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纳秒脉冲下变压器油两相流注放电仿真研究

王琪 王萌 王珏 严萍

王琪, 王萌, 王珏, 等. 纳秒脉冲下变压器油两相流注放电仿真研究[J]. 强激光与粒子束, 2020, 32: 025011. doi: 10.11884/HPLPB202032.190380
引用本文: 王琪, 王萌, 王珏, 等. 纳秒脉冲下变压器油两相流注放电仿真研究[J]. 强激光与粒子束, 2020, 32: 025011. doi: 10.11884/HPLPB202032.190380
Wang Qi, Wang Meng, Wang Jue, et al. Two-phase streamer characteristics in transformer oil under nanosecond impulses voltages[J]. High Power Laser and Particle Beams, 2020, 32: 025011. doi: 10.11884/HPLPB202032.190380
Citation: Wang Qi, Wang Meng, Wang Jue, et al. Two-phase streamer characteristics in transformer oil under nanosecond impulses voltages[J]. High Power Laser and Particle Beams, 2020, 32: 025011. doi: 10.11884/HPLPB202032.190380

纳秒脉冲下变压器油两相流注放电仿真研究

doi: 10.11884/HPLPB202032.190380
基金项目: 国家自然科学基金青年基金项目(51707185)
详细信息
    作者简介:

    王 琪(1985—),男,博士,从事高电压绝缘材料领域研究;wangqi@mail.iee.ac.cn

  • 中图分类号: TM315

Two-phase streamer characteristics in transformer oil under nanosecond impulses voltages

  • 摘要: 为揭示液体电介质击穿过程中形成的气体放电通道对液体电介质放电过程的影响,以针—板电极间隙变压器油为研究对象,基于等离子体流体力学模型,引入了液体电介质放电过程中气相放电通道对电离机制及自由电荷迁移率的影响,建立了用于模拟脉冲电压下液体电介质放电过程的两相流体模型,仿真研究了纳秒脉冲下针板电极流注放电的起始与发展过程。仿真结果表明:采用Heaviside方程可以在模型的不同区域同时实现气相物理过程和液相物理过程的模拟与计算。气相物理过程的引入导致流注尾部电场显著降低,流注头部电场进一步增强,使流注通道的发展速度要高于传统液相模型,有助于加深对纳秒脉冲下液体电介质中预击穿流注的起始、发展过程的认识和理解。
  • 图  1  针板形电极几何结构及其网格划分

    Figure  1.  Geometric structure of needle-plate electrode and its mesh generation

    图  2  200 kV正极性脉冲电压下气液两相介质模型与纯液体电介质流体模型的电场仿真结果对比

    Figure  2.  Comparison of two-phase model and ordinary fluid model electric field simulation results

    图  3  两相模型下变压器油在纳秒脉冲升压开始后40至80 ns期间沿针板电极中心轴的流注电场强度分布

    Figure  3.  Plot of electric field distribution along the needle-plane electrode axis given by the solution of the two-phase ionization model for t = 40 to 80 ns in intervals of 10 ns from the simulations in transformer oil

    图  4  两相模型下沿针板电极中心轴的液相与气相流注电场强度分布区分

    Figure  4.  Plot of electric field distribution along the needle-plane electrode axis given by the solution of the two-phase ionization model,showing the gas-phase and liquid-phase regions

    表  1  液相流注仿真所需主要物理参数

    Table  1.   Physical parameters required for simulation of liquid phase

    μpLP/(m2·V−1·s−1)μnLP/(m2·V−1·s−1)μeLP/(m2·V−1·s−1)Rpe/(m3·s−1Rpn/(m3·s−1n0/m−3a/mτa/sΔ/eV
    1×10−91×10−91×10−41.64×10−171.64×10−171×10233×10−102×10−77.5
    下载: 导出CSV

    表  2  变压器油传热参数

    Table  2.   Thermal parameters of transformer oil

    ρl/(kg·m−3)cv/(J·kg−1·K−1)kT/(W·m−1·K−1)
    8801.7×1030.13
    下载: 导出CSV

    表  3  气相流注通道仿真所需主要物理参数

    Table  3.   physical parameters required for simulation of gas phase

    μeGP/(m2·V−1·s−1)α0/m−1β0/(V·m−1)μpGP/(m2·V−1·s−1)μnGP/(m2·V−1·s−1)
    1×10−2252×1071×10−71×10−7
    下载: 导出CSV
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出版历程
  • 收稿日期:  2019-09-24
  • 修回日期:  2019-11-10
  • 刊出日期:  2019-12-26

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