考虑接地电阻特性影响的差异性杆塔接地设计

摘要

The design of overhead transmission line tower grounding system only considers relia-bility and the high standard of design,but it doesn't consider the lightning characteristics of transmission line and neglects the economy.This paper studied the causes and impacts of the high tower grounding resistance,and then simulated the lightening lines,it was found that the magni-tude of lightning current and voltage were both decreased along the power towers.Finally,the difference grounding tower design was proposed.The design guarantees the power grid reliability as well as improves the economic benefits of the electric power design.%目前架空输电线路杆塔接地体的设计，只考虑了可靠性与统一的高标准要求，忽略了经济性，且没有对输电线路雷击特性进行研究。基于此，提出考虑雷击电流及电压影响差异性的杆塔接地设计。首先，分析杆塔接地电阻过高的原因及其产生的影响；然后，仿真测试雷击输电线路，发现各级杆塔雷电流以及雷电过电压幅值逐步递减；最后，根据该特性，实现了对输电线路杆塔接地电阻差异性设计。该设计能够保障电网可靠运行，提高了电力设计的经济性。