Method for improving lightning protection capability of ultra- extra-high voltage transmission line

The invention relates to a method for improving the lightning protection capacity of a super or ultra high-voltage transmission line. Under the condition of no changing the original line pole tower and conducting wire type, two lightning protection line brackets are arranged on a middle-phase cross pole of the one-tower double-circuit super or ultra-high-voltage pole tower additionally, and two lightning protection lines are arranged on the brackets along the line additionally. Compared with the existing super or ultra high-voltage transmission line, the invention can improve the lightning protection capacity of the super or ultra high-voltage transmission line, and the cost of the newly added lightning protection line brackets and the lightning protection lines is only about 4 percent of the original total cost.