10 kV配电线路防雷研究

10 kV配电线路分布广泛,绝缘水平低,容易发生雷击事故。为了减少山西地区低压配电线路雷击故障,以山西某典型的10 kV线路为研究对象,基于ATP-EMTP仿真分析和一种改进的电气几何模型(EGM),计算该线路的雷击跳闸率,并根据风险评估标准对其进行风险评估。根据评估结果,有针对性地制定如下防雷改造措施:风险等级为B的34基杆塔下面装设冲击接地电阻;风险等级为C的14基杆塔上装设避雷器;风险等级为D的40号和102号杆塔同时装设避雷器和冲击接地电阻。

Research on Lightning Protection of 10 kV Distribution Line

The 10 kV distribution line is widely distributed and vulnerable to lightning faults for its low insulation level.In order to reduce the lightning faults of low-voltage distribution line in Shanxi,the lighting trip-out rate of a typical 10 k V distribution line in Shanxi is calculated based on ATP-EMTP simulation analysis and an improved electro-geometric model(EGM).And the assessment is completed based on the assessment criteria of lighting risk.The following lightning protection improvement measures are formulated specifically based on the assessment results:impulse grounding resistances are installed on 34 towers with risk grade B;lightning arresters are installed on 14 towers with risk grade C;impulse grounding resistances and lightning arresters are installed on towers 40 and 102 with risk grade D simultaneously.