| 沿面闪络用非介入式表面电位测量研究 |
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| 作者姓名： | 范路 耿伊雯 王亚林 尹毅 |
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| 作者单位： | 上海交通大学电子信息与电气工程学院,上海交通大学电子信息与电气工程学院,国网江苏省电力有限公司电力科学研究院,上海交通大学电子信息与电气工程学院,上海交通大学电子信息与电气工程学院 |
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| 基金项目： | 国家自然科学基金资助项目（52007114） |
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| 摘 要： | 沿面闪络是威胁气体绝缘封闭开关(GIS)安全运行的重要事故,支撑绝缘“三结合点”处的表面电场畸变易产生电荷积聚并最终演变成持续性沿面闪络。本文通过对指形电极沿面闪络装置进行非介入式表面电位测量,并通过有限元分析软件验证实验装置的可行性,在本文的仿真参数设定下,非介入式测量误差仅为2.42%。利用该实验装置对添加纳米SiO2质量分数为2 wt%的环氧试样进行表面电位测量,升压速率为0.5 kV/5 min。当施加电压不足以引发沿面闪络时,纳米颗粒的添加引起的Maxwell-Wagner界面极化使得表面电位呈现衰减现象。当施加电压接近闪络电压时,表面电位衰减过程出现周期性回升现象,且回升现象出现的频率随施加电压升高而变快,闪络前表面电位衰减过程中的回升现象能够作为预测沿面闪络的一种信号。当施加电压为5 kV时,发生沿面闪络现象,闪络过程表现为间歇性闪络向持续性闪络的过渡。在间歇性闪络阶段,表面电位的幅值出现极性反转现象,可能与瞬间短路引起的电子沿面泄露和Maxwell-Wagner界面去极化有关。持续性闪络阶段表面电位的幅值波动相较于间歇性闪络要小且相邻闪络间期变短,说明闪络引起表面灼烧通路更易于发生沿面闪络。
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| 关 键 词： | 三结合点 非介入式 表面电位 持续性闪络 仿真 |
| 收稿时间： | 2020/10/26 0:00:00 |
| 修稿时间： | 2021/3/17 0:00:00 |
Non-invasive surface potential measurement of surface flashover |
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| Authors: | FAN Lu GENG Yiwen WANG Yalin YIN Yi |
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| Affiliation: | School of Electronic Information and Electrical Engineering,Shanghai Jiao Tong University,Shanghai,School of Electronic Information and Electrical Engineering,Shanghai Jiao Tong University,Shanghai,State Grid Jiangsu Electric Power Co,Ltd Electric Power Research Institute,School of Electronic Information and Electrical Engineering,Shanghai Jiao Tong University,Shanghai,School of Electronic Information and Electrical Engineering,Shanghai Jiao Tong University,Shanghai |
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| Abstract: | Surface flashover is an important accident threating the safe operation of gas-insulated switchgear (GIS). Non-invasive surface potential measurement for flashover test device with finger-shape electrodes is proposed,and the feasibility of this device is analyzed by finite element software. The results show that non-invasive measurement error is 2.42% under simulation parameter settings in this paper. Surface potential of epoxy with nano-SiO2 mass fraction of 2% is measured using this device and the ascending applied voltage step is 0.5 kV/5 min. When the applied voltage is unable to induce flashover phenomenon,Maxwell-Wagner interface polarization caused by nanoparticle addition causes surface potential decay process. When the applied voltage approaches flashover voltage,surface potential presents periodic rise phenomenon in the decay process and the frequency of rise phenomenon becomes faster as the applied voltage higher. Periodic rise phenomenon in surface potential decay process before flashover can be used as a signal for predicting surface flashover. Fluctuation of surface potential in the continuous flashover process is smaller than that of intermittent flashover and the interval between adjacent flashover becomes shorter,which is related to the fact that surface burning path in the continuous flashover is prone to flashover. Surface potential measurement of DC flashover provides guidance for flashover prevention and flashover severity evaluation. |
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| Keywords: | three junction point non-invasive style surface potential continuous flashover simulation |
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