直流GIL中球形金属颗粒运动特性研究
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作者单位:

1.国网江苏省电力有限公司检修分公司;2.河海大学

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TM85

基金项目:

国家电网科技项目(J20200040);国家自然科学基金(51577050)


Kinetic Characteristic Analysis of Spherical Conducting Particle in DC GIL
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1.State Grid Jiangsu Electric Power CoLtd Maintenance Company;2.Hohai University

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    摘要:

    针对GIL中球形金属颗粒自由跳动造成严重绝缘故障的问题,在分析金属颗粒受力情况的基础上,搭建根据实际GIL设备等比例缩小的实验平台,拍摄和记录金属颗粒在腔体内的运动轨迹和起跳场强,进行多次重复性实验保证实验结果的一般性。实验结果表明:当金属颗粒材质一定时,球形颗粒的起跳场强主要由颗粒的半径决定,气体压强和电压极性对起跳场强几乎没有影响,随着颗粒数量的增加,起跳场强降低的幅度逐渐减少;球形颗粒在直流GIL中运动时可能出现伪谐振现象和围绕负电极徘徊运动的飞萤现象,颗粒半径越大,飞萤现象的概率就越高;球形颗粒在靠近绝缘子时,颗粒的起跳速度比在高压导体中部时更快;存在多个颗粒时,会出现颗粒分时起跳现象,整体的运动轨迹和单个颗粒的运动轨迹基本相似。

    Abstract:

    In order to solve the problem that serious insulation fault caused by free pulsation of spherical conducting particle in GIL, an experimental platform proportional shrunken according to GIL device was set up on the basis of analyzing the force of metal particles. The movement locus of metal particle and jumping field were observed and recorded. The generality of the experimental results were discussed through multiple repetitive experiments. The results indicate that particle jumping field is determined by the radius of the particles when the material is fixed, not relevant with the gas pressure and the voltage direction. The range of jumping field decreases gradually with the increase of the quantity of neighboring particles. The pseudo resonance phenomena and firefly phenomena may appear when spherical particle jumps in DC GIL, the probability of firefly phenomena increase with the increase of the particle radius. The jump rate is faster near the insulator than in the middle of the high voltage conductor;Multiple particles will cause the time-divided jumping phenomena and the movement locus is basically similar of the single particle.

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  • 收稿日期:2021-05-03
  • 最后修改日期:2021-06-21
  • 录用日期:2021-07-26
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