermal characteristics of epoxy resin are summarized to further improve the electrical insulation properties of the wall bushing material.

关键词(KeyWords)： 柔性直流输电;穿墙套管;环氧树脂;纳米粒子
flexible DC transmission;wall bushing;epoxy resin;nanoparticles

Abstract:

Keywords:

基金项目(Foundation): 国网浙江省电力有限公司科技项目（5211ZS22000L）

作者(Author): 张吼,韩幸军,郭安琪,施佳昊,郑宏
ZHANG Hou,HAN Xingjun,GUO Anqi,SHI Jiahao,ZHENG Hong

DOI: 10.19585/j.zjdl.202305013

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