Methods for risk assessment of old overhead transmission lines

Abstract

In view of the problem that the transmission line body elements are not considered comprehensively in the current evaluation methods of old transmission lines, this paper proposes a comprehensive risk assessment method for old overhead transmission lines based on practical operation experience. Firstly, the risk factors affecting the safe operation of the old overhead transmission lines were summarized. The pylons in the line segment were investigated item by item. All the hidden trouble points in the line segment were sorted out, and the risk value was calculated by danger source identification and risk assessment method. Secondly, according to the possibility of fault caused by technical factors on the old line, the weight coefficient is given to calculate the deduction value to judge the risk grade state. Finally, when the total deduction is greater than 60 points, or the single deduction is greater than 24 points, it is necessary to formulate a corresponding management plan to guide the orderly management of line hidden dangers.