JPH0592914U - Lightning-proof overhead ground wire - Google Patents

Abstract

(57) [Summary] [Structure] A plurality of conductive metal element wires constituting the outermost layer of the ground wire are twisted at intervals with each other, and a melting loss layer is provided on the outermost layer. A lightning-resistant overhead ground wire was constructed by filling a non-combustible or self-extinguishing filler in the void formed between the outermost layer and the outermost layer. [Effect] There is no possibility that the wire rod of the outermost layer of the ground wire is biased due to the resistance of the gold wheel when the lightning-resistant overhead ground wire is extended, and the erosion layer is crushed and the lightning resistance effect is impaired. In addition, when there is a lightning strike on the lightning-resistant overhead ground wire, the erosion layer is damaged by the arc energy, but the arc energy is relieved by the damage of the erosion layer, and the filler filled in the voids is the thermal buffer layer. And damage to the ground line is minimized.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a lightning-resistant overhead ground wire.

[0002]

[Prior Art]

 Conventionally, overhead ground wires have been used to prevent damage to transmission lines due to arc energy caused by lightning and also to prevent electromagnetic interference. Further, in recent years, with the advent of the compound overhead ground wire (0PGW), the overhead ground wire plays a role as an information transmission line, and the importance thereof is dramatically increasing.

A ground wire and a melt-dissipation layer provided on the ground wire as an overhead ground wire which prevents the above-mentioned damage to the power transmission line due to lightning stroke and electromagnetic interference and also functions as an information transmission path. A lightning-resistant overhead ground wire is known in which a void portion having high heat insulation properties is provided between the two.

[0004]

[Problems to be solved by the device]

 As described above, a lightning-resistant overhead ground wire constructed by providing a void portion between the ground wire and the melt-damaged layer provided thereon has excellent lightning resistance characteristics, but on the other hand, it has a problem in mechanical strength. is there.

That is, when the passing test is carried out by a gold wheel, a bias phenomenon of the outermost wire of the ground wire forming voids occurs, the melt-damage layer is crushed, and further, the melt-damage layer adheres to the inner wire. It will not be possible to obtain sufficient lightning protection.

The present invention has been made in view of the above problems, and an object thereof is to provide a lightning resistant overhead ground wire having excellent lightning resistance characteristics and mechanical characteristics.

[0007]

[Means for Solving the Problems]

 The present invention relates to a lightning protection overhead ground wire in which a void is formed between a ground wire and a melt-damage layer provided on the ground wire, and the void is filled with a non-combustible or self-extinguishing filler material to prevent lightning. An overhead ground wire is constructed to solve the conventional problems.

[0008]

[Action]

 The ground wire prevents arc melting and disconnection due to lightning strikes of the transmission line, prevents electromagnetic induction damage, and functions as an information transmission line.

The non-combustible or self-extinguishing filling material filled in the void formed between the ground wire and the melt-damaged layer prevents the strands forming the void from being biased, and also has thermal energy. Acts as a thermal buffer layer that makes it difficult to transfer to the ground line.

The melting layer prevents arc loss due to lightning from reaching the ground line. That is, the lightning strike damages the erosion layer, but at this time, the arc energy is relaxed, and a non-combustible or self-extinguishing property that acts as a thermal buffer layer between the ground wire and the erosion layer. Since the above filling material is filled, damage to the ground wire due to lightning is minimized.

[0011]

【Example】

 Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a cross-sectional view showing an embodiment of the present invention. In the figure, 1 is a composite overhead ground wire (0PGW), 2 is a metal pipe constituting the composite overhead ground wire 1, 3 is aluminum on the metal pipe 2. Inner layer 4 in which conductive metal element wires such as coated steel wires are tightly twisted together is provided with a plurality of large-diameter conductive metal element wires such as aluminum coated steel wires on the inner layer 3 with a space between each other. It is the outermost layer that is twisted. Reference numeral 5 denotes a erosion layer, and the erosion layer 5 is provided on the outermost layer 4 of the above-mentioned composite overhead ground wire 1 by tightly twisting conductive metal element wires having a fan-shaped cross section. 6 is a void portion formed between the erosion layer 5 and the strand of the outermost layer 4 of the ground wire 1. Reference numeral 7 is a non-combustible or self-extinguishing filler made of glass fiber, epoxy resin, plastic, silicone rubber or the like filled in the void portion 6.

As described above, the present invention in which the non-combustible or self-extinguishing filler 7 is filled in the void portion 6 formed between the melting layer 5 and the wire of the outermost layer 4 of the ground wire 1. As a result of conducting a gold car passing test, a cam-along test, etc. on the lightning-resistant overhead ground wire of No. 3, there is no deviation in the strands of the outermost layer 4 and the erosion layer 5 is not crushed. It was no different from the ground line.

Next, as a result of performing an arc resistance test, the erosion layer 5 is damaged by the arc energy, but the arc energy is relaxed by the damage of the erosion layer 5, and the filling filled in the void portion 6 is performed. Material 7 acts as a heat buffer layer, damage to the ground wire 1 is minimized, and it is equivalent to a conventional lightning protection overhead ground wire in which a void is formed between the ground wire and the melt-damage layer provided on the ground wire. The lightning protection effect was obtained.

Although the composite overhead ground wire (0PGW) has been illustrated and described above, the present invention is not limited to this, and it goes without saying that the present invention can be applied to ground wires other than the composite overhead ground wire. Is.

[0015]

[Effect of the device]

 According to the present invention, as described above, there is an excellent advantage that it is possible to provide a lightning-resistant overhead ground wire which is excellent in lightning-proof characteristics and has no fear of impairing the lightning-proof effect during wire extension.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing an embodiment of the present invention.

[Explanation of symbols]

1 compound overhead ground wire
4 Outermost layer 5 Melt loss layer
6 Gap 7 Filler

Claims (1)

[Scope of utility model registration request] 1. A lightning-resistant overhead ground wire having a void portion formed between the ground wire and a melt-damage layer provided thereon, wherein the void portion is filled with a non-combustible or self-extinguishing filler. Lightning-proof overhead ground wire.