基于线路杆塔冲击降阻效果的火花刺布置方式优化设计

Optimization Design of Arrangement Mode of Spark Thorn Based on Impulse Reduction Effect of Line Tower

鉴于改变线路杆塔接地装置的局部结构,加装针刺状短导体(也称火花刺)可有效降低其冲击接地电阻,建立多种加装火花刺结构的线路杆塔接地体模型进行仿真计算,分析火花刺布置方式的加装角度、分支位置及数量改变对冲击接地电阻的影响。结果表明,针刺导体间的电流屏蔽效应是影响火花刺降阻效果的主要因素,据此提出火花刺的优化布置方式。计算典型线路杆塔接地网模型加装火花刺的冲击降阻效果,其中以垂直方式加装24m火花刺能达到11.34%降阻率,为实际工程应用提供了参考。

Changing the local structure of the line tower grounding device,adding a needle-shaped short conductor(also called spark thorn)can effectively reduce its impulse grounding resistance.In this paper,a variety of grounding body models of line tower with spark thorn structure are built to perform simulation calculation.And then the influence of the installation angle of the spark thorn,the position and quantity of the branches on the impulse grounding resistance are analyzed.The research results show that the current shielding effect between the acupuncture conductors is the main factor affecting the reduction effect of spark thorn.According to this,the optimal arrangement of spark thorns is proposed.Finally,the impulse reduction effect of the typical line tower grounding grid model with sparks is calculated.Among them,adding the vertical 24 mspark thorns can achieve the 11.34%reduction rate,which can provide reference for the optimization design of the grounding grid in practical engineering applications.