T接塔横担间距对电场分布影响的仿真研究

由于没有专门的设计规范,会造成T接塔在按照直线塔标准进行设计时塔头横担间距过大,电气安全余量过多,经济性不足。因此为T接塔的塔头电气安全余量,基于COMSOL Multiphysics软件,以实际工程中的某110 kV双回T接塔为研究对象进行建模。分析了T接塔两侧、带电作业工作点以及地面上1.5m处电场分布。研究结果表明,110kV双回T接塔在缩短横担间距后,T接塔的电场分布得到明显改善且均满足电气安全要求。在相对主线路方向电场更强且分布不均匀的T接线路侧,电场强度得到明显改善。T接塔塔头横担间距存在电气安全余量,可进一步优化。

Simulation Study on Influence of Cross Arm Spacing of T-connection Tower on Electric Field Distribution

Since there is no special design specification,it will cause too large cross arm spacing,too much electrical safety margin,and insufficient economy at the tower head when designing the T-connection tower according to the linear tower standard.In order to determine the electrical safety margin of the tower head of the T-connection tower,this paper takes a 110 kV double-circuit T-connection tower in the actual project as the research object for modeling,which is based on COMSOL multiphysics software.The electric field distribution on both sides of the T-connection tower,live working point and 1.5 m above the ground is analyzed.The research results show that after the 110 kV double-circuit,T-connection tower shortens the cross arm spacing,the electric field distribution of the T-connection tower is improved and all meet the electrical safety requirements.Moreover,the electric field intensity of T-connection lines with stronger electric field and uneven distribution relative to the main line direction is obviously improved.Research shows that there is an electrical safety margin for the cross arm spacing at the T-connection tower head,which can be further optimized.