Alternating current transmission line iron tower

Abstract

The invention discloses an alternating current transmission line iron tower which comprises a tower body and a cross arm at the top end of the tower body. The middle and the two ends of the lower side of the cross arm are each connected with a lightning-proof insulator. The lower ends of the lightning-proof insulators at the two ends are each connected with a side phase conductor. The lower end of the lightning-proof insulator in the middle is connected with a middle phase conductor. A compound fiber overhead ground wire is arranged on the waist of the tower body. The conductors are suspended on the lightning-proof insulators, so that the alternating current transmission line iron tower has the functions of suspension, insulation and lightning prevention at the same time. When ground lightning directly strikes the tower or the conductors, the lightning overvoltage will make the lightning-proof insulators move, impact energy is absorbed, the overvoltage is suppressed so as to protect the insulators against flashover, tripping of a transmission line is avoided, and power supply reliability is improved; the compound fiber overhead ground wire is located below the three phase conductors, so that the normal power communication function is achieved, the lightning overvoltage on the lightning-proof insulators can be decreased due to the coupling effect, the lightning-proof level is further improved, the lightning tripping frequency of the transmission line is effectively decreased, and the power supply reliability is improved.

Description

technical field [0001] The invention relates to an iron tower of an AC transmission line, in particular to a lightning protection structure of an iron tower of an AC transmission line. Background technique [0002] The power grid covers a wide area, and many transmission lines have to pass through areas where lightning is frequent. When encountering thunderstorms, lightning flashovers are likely to occur on transmission lines and cause trip accidents. Statistics show that the number of lightning trips on transmission lines exceeds 50% of the total trips, which is the biggest threat to the safe operation of the power grid. [0003] For lightning protection of transmission lines, the most commonly used method is to install overhead ground wires on iron towers. Its main function is to protect the wires below from being directly struck by lightning. The overhead ground wire needs to be installed on the dedicated ground wire bracket at the top of the tower. The ground wire supp...

AI Technical Summary

Problems solved by technology

The ground wire support not only needs to consume tower materials, but also in some cold areas may cause the ground wire support to break and be damaged due to the severe icing of the overhead ground wire in winter and is difficult to remove, causing power supply interruption

[0004] In recent years, the lightning protection method of installing line arresters and insulators in parallel with transmission line towers has also emerged. However, adding new line arresters requires adding new fixing devices to the original towers, and the existing line arresters are long in size and cannot meet the requirements of the tower window. There are disadvantages of difficulty in erection and high investment cost

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