110kV复合Ⅰ型绝缘子鸟粪闪络影响因素研究

Study on the influencing factors of guano flashover on 110kV type Ⅰ composite insulator

鸟粪闪络是架空输电线路涉鸟故障的主要形式之一,严重影响电网的运行可靠性。为明确不同因素对110 kV复合Ⅰ型绝缘子鸟粪闪络的影响情况,通过设计并搭建试验平台模拟鸟粪闪络试验,研究鸟粪粘度、电导率、有无均压环对鸟粪闪络的影响;通过电场仿真,研究鸟粪滴落路径对鸟粪闪络的影响。结果表明,在距离复合绝缘子大伞裙边沿15~21 cm情况下,鸟粪粘度越大,闪络概率越高,粘度相同,鸟粪电导率越大,闪络概率越高;复合绝缘子安装均压环比不安装时更易发生闪络;鸟粪平面与导线平面越靠近,临界闪络距离越大且不呈线性关系。

Guano flashover is one of the main faults involving birds in overhead transmission lines, which seriously affects the reliability of power grids. In order to determine the influences of different factors on the guano flashover of 110 kV type Ⅰ composite insulator, a test platform was designed and built to simulate bird dropping flashover test, and the influence of bird dropping viscosity, conductivity and whether or not there was a voltage equalizing ring on bird dropping flashover was studied. Through electric field simulation, the influence of birds dropping path on the guano flashover was studied. The results show that when the distance from the edge of the composite insulator shed is 15~21 cm, the greater the viscosity of bird manure is, the higher the flashover probability is. When the viscosity is the same,the greater the conductivity of the guano is, the higher the flashover probability is. Flashover is more likely to occur when voltage equalizing rings are installed than when those are not installed in the composite insulators. The closer the guano plane is to the wire plane, the larger the critical flashover distance is and there is no linear relationship.