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不同水分含量油浸纸板沿面放电发展过程及特性

吴广宁 周芃 高波 于瑞 胡广才

吴广宁, 周芃, 高波, 于瑞, 胡广才. 不同水分含量油浸纸板沿面放电发展过程及特性[J]. 西南交通大学学报, 2020, 55(3): 552-560. doi: 10.3969/j.issn.0258-2724.20190210
引用本文: 吴广宁, 周芃, 高波, 于瑞, 胡广才. 不同水分含量油浸纸板沿面放电发展过程及特性[J]. 西南交通大学学报, 2020, 55(3): 552-560. doi: 10.3969/j.issn.0258-2724.20190210
WU Guangning, ZHOU Peng, GAO Bo, YU Rui, HU Guangcai. Discharge Development and Characteristics of Oil-immersed Pressboard Surface with Different Moisture Contents[J]. Journal of Southwest Jiaotong University, 2020, 55(3): 552-560. doi: 10.3969/j.issn.0258-2724.20190210
Citation: WU Guangning, ZHOU Peng, GAO Bo, YU Rui, HU Guangcai. Discharge Development and Characteristics of Oil-immersed Pressboard Surface with Different Moisture Contents[J]. Journal of Southwest Jiaotong University, 2020, 55(3): 552-560. doi: 10.3969/j.issn.0258-2724.20190210

不同水分含量油浸纸板沿面放电发展过程及特性

doi: 10.3969/j.issn.0258-2724.20190210
基金项目: 国家重点研发计划(2017YFB0902704)
详细信息
    作者简介:

    吴广宁(1969—),男,教授,研究方向为高电压与绝缘技术,E-mail:gnwu@home.swjtu.edu.cn

Discharge Development and Characteristics of Oil-immersed Pressboard Surface with Different Moisture Contents

  • 摘要: 电力变压器内部水分增加将严重影响油纸绝缘性能,导致绝缘纸板表面更容易出现沿面放电故障. 为了研究交流电压下不同水分含量绝缘纸板的沿面放电特性,建立了典型的针板沿面放电模型. 基于脉冲电流法实时测量沿面放电模型的放电特征图谱,同时采用高速相机记录绝缘纸板上白斑形成和发展过程. 分析了不同水分含量纸板起始放电电压和闪络电压的变化趋势,以及沿面放电特征参数变化趋势. 分析结果表明:纸板含水量的增加导致起始放电电压显著降低;不同水分含量纸板的沿面放电和白斑形成发展过程均可划分为4个阶段,沿面放电过程和白斑形成发展的4个阶段存在一一对应关系;通过观察分析绝缘纸板微观结构,发现试验后的纸板纤维严重断裂,且纸板中水分含量越高,纸板表面受损害越严重,纸板含水量从小于0.5%增加到3.8%时,起始放电电压下降了61.3%.

     

  • 图 1  试验回路

    Figure 1.  Test circuit

    图 2  针板沿面放电模型结构图和实物图

    Figure 2.  Structure diagram and physical picture of needle board model

    图 3  局部放电特征参数随电压变化情况

    Figure 3.  Relationship between partial discharge characteristics and supply voltage

    图 4  针板沿面放电模型的局部放电四个阶段的PRPD图谱

    Figure 4.  PRPD patterns for four stages in needle board discharge model

    图 5  绝缘纸板上白斑形成发展过程

    Figure 5.  Formation and development of white mark on pressboard surface

    图 6  不同水分含量纸板试验后表面微观形貌(1 000倍放大)

    Figure 6.  Surface micrograph of pressboard with different water contents after tests (1 000 times)

    表  1  处理后变压器油各项参数

    Table  1.   Parameters of transformer oil after filtering

    属性指标实测值试验标准
    水分含量/
    ×10−6
    ≤ 30 14 GB/T 7600—2014
    击穿电压/kV ≥ 30 71 GB/T 507—2002
    介质损耗 ≤ 0.005 0 0.000 8 GB/T 5654—2007
    界面张力/
    (mN•m−1
    ≥ 40 46 GB/T 6541—1986
    酸值/(mg•g−1 ≤ 0.010 0 0.007 NB/SH/T 0836—2010
    下载: 导出CSV

    表  2  纸板水分含量对起始放电电压和闪络电压的影响

    Table  2.   Effect of moisture content in pressboard on initial discharge voltage and flashover voltage

    水分含量/%起始放电电压/kV闪络电压/kV
    平均值标准差平均值标准差
    < 0.5 31 1.91 63 0.48
    1.1 28 1.41 61 0.98
    1.5 23 2.33 59 0.33
    1.9 17 1.77 58 0.47
    2.4 14 1.64 57 0.28
    3.8 12 2.63 57 0.44
    下载: 导出CSV

    表  3  不同电压下纸板中水分含量对放电功率的影响

    Table  3.   Effect of moisture content in pressboard on discharge power under different voltages

    电压/kV水分含量/%放电功率/nW
    15 < 0.5 0
    1.1 0
    1.5 0
    1.9 0
    2.4 0
    3.8 467
    25 < 0.5 0
    1.1 0
    1.5 0
    1.9 1 221
    2.4 1 954
    3.8 2 650
    35 < 0.5 10 412
    1.1 12 530
    1.5 15 460
    1.9 17 235
    2.4 20 645
    3.8 21 930
    下载: 导出CSV
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出版历程
  • 收稿日期:  2019-04-02
  • 修回日期:  2019-06-09
  • 网络出版日期:  2019-09-16
  • 刊出日期:  2020-06-01

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