| In this article,the influence factors of lightning protection level of high voltage transmission line and lightning protection measures,on the basis of the existing transmission line lightning protection research results,the lightning strikes the calculation of transmission line tower,through the calculation of lightning resisting level of transmission line,analysis on power system are how to improve the ability of transmission line protection,so as to effectively reduce the transmission line lightning trip-out rate,reduce the influence of the safety of power grid by lightning.Analysis process based on the electromagnetic transient program EMTP calculation,on the back flash over process calculation with transmission line towers,of Baotou power supply bureau 220 kV ShaCheng? ?? 65# ?67# tower,with double jump accident reappearance analysis,on the basis of model simulation study of various influence factors of the line with jump,lightning resisting level of calculation under different conditions of back,summed up with the changing rule of the jump performance,lightning protection modification measures are put forward.According to the climatic and topographic characteristics of Baotou,combined with typical lightning damage faults in recent years,the comprehensive design and application analysis of lightning protection for transmission lines are carried out.Electric geometry method is used to solve the lightning trip-out rate,according to transmission line corridors lightning activity,topography,line structure and insulation configuration,lightning protection measures,such as diversity,to ShaCheng ??? across the tower to fight back,detour lightning risk assessment,according to the result of risk assessment and combined with line existing lightning tripping accidents and line importance factors,and combining with the situation the tower is put forward to reduce grounding resistance,install the lightning rod of tower head and add the line measures such as retrofit scheme is determined.Through the observation of the actual operation of the line in the past five years,the lightning resistance level of the integrated transformation of the transmission line has been significantly improved,and the lightning failure in the section of the line vulnerable to lightning tripping has been effectively reduced,which has certain guiding significance for more comprehensive lightning protection measures in the later period. |
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