Research On Lightning Protection Performance Of 110kV Transmission Line In Hangzhou Area

Lightning is a natural disaster,Transmission lines erected on the field and in the high mountains,which is very easy to be struck by lightning.Transmission lines will be impacted by huge overvoltage and lightning current after being struck by lightning,which may cause the line tripping,the insulator string flashover,even will cause conductor,overhead ground wire broken,cause outage even cause blackout accident.Hangzhou is located in North of Zhejiang,Frequent tripping fault of Hangzhou electric power backbone network composed of 110 kV transmission lines caused by lightning,which has a great impact on the safe operation of power grid and power supply reliability.In this paper,the 110 kV overhead transmission lines by the city's power grid ray trip reasons are analyzed,and found the lightning tripping circuit characteristics and existing problems.By studying the principle of lightning discharge,transformation of lightning protection for the actual effect is analyzed,and a 110 kV post 57 line as the object,according to the operation data and the reality of,made a profound analysis of causes of lightning accident,considering running environment and to prevent double circuit line structure with jump problem,through differentiation,several measures for effective practice results have been achieved.Finally,from the Angle of the line operation management,puts forward the comprehensive lightning protection and reconstruction of 110 kV transmission line of the city's power grid.Hope that through this paper's shallow,can be engaged in transmission line design,operation and management of units to provide reference and reference.