典型植被燃烧灰烬对导线-板间隙直流击穿特性的影响Influence of Typical Vegetation Ashes on DC Breakdown Characteristics of Conductor-Plane Air Gap
黄道春;卢威;阮江军;黎鹏;
摘要(Abstract):
架空输电线路通道内植被燃烧时会产生大量灰烬颗粒物,可显著降低输电线路导线—地空气间隙的绝缘强度。为研究直流电压下植被灰烬对输电线路空气间隙绝缘强度降低的影响机制,通过模拟植被燃烧试验平台,试验研究典型植被灰烬颗粒物对导线—板间隙直流电压击穿特性的影响,分析了颗粒链触发放电的机理。结果表明,3种植被中,茅草灰烬颗粒平均尺寸最大,重量最轻,对间隙绝缘强度影响最大;当间隙存在灰烬颗粒时,直流电压下间隙的绝缘强度大幅下降,负极性电压下,平均击穿电压梯度下降至纯空气间隙的29%;不同极性电压下植被燃烧灰烬颗粒物和间隙击穿特性存在明显差异,试验条件相同时,负极性电压下泄漏电流比正极性大。
关键词(KeyWords): 典型植被;灰烬;颗粒触发放电;直流击穿特性;极性效应
基金项目(Foundation): 国家自然科学基金面上项目(51677138)~~
作者(Author): 黄道春;卢威;阮江军;黎鹏;
Email:
DOI: 10.13335/j.1000-3673.pst.2018.0025
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