极性反转条件下的油纸沿面绝缘界面电荷特性

发布时间：2018-01-08 00:22

本文关键词：极性反转条件下的油纸沿面绝缘界面电荷特性　出处：《高电压技术》2017年06期 　论文类型：期刊论文

【摘要】：高压直流输电系统出现潮流反转或电压陡变情况,换流变压器的油纸绝缘会承受极性反转电压,往往容易造成绝缘失效。为研究此过程中油纸绝缘界面电荷特性,利用静电容探头法测量了极性反转过程和电压陡变条件下油纸沿面绝缘结构界面电荷密度的变化。发现了油纸界面电荷能加强外施电压极性反转时刻的瞬态电场,加强程度与积聚的界面电荷密度成正比;油纸沿面绝缘结构和平行绝缘结构的界面电荷积聚时间差异显著,极性反转过程中会强化电场分布的不均匀程度;建议采用CIGRE推荐电压陡变波形(反转时间2 ms)作为对换流变压器出厂试验的考核。这些结论对改善换流变压器的绝缘设计和提高其运行维护可靠性有重要意义。
[Abstract]:HVDC system appears trend reversal or voltage change, will withstand the polarity reversal voltage insulation of converter transformer oil, often easy to cause insulation failure. As the research paper in the process of insulating interfacial charge characteristics, using the static capacitance probe method to measure the polarity reversal process and voltage change under the condition of oil change in charge the density structure of the interface along the surface of the insulation. It is found that the transient electric field can enhance the oil paper interface charge applied voltage polarity reversal time, surface charge density is proportional to the degree of strengthening and accumulation; paper surface insulation structure and insulation interface charge accumulation time structure difference, will strengthen the non-uniformity of the polarity of the electric field distribution in the process of inversion; proposals recommended by CIGRE (voltage change waveform inversion time 2 ms) as converter transformer factory test assessment. These conclusions to improve the rheological change It is of great significance to design the insulation of the press and improve the reliability of its operation and maintenance.

【作者单位】：广东电网公司电力科学研究院;华北电力大学新能源电力系统国家重点实验室;
【基金】：国家自然科学基金(51107038)~~
【分类号】：TM41;TM721.1
【正文快照】： 2.华北电力大学新能源电力系统国家重点实验室,北京102206)0引言1极性反转为换流变压器的一种特殊工况,在此过程中,换流变压器阀侧绕组承受的直流电压极性发生反转,从原来承受的正极性直流电压变为承受负极性直流电压,或反之[1-3]。这种情况通常出现在直流输电系统发生潮流反

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