Lightning stroke-resistant optical fibre composite overhead ground wire

Abstract

The invention relates to a lightning stroke-resistant optical fibre composite overhead ground wire, which comprises aluminium-covered steel wires and an optical unit by taking a stainless steel tube as a sleeve, wherein the optical unit comprises an optical fibre; the optical fibre is in the stainless steel tube; the aluminium-covered steel wires and the optical unit form a layered stranded structure; the aluminium-covered steel wires comprise first aluminium-covered steel wires, second aluminium-covered steel wires and third aluminium-covered steel wires; the layered stranded structure comprises a central layer, a first layer and a second layer; the first aluminium-covered steel wires are in the central line; the first layer is composed of the second aluminium-covered steel wires and the optical unit; and the second layer has eleven third aluminium-covered steel wires. The lightning stroke-resistant optical fibre composite overhead ground wire disclosed by the invention is mainly used for constructing an optical fibre communication network of a power system and has the functions, such as lightning protection, flow division, optical fibre communication and the like, at the same time; furthermore, the lightning stroke-resistant optical fibre composite overhead ground wire has good lightning stroke-resistant performance and can be applied to areas with high thunderstorm.

Description

technical field [0001] The invention relates to an optical fiber composite overhead ground wire, in particular to a lightning-resistant optical fiber composite overhead ground wire. [0002] Background technique [0003] An overhead ground wire is a device that protects overhead transmission lines from lightning strikes. Also known as lightning protection line. The transmission line spans a vast area, and it is easy to be struck by lightning in the thunderstorm season, which will cause interruption of power transmission, which has become one of the main reasons for power outages in the power system. Installing overhead ground wires can reduce lightning accidents and improve the safety of line operation. The overhead ground wire is an important part of the high voltage transmission line structure. High-voltage and ultra-high-voltage substations occupy a large area, requiring a large area for direct lightning protection, and it will be difficult to install lightning rods. ...

AI Technical Summary

Problems solved by technology

[0005] The outer metal wire in the optical fiber composite overhead ground wire is often made of aluminum alloy wire. The melting point of aluminum alloy is low, and it is easy to be blown when struck by lightning. Layer aluminum alloy wire breaks, affecting the use of optical fiber composite overhead ground wires, and poses a serious threat to UHV transmission lines and power communications. It often adopts a 1+6+12 twisting method, that is, the center layer is an aluminum-clad Steel wires, the first layer is composed of six aluminum-clad steel wires and light units, the second layer is twelve aluminum alloy wires, the first layer is twisted and wrapped on the center layer, and the second layer is twisted and wrapped on the second layer On the first layer; because it is necessary to ensure that the strands are not loose and not too tight when twisting, when the optical unit is the same, the diameter of the aluminum alloy wire on the second layer is smaller when this structure is adopted, so the resistance is larger, and it is struck by lightning At the time, a large current will flow through the aluminum alloy wire, which will generate a lot of heat. At the same time, the tensile strength and melting point of the aluminum alloy wire are lower than that of the aluminum-clad steel wire. When it is frequently struck by lightning, it will cause The outermost aluminum alloy wire is aging or even melting, which affects the use of optical fiber composite overhead ground wire and poses a serious threat to UHV transmission lines and power communication

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