LIGHTNING PROTECTION STRUCTURE OF OVERHEAD HIGH VOLTAGE TRANSMISSION LINE

摘要

A lightning protection structure of an overhead high voltage transmission line, consisting of a composite material cross arm (1), an energized conductor (2), a grounding conductor (3) and a discharging gap h; the energized conductor (2) is a straight metal tube with one end being secured to a tower (4); the grounding conductor (3) is a straight metal tube formed into an L shape with one end being secured on a high voltage terminal fitting of the composite material cross arm (1); the discharging gap h is formed between a suspended end of the energized conductor (2) and a suspended end of the grounding conductor (3); the composite material cross arm (1), the grounding conductor (3) and the energized conductor (2) are on the same plane, the plane being parallel to the horizontal plane, or the high voltage end tilts upward to form an angle not greater than 30° with the horizontal plane. The lightning protection structure can effectively avoid lightning accidents caused to the overhead high voltage transmission line, improve anti-pollution flashover, anti-icing flashover levels of the line, decrease the height of the towers, and reduce the width of line corridor, thus saving line construction costs.